/proc/dynamic_debug/control walks the prdbg catalog in "reverse",
fix this by adding new ddebug_tables to tail of list.
This puts init/main.c entries 1st, which looks more than coincidental.
no functional changes.
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-5-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
print "old => new" flag values to the info("change") message.
no functional change.
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-4-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
For CONFIG_DYNAMIC_DEBUG=N, the ddebug_dyndbg_module_param_cb()
stub-fn is too permissive:
bash-5.1# modprobe drm JUNKdyndbg
bash-5.1# modprobe drm dyndbgJUNK
[ 42.933220] dyndbg param is supported only in CONFIG_DYNAMIC_DEBUG builds
[ 42.937484] ACPI: bus type drm_connector registered
This caused no ill effects, because unknown parameters are either
ignored by default with an "unknown parameter" warning, or ignored
because dyndbg allows its no-effect use on non-dyndbg builds.
But since the code has an explicit feedback message, it should be
issued accurately. Fix with strcmp for exact param-name match.
Fixes: b48420c1d3 dynamic_debug: make dynamic-debug work for module initialization
Reported-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-3-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In https://lore.kernel.org/lkml/20211209150910.GA23668@axis.com/
Vincent's patch commented on, and worked around, a bug toggling
static_branch's, when a 2nd PRINTK-ish flag was added. The bug
results in a premature static_branch_disable when the 1st of 2 flags
was disabled.
The cited commit computed newflags, but then in the JUMP_LABEL block,
failed to use that result, instead using just one of the terms in it.
Using newflags instead made the code work properly.
This is Vincents test-case, reduced. It needs the 2nd flag to
demonstrate the bug, but it's explanatory here.
pt_test() {
echo 5 > /sys/module/dynamic_debug/verbose
site="module tcp" # just one callsite
echo " $site =_ " > /proc/dynamic_debug/control # clear it
# A B ~A ~B
for flg in +T +p "-T #broke here" -p; do
echo " $site $flg " > /proc/dynamic_debug/control
done;
# A B ~B ~A
for flg in +T +p "-p #broke here" -T; do
echo " $site $flg " > /proc/dynamic_debug/control
done
}
pt_test
Fixes: 84da83a6ff dyndbg: combine flags & mask into a struct, simplify with it
CC: vincent.whitchurch@axis.com
Acked-by: Jason Baron <jbaron@akamai.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Link: https://lore.kernel.org/r/20220904214134.408619-2-jim.cromie@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
If the gfp flag used for the memory allocation already has __GFP_ZERO,
then there is no need to explicitly clear the "struct devres_node". It is
already zeroed.
This saves a few cycles when using devm_zalloc() and co.
In the case of devres_alloc() (which calls __devres_alloc_node()), the
compiler could remove the test and the memset() because it should be able
to see that the __GFP_ZERO flag is set.
So this would make the code both faster and smaller.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/d255bd871484e63cdd628e819f929e2df59afb02.1658352383.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add cgroup_file_show() which allows toggling visibility of a cgroup file
using the new kernfs_show(). This will be used to hide psi interface files
on cgroups where it's disabled.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-10-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Currently, kernfs nodes can be created hidden and activated later by calling
kernfs_activate() to allow creation of multiple nodes to succeed or fail as
a unit. This is an one-way one-time-only transition. This patch introduces
kernfs_show() which can toggle visibility dynamically.
As the currently proposed use - toggling the cgroup pressure files - only
requires operating on leaf nodes, for the sake of simplicity, restrict it as
such for now.
Hiding uses the same mechanism as deactivation and likewise guarantees that
there are no in-flight operations on completion. KERNFS_ACTIVATED and
KERNFS_HIDDEN are used to manage the interactions between activations and
show/hide operations. A node is visible iff both activated & !hidden.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-9-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Factor out kernfs_activate_one() from kernfs_activate() and reorder
operations so that KERNFS_ACTIVATED now simply indicates whether activation
was attempted on the node ignoring whether activation took place. As the
flag doesn't have a reader, the refactoring and reordering shouldn't cause
any behavior difference.
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-8-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
KERNFS_ACTIVATED tracks whether a given node has ever been activated. As a
node was only deactivated on removal, this was used for
1. Drain optimization (removed by the previous patch).
2. To hide !activated nodes
3. To avoid double activations
4. Reject adding children to a node being removed
5. Skip activaing a node which is being removed.
We want to decouple deactivation from removal so that nodes can be
deactivated and hidden dynamically, which makes KERNFS_ACTIVATED useless for
all of the above purposes.
#1 is already gone. #2 and #3 can instead test whether the node is currently
active. A new flag KERNFS_REMOVING is added to explicitly mark nodes which
are being removed for #4 and #5.
While this leaves KERNFS_ACTIVATED with no users, leave it be as it will be
used in a following patch.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-7-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
__kernfs_remove() was skipping draining based on KERNFS_ACTIVATED - whether
the node has ever been activated since creation. Instead, update it to
always call kernfs_drain() which now drains or skips based on the precise
drain conditions. This ensures that the nodes will be deactivated and
drained regardless of their states.
This doesn't make meaningful difference now but will enable deactivating and
draining nodes dynamically by making removals safe when racing those
operations.
While at it, drop / update comments.
v2: Fix the inverted test on kernfs_should_drain_open_files() noted by
Chengming. This was fixed by the next unrelated patch in the previous
posting.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-6-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Track the number of mmapped files and files that need to be released and
skip kernfs_drain_open_file() if both are zero, which are the precise
conditions which require draining open_files. The early exit test is
factored into kernfs_should_drain_open_files() which is now tested by
kernfs_drain_open_files()'s caller - kernfs_drain().
This isn't a meaningful optimization on its own but will enable future
stand-alone kernfs_deactivate() implementation.
v2: Chengming noticed that on->nr_to_release was leaking after ->open()
failure. Fix it by telling kernfs_unlink_open_file() that it's called
from the ->open() fail path and should dec the counter. Use kzalloc() to
allocate kernfs_open_node so that the tracking fields are correctly
initialized.
Cc: Chengming Zhou <zhouchengming@bytedance.com>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-5-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Factor out commont part. This is cleaner and should help with future
changes. No functional changes.
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-4-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
kernfs_node->attr.open is an RCU pointer to kernfs_open_node. However, RCU
dereference is currently only used in kernfs_notify(). Everywhere else,
either we're holding the lock which protects it or know that the
kernfs_open_node is pinned becaused we have a pointer to a kernfs_open_file
which is hanging off of it.
kernfs_deref_open_node() is used for the latter case - accessing
kernfs_open_node from kernfs_open_file. The lifetime and visibility rules
are simple and clear here. To someone who can access a kernfs_open_file, its
kernfs_open_node is pinned and visible through of->kn->attr.open.
Replace kernfs_deref_open_node() which simpler of_on(). The former takes
both @kn and @of and RCU deref @kn->attr.open while sanity checking with
@of. The latter takes @of and uses protected deref on of->kn->attr.open.
As the return value can't be NULL, remove the error handling in the callers
too.
This shouldn't cause any functional changes.
Cc: Imran Khan <imran.f.khan@oracle.com>
Tested-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Chengming Zhou <zhouchengming@bytedance.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20220828050440.734579-2-tj@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
devm_ioremap_np has never been used anywhere since it was added in early
2021, so remove it.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220822061424.151819-1-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
installed at such instructions, possibly resulting in
incorrect execution (the wrong branch taken).
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-urgent-2022-08-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 kprobes fix from Ingo Molnar:
"Fix a kprobes bug in JNG/JNLE emulation when a kprobe is installed at
such instructions, possibly resulting in incorrect execution (the
wrong branch taken)"
* tag 'perf-urgent-2022-08-21' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/kprobes: Fix JNG/JNLE emulation
- Fix a return value of traceprobe_parse_event_name()
- Fix NULL pointer dereference from failed ftrace enabling
- Fix NULL pointer dereference when asking for registers from eprobes
- Make eprobes consistent with kprobes/uprobes, filters and histograms
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Merge tag 'trace-v6.0-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fixes from Steven Rostedt:
"Various fixes for tracing:
- Fix a return value of traceprobe_parse_event_name()
- Fix NULL pointer dereference from failed ftrace enabling
- Fix NULL pointer dereference when asking for registers from eprobes
- Make eprobes consistent with kprobes/uprobes, filters and
histograms"
* tag 'trace-v6.0-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Have filter accept "common_cpu" to be consistent
tracing/probes: Have kprobes and uprobes use $COMM too
tracing/eprobes: Have event probes be consistent with kprobes and uprobes
tracing/eprobes: Fix reading of string fields
tracing/eprobes: Do not hardcode $comm as a string
tracing/eprobes: Do not allow eprobes to use $stack, or % for regs
ftrace: Fix NULL pointer dereference in is_ftrace_trampoline when ftrace is dead
tracing/perf: Fix double put of trace event when init fails
tracing: React to error return from traceprobe_parse_event_name()
Make filtering consistent with histograms. As "cpu" can be a field of an
event, allow for "common_cpu" to keep it from being confused with the
"cpu" field of the event.
Link: https://lkml.kernel.org/r/20220820134401.513062765@goodmis.org
Link: https://lore.kernel.org/all/20220820220920.e42fa32b70505b1904f0a0ad@kernel.org/
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 1e3bac71c5 ("tracing/histogram: Rename "cpu" to "common_cpu"")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Both $comm and $COMM can be used to get current->comm in eprobes and the
filtering and histogram logic. Make kprobes and uprobes consistent in this
regard and allow both $comm and $COMM as well. Currently kprobes and
uprobes only handle $comm, which is inconsistent with the other utilities,
and can be confusing to users.
Link: https://lkml.kernel.org/r/20220820134401.317014913@goodmis.org
Link: https://lore.kernel.org/all/20220820220442.776e1ddaf8836e82edb34d01@kernel.org/
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 533059281e ("tracing: probeevent: Introduce new argument fetching code")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Currently, if a symbol "@" is attempted to be used with an event probe
(eprobes), it will cause a NULL pointer dereference crash.
Both kprobes and uprobes can reference data other than the main registers.
Such as immediate address, symbols and the current task name. Have eprobes
do the same thing.
For "comm", if "comm" is used and the event being attached to does not
have the "comm" field, then make it the "$comm" that kprobes has. This is
consistent to the way histograms and filters work.
Link: https://lkml.kernel.org/r/20220820134401.136924220@goodmis.org
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 7491e2c442 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Currently when an event probe (eprobe) hooks to a string field, it does
not display it as a string, but instead as a number. This makes the field
rather useless. Handle the different kinds of strings, dynamic, static,
relational/dynamic etc.
Now when a string field is used, the ":string" type can be used to display
it:
echo "e:sw sched/sched_switch comm=$next_comm:string" > dynamic_events
Link: https://lkml.kernel.org/r/20220820134400.959640191@goodmis.org
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 7491e2c442 ("tracing: Add a probe that attaches to trace events")
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
The variable $comm is hard coded as a string, which is true for both
kprobes and uprobes, but for event probes (eprobes) it is a field name. In
most cases the "comm" field would be a string, but there's no guarantee of
that fact.
Do not assume that comm is a string. Not to mention, it currently forces
comm fields to fault, as string processing for event probes is currently
broken.
Link: https://lkml.kernel.org/r/20220820134400.756152112@goodmis.org
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 7491e2c442 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
If in perf_trace_event_init(), the perf_trace_event_open() fails, then it
will call perf_trace_event_unreg() which will not only unregister the perf
trace event, but will also call the put() function of the tp_event.
The problem here is that the trace_event_try_get_ref() is called by the
caller of perf_trace_event_init() and if perf_trace_event_init() returns a
failure, it will then call trace_event_put(). But since the
perf_trace_event_unreg() already called the trace_event_put() function, it
triggers a WARN_ON().
WARNING: CPU: 1 PID: 30309 at kernel/trace/trace_dynevent.c:46 trace_event_dyn_put_ref+0x15/0x20
If perf_trace_event_reg() does not call the trace_event_try_get_ref() then
the perf_trace_event_unreg() should not be calling trace_event_put(). This
breaks symmetry and causes bugs like these.
Pull out the trace_event_put() from perf_trace_event_unreg() and call it
in the locations that perf_trace_event_unreg() is called. This not only
fixes this bug, but also brings back the proper symmetry of the reg/unreg
vs get/put logic.
Link: https://lore.kernel.org/all/cover.1660347763.git.kjlx@templeofstupid.com/
Link: https://lkml.kernel.org/r/20220816192817.43d5e17f@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 1d18538e6a ("tracing: Have dynamic events have a ref counter")
Reported-by: Krister Johansen <kjlx@templeofstupid.com>
Reviewed-by: Krister Johansen <kjlx@templeofstupid.com>
Tested-by: Krister Johansen <kjlx@templeofstupid.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
The function traceprobe_parse_event_name() may set the first two function
arguments to a non-null value and still return -EINVAL to indicate an
unsuccessful completion of the function. Hence, it is not sufficient to
just check the result of the two function arguments for being not null,
but the return value also needs to be checked.
Commit 95c104c378 ("tracing: Auto generate event name when creating a
group of events") changed the error-return-value checking of the second
traceprobe_parse_event_name() invocation in __trace_eprobe_create() and
removed checking the return value to jump to the error handling case.
Reinstate using the return value in the error-return-value checking.
Link: https://lkml.kernel.org/r/20220811071734.20700-1-lukas.bulwahn@gmail.com
Fixes: 95c104c378 ("tracing: Auto generate event name when creating a group of events")
Acked-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
merge window and a fix for proper error handling in the remove path of
the iMX driver.
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Merge tag 'i2c-for-6.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang:
"A revert to fix a regression introduced this merge window and a fix
for proper error handling in the remove path of the iMX driver"
* tag 'i2c-for-6.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: imx: Make sure to unregister adapter on remove()
Revert "i2c: scmi: Replace open coded device_get_match_data()"
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Merge tag '6.0-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs client fixes from Steve French:
- memory leak fix
- two small cleanups
- trivial strlcpy removal
- update missing entry for cifs headers in MAINTAINERS file
* tag '6.0-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
cifs: move from strlcpy with unused retval to strscpy
cifs: Fix memory leak on the deferred close
cifs: remove useless parameter 'is_fsctl' from SMB2_ioctl()
cifs: remove unused server parameter from calc_smb_size()
cifs: missing directory in MAINTAINERS file
GCC has supported asm goto since 4.5, and Clang has since version 9.0.0.
The minimum supported versions of these tools for the build according to
Documentation/process/changes.rst are 5.1 and 11.0.0 respectively.
Remove the feature detection script, Kconfig option, and clean up some
fallback code that is no longer supported.
The removed script was also testing for a GCC specific bug that was
fixed in the 4.7 release.
Also remove workarounds for bpftrace using clang older than 9.0.0, since
other BPF backend fixes are required at this point.
Link: https://lore.kernel.org/lkml/CAK7LNATSr=BXKfkdW8f-H5VT_w=xBpT2ZQcZ7rm6JfkdE+QnmA@mail.gmail.com/
Link: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637
Acked-by: Borislav Petkov <bp@suse.de>
Suggested-by: Masahiro Yamada <masahiroy@kernel.org>
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
If for whatever reasons pm_runtime_resume_and_get() fails and .remove() is
exited early, the i2c adapter stays around and the irq still calls its
handler, while the driver data and the register mapping go away. So if
later the i2c adapter is accessed or the irq triggers this results in
havoc accessing freed memory and unmapped registers.
So unregister the software resources even if resume failed, and only skip
the hardware access in that case.
Fixes: 588eb93ea4 ("i2c: imx: add runtime pm support to improve the performance")
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
- Fix module versioning broken on some architectures
- Make dummy-tools enable CONFIG_PPC_LONG_DOUBLE_128
- Remove -Wformat-zero-length, which has no warning instance
- Fix the order between drivers and libs in modules.order
- Fix false-positive warnings in clang-analyzer
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Merge tag 'kbuild-fixes-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Fix module versioning broken on some architectures
- Make dummy-tools enable CONFIG_PPC_LONG_DOUBLE_128
- Remove -Wformat-zero-length, which has no warning instance
- Fix the order between drivers and libs in modules.order
- Fix false-positive warnings in clang-analyzer
* tag 'kbuild-fixes-v6.0' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
scripts/clang-tools: Remove DeprecatedOrUnsafeBufferHandling check
kbuild: fix the modules order between drivers and libs
scripts/Makefile.extrawarn: Do not disable clang's -Wformat-zero-length
kbuild: dummy-tools: pretend we understand __LONG_DOUBLE_128__
modpost: fix module versioning when a symbol lacks valid CRC
- Fix alignment for cpu map masks in event encoding.
- Support reading PERF_FORMAT_LOST, perf tool counterpart for a feature
that was added in this merge window.
- Sync perf tools copies of kernel headers: socket, msr-index, fscrypt,
cpufeatures, i915_drm, kvm, vhost, perf_event.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Merge tag 'perf-tools-fixes-for-v6.0-2022-08-19' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux
Pull perf tools fixes from Arnaldo Carvalho de Melo:
- Fix alignment for cpu map masks in event encoding.
- Support reading PERF_FORMAT_LOST, perf tool counterpart for a feature
that was added in this merge window.
- Sync perf tools copies of kernel headers: socket, msr-index, fscrypt,
cpufeatures, i915_drm, kvm, vhost, perf_event.
* tag 'perf-tools-fixes-for-v6.0-2022-08-19' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
perf tools: Support reading PERF_FORMAT_LOST
libperf: Add a test case for read formats
libperf: Handle read format in perf_evsel__read()
tools headers UAPI: Sync linux/perf_event.h with the kernel sources
tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources
tools headers UAPI: Sync KVM's vmx.h header with the kernel sources
tools include UAPI: Sync linux/vhost.h with the kernel sources
tools headers kvm s390: Sync headers with the kernel sources
tools headers UAPI: Sync linux/kvm.h with the kernel sources
tools headers UAPI: Sync drm/i915_drm.h with the kernel sources
tools headers cpufeatures: Sync with the kernel sources
tools headers UAPI: Sync linux/fscrypt.h with the kernel sources
tools arch x86: Sync the msr-index.h copy with the kernel sources
perf beauty: Update copy of linux/socket.h with the kernel sources
perf cpumap: Fix alignment for masks in event encoding
perf cpumap: Compute mask size in constant time
perf cpumap: Synthetic events and const/static
perf cpumap: Const map for max()
- Fix a KVM crash on z12 and older machines caused by a wrong
assumption that Query AP Configuration Information is always
available.
- Lower severity of excessive Hypervisor filesystem error messages
when booting under KVM.
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Merge tag 's390-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 updates from Alexander Gordeev:
- Fix a KVM crash on z12 and older machines caused by a wrong
assumption that Query AP Configuration Information is always
available.
- Lower severity of excessive Hypervisor filesystem error messages
when booting under KVM.
* tag 's390-6.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/ap: fix crash on older machines based on QCI info missing
s390/hypfs: avoid error message under KVM
- Fix atomic sleep warnings at boot due to get_phb_number() taking a mutex with a
spinlock held on some machines.
- Add missing PMU selftests to .gitignores.
Thanks to: Guenter Roeck, Russell Currey.
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Merge tag 'powerpc-6.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- Fix atomic sleep warnings at boot due to get_phb_number() taking a
mutex with a spinlock held on some machines.
- Add missing PMU selftests to .gitignores.
Thanks to Guenter Roeck and Russell Currey.
* tag 'powerpc-6.0-3' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
selftests/powerpc: Add missing PMU selftests to .gitignores
powerpc/pci: Fix get_phb_number() locking
A few minor fixes:
- Fix buffer management in SRP to correct a regression with the login
authentication feature from v5.17
- Don't iterate over non-present ports in mlx5
- Fix an error introduced by the foritify work in cxgb4
- Two bug fixes for the recently merged ERDMA driver
- Unbreak RDMA dmabuf support, a regresion from v5.19
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
Pull rdma fixes from Jason Gunthorpe:
"A few minor fixes:
- Fix buffer management in SRP to correct a regression with the login
authentication feature from v5.17
- Don't iterate over non-present ports in mlx5
- Fix an error introduced by the foritify work in cxgb4
- Two bug fixes for the recently merged ERDMA driver
- Unbreak RDMA dmabuf support, a regresion from v5.19"
* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma:
RDMA: Handle the return code from dma_resv_wait_timeout() properly
RDMA/erdma: Correct the max_qp and max_cq capacities of the device
RDMA/erdma: Using the key in FMR WR instead of MR structure
RDMA/cxgb4: fix accept failure due to increased cpl_t5_pass_accept_rpl size
RDMA/mlx5: Use the proper number of ports
IB/iser: Fix login with authentication
This `clang-analyzer` check flags the use of memset(), suggesting a more
secure version of the API, such as memset_s(), which does not exist in
the kernel:
warning: Call to function 'memset' is insecure as it does not provide
security checks introduced in the C11 standard. Replace with analogous
functions that support length arguments or provides boundary checks such
as 'memset_s' in case of C11
[clang-analyzer-security.insecureAPI.DeprecatedOrUnsafeBufferHandling]
Signed-off-by: Guru Das Srinagesh <quic_gurus@quicinc.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Commit b2c8855491 ("kbuild: update modules.order only when contained
modules are updated") accidentally changed the modules order.
Prior to that commit, the modules order was determined based on
vmlinux-dirs, which lists core-y/m, drivers-y/m, libs-y/m, in this order.
Now, subdir-modorder lists them in a different order: core-y/m, libs-y/m,
drivers-y/m.
Presumably, there was no practical issue because the modules in drivers
and libs are orthogonal, but there is no reason to have this distortion.
Get back to the original order.
Fixes: b2c8855491 ("kbuild: update modules.order only when contained modules are updated")
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
There are no instances of this warning in the tree across several
difference architectures and configurations. This was added by
commit 26ea6bb1fe ("kbuild, LLVMLinux: Supress warnings unless W=1-3")
back in 2014, where it might have been necessary, but there are no
instances of it now so stop disabling it to increase warning coverage
for clang.
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
There is a test in powerpc's Kconfig which checks __LONG_DOUBLE_128__
and sets CONFIG_PPC_LONG_DOUBLE_128 if it is understood by the compiler.
We currently don't handle it, so this results in PPC_LONG_DOUBLE_128 not
being in super-config generated by dummy-tools. So take this into
account in the gcc script and preprocess __LONG_DOUBLE_128__ as "1".
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Since commit 7b4537199a ("kbuild: link symbol CRCs at final link,
removing CONFIG_MODULE_REL_CRCS"), module versioning is broken on
some architectures. Loading a module fails with "disagrees about
version of symbol module_layout".
On such architectures (e.g. ARCH=sparc build with sparc64_defconfig),
modpost shows a warning, like follows:
WARNING: modpost: EXPORT symbol "_mcount" [vmlinux] version generation failed, symbol will not be versioned.
Is "_mcount" prototyped in <asm/asm-prototypes.h>?
Previously, it was a harmless warning (CRC check was just skipped),
but now wrong CRCs are used for comparison because invalid CRCs are
just skipped.
$ sparc64-linux-gnu-nm -n vmlinux
[snip]
0000000000c2cea0 r __ksymtab__kstrtol
0000000000c2ceb8 r __ksymtab__kstrtoul
0000000000c2ced0 r __ksymtab__local_bh_enable
0000000000c2cee8 r __ksymtab__mcount
0000000000c2cf00 r __ksymtab__printk
0000000000c2cf18 r __ksymtab__raw_read_lock
0000000000c2cf30 r __ksymtab__raw_read_lock_bh
[snip]
0000000000c53b34 D __crc__kstrtol
0000000000c53b38 D __crc__kstrtoul
0000000000c53b3c D __crc__local_bh_enable
0000000000c53b40 D __crc__printk
0000000000c53b44 D __crc__raw_read_lock
0000000000c53b48 D __crc__raw_read_lock_bh
Please notice __crc__mcount is missing here.
When the module subsystem looks up a CRC that comes after, it results
in reading out a wrong address. For example, when __crc__printk is
needed, the module subsystem reads 0xc53b44 instead of 0xc53b40.
All CRC entries must be output for correct index accessing. Invalid
CRCs will be unused, but are needed to keep the one-to-one mapping
between __ksymtab_* and __crc_*.
The best is to fix all modpost warnings, but several warnings are still
remaining on less popular architectures.
Fixes: 7b4537199a ("kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS")
Reported-by: matoro <matoro_mailinglist_kernel@matoro.tk>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: matoro <matoro_mailinglist_kernel@matoro.tk>
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Merge tag 'block-6.0-2022-08-19' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"A few fixes that should go into this release:
- Small series of patches for ublk (ZiyangZhang)
- Remove dead function (Yu)
- Fix for running a block queue in case of resource starvation
(Yufen)"
* tag 'block-6.0-2022-08-19' of git://git.kernel.dk/linux-block:
blk-mq: run queue no matter whether the request is the last request
blk-mq: remove unused function blk_mq_queue_stopped()
ublk_drv: do not add a re-issued request aborted previously to ioucmd's task_work
ublk_drv: update comment for __ublk_fail_req()
ublk_drv: check ubq_daemon_is_dying() in __ublk_rq_task_work()
ublk_drv: update iod->addr for UBLK_IO_NEED_GET_DATA
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Merge tag 'io_uring-6.0-2022-08-19' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"A few fixes for regressions in this cycle:
- Two instances of using the wrong "has async data" helper (Pavel)
- Fixup zero-copy address import (Pavel)
- Bump zero-copy notification slot limit (Pavel)"
* tag 'io_uring-6.0-2022-08-19' of git://git.kernel.dk/linux-block:
io_uring/net: use right helpers for async_data
io_uring/notif: raise limit on notification slots
io_uring/net: improve zc addr import error handling
io_uring/net: use right helpers for async recycle
* Add a missing command name definition for ata_get_cmd_name(), from me.
* A fix to address a performance regression due to the default max_sectors queue limit for ATA devices connected
to AHCI adapters being too small, from John.
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Merge tag 'ata-6.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata
Pull ATA fixes from Damien Le Moal:
- Add a missing command name definition for ata_get_cmd_name(), from
me.
- A fix to address a performance regression due to the default
max_sectors queue limit for ATA devices connected to AHCI adapters
being too small, from John.
* tag 'ata-6.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dlemoal/libata:
ata: libata: Set __ATA_BASE_SHT max_sectors
ata: libata-eh: Add missing command name
- meson-gx: Fix error handling in ->probe()
- mtk-sd: Fix a command problem when using cqe off/disable
- pxamci: Fix error handling in ->probe()
- sdhci-of-dwcmshc: Fix broken support for the BlueField-3 variant
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Merge tag 'mmc-v6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
Pull MMC host fixes from Ulf Hansson:
- meson-gx: Fix error handling in ->probe()
- mtk-sd: Fix a command problem when using cqe off/disable
- pxamci: Fix error handling in ->probe()
- sdhci-of-dwcmshc: Fix broken support for the BlueField-3 variant
* tag 'mmc-v6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc:
mmc: sdhci-of-dwcmshc: Re-enable support for the BlueField-3 SoC
mmc: meson-gx: Fix an error handling path in meson_mmc_probe()
mmc: mtk-sd: Clear interrupts when cqe off/disable
mmc: pxamci: Fix another error handling path in pxamci_probe()
mmc: pxamci: Fix an error handling path in pxamci_probe()
