David Hildenbrand 394290cba9 mm: turn USE_SPLIT_PTE_PTLOCKS / USE_SPLIT_PTE_PTLOCKS into Kconfig options ... Patch series "mm: split PTE/PMD PT table Kconfig cleanups+clarifications". This series is a follow up to the fixes: "[PATCH v1 0/2] mm/hugetlb: fix hugetlb vs. core-mm PT locking" When working on the fixes, I wondered why 8xx is fine (-> never uses split PT locks) and how PT locking even works properly with PMD page table sharing (-> always requires split PMD PT locks). Let's improve the split PT lock detection, make hugetlb properly depend on it and make 8xx bail out if it would ever get enabled by accident. As an alternative to patch #3 we could extend the Kconfig SPLIT_PTE_PTLOCKS option from patch #2 -- but enforcing it closer to the code that actually implements it feels a bit nicer for documentation purposes, and there is no need to actually disable it because it should always be disabled (!SMP). Did a bunch of cross-compilations to make sure that split PTE/PMD PT locks are still getting used where we would expect them. [1] https://lkml.kernel.org/r/20240725183955.2268884-1-david@redhat.com This patch (of 3): Let's clean that up a bit and prepare for depending on CONFIG_SPLIT_PMD_PTLOCKS in other Kconfig options. More cleanups would be reasonable (like the arch-specific "depends on" for CONFIG_SPLIT_PTE_PTLOCKS), but we'll leave that for another day. Link: https://lkml.kernel.org/r/20240726150728.3159964-1-david@redhat.com Link: https://lkml.kernel.org/r/20240726150728.3159964-2-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Reviewed-by: Qi Zheng <zhengqi.arch@bytedance.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Borislav Petkov <bp@alien8.de> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Christian Brauner <brauner@kernel.org> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Muchun Song <muchun.song@linux.dev> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Peter Xu <peterx@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2024-09-01 20:25:51 -07:00
..
bpf	bpf: Fix a kernel verifier crash in stacksafe()	2024-08-12 18:09:48 -07:00
cgroup	cgroup/cpuset: Eliminate unncessary sched domains rebuilds in hotplug	2024-08-05 10:54:25 -10:00
configs	mm/slab: Plumb kmem_buckets into __do_kmalloc_node()	2024-07-03 12:24:19 +02:00
debug	kdb: Get rid of redundant kdb_curr_task()	2024-06-21 15:49:29 +01:00
dma	dma-debug: avoid deadlock between dma debug vs printk and netconsole	2024-08-06 10:29:32 -07:00
entry	entry: Respect changes to system call number by trace_sys_enter()	2024-03-12 13:23:32 +01:00
events	perf/bpf: Don't call bpf_overflow_handler() for tracing events	2024-08-13 10:25:28 -07:00
futex	printk: Change type of CONFIG_BASE_SMALL to bool	2024-05-06 17:39:09 +02:00
gcov	gcov: add support for GCC 14	2024-06-15 10:43:06 -07:00
irq	genirq/irqdesc: Honor caller provided affinity in alloc_desc()	2024-08-07 17:27:00 +02:00
kcsan	kcsan: Add missing MODULE_DESCRIPTION() macro	2024-06-06 11:21:14 -07:00
livepatch	livepatch: Replace snprintf() with sysfs_emit()	2024-07-02 16:56:18 +02:00
locking	bcachefs fixes for 6.11-rc3	2024-08-08 13:27:31 -07:00
module	module: make waiting for a concurrent module loader interruptible	2024-08-09 08:33:28 -07:00
power	mm: remove the implementation of swap_free() and always use swap_free_nr()	2024-07-03 19:30:01 -07:00
printk	printk/panic: Allow cpu backtraces to be written into ringbuffer during panic	2024-08-13 14:16:22 +02:00
rcu	Merge branches 'doc.2024.06.06a', 'fixes.2024.07.04a', 'mb.2024.06.28a', 'nocb.2024.06.03a', 'rcu-tasks.2024.06.06a', 'rcutorture.2024.06.06a' and 'srcu.2024.06.18a' into HEAD	2024-07-04 13:54:17 -07:00
sched	task_stack: uninline stack_not_used	2024-09-01 20:25:49 -07:00
time	timekeeping: Fix bogus clock_was_set() invocation in do_adjtimex()	2024-08-05 16:14:14 +02:00
trace	tracing: Return from tracing_buffers_read() if the file has been closed	2024-08-09 12:59:35 -04:00
.gitignore
acct.c	kernel misc: Remove the now superfluous sentinel elements from ctl_table array	2024-04-24 09:43:53 +02:00
async.c	async: Use a dedicated unbound workqueue with raised min_active	2024-02-09 11:13:59 -10:00
audit_fsnotify.c
audit_tree.c	fsnotify: create a wrapper fsnotify_find_inode_mark()	2024-04-04 16:24:16 +02:00
audit_watch.c	fsnotify: create a wrapper fsnotify_find_inode_mark()	2024-04-04 16:24:16 +02:00
audit.c	audit: use KMEM_CACHE() instead of kmem_cache_create()	2024-01-25 10:12:22 -05:00
audit.h
auditfilter.c	ima: Avoid blocking in RCU read-side critical section	2024-06-13 14:26:50 -04:00
auditsc.c	audit,io_uring: io_uring openat triggers audit reference count underflow	2023-10-13 18:34:46 +02:00
backtracetest.c	backtracetest: add MODULE_DESCRIPTION()	2024-06-24 22:24:55 -07:00
bounds.c	bounds: Use the right number of bits for power-of-two CONFIG_NR_CPUS	2024-04-29 08:29:29 -07:00
capability.c	lsm: constify the 'target' parameter in security_capget()	2023-08-08 16:48:47 -04:00
cfi.c
compat.c
configs.c
context_tracking.c	context_tracking: Make context_tracking_key __ro_after_init	2024-03-22 11:18:18 +01:00
cpu_pm.c
cpu.c	cpu/SMT: Enable SMT only if a core is online	2024-08-13 10:31:24 +10:00
crash_core.c	Mainly singleton patches, documented in their respective changelogs.	2024-05-19 14:02:03 -07:00
crash_reserve.c	crash: fix riscv64 crash memory reserve dead loop	2024-08-15 22:16:16 -07:00
cred.c	cred: Use KMEM_CACHE() instead of kmem_cache_create()	2024-02-23 17:33:31 -05:00
delayacct.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
dma.c
elfcorehdr.c	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-02-23 17:48:22 -08:00
exec_domain.c
exit.c	task_stack: uninline stack_not_used	2024-09-01 20:25:49 -07:00
exit.h	exit: add internal include file with helpers	2023-09-21 12:03:50 -06:00
extable.c
fail_function.c
fork.c	mm: turn USE_SPLIT_PTE_PTLOCKS / USE_SPLIT_PTE_PTLOCKS into Kconfig options	2024-09-01 20:25:51 -07:00
freezer.c	Linux 6.7-rc6	2023-12-23 15:52:13 +01:00
gen_kheaders.sh	kheaders: use command -v to test for existence of cpio	2024-05-30 01:13:20 +09:00
groups.c	groups: Convert group_info.usage to refcount_t	2023-09-29 11:28:39 -07:00
hung_task.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
iomem.c	kernel/iomem.c: remove __weak ioremap_cache helper	2023-08-21 13:37:28 -07:00
irq_work.c
jump_label.c	jump_label: Fix the fix, brown paper bags galore	2024-07-31 12:57:39 +02:00
kallsyms_internal.h	kallsyms: get rid of code for absolute kallsyms	2024-07-20 16:33:21 +09:00
kallsyms_selftest.c	kallsyms: Match symbols exactly with CONFIG_LTO_CLANG	2024-08-15 09:33:35 -07:00
kallsyms_selftest.h
kallsyms.c	kallsyms: Match symbols exactly with CONFIG_LTO_CLANG	2024-08-15 09:33:35 -07:00
kcmp.c	file: convert to SLAB_TYPESAFE_BY_RCU	2023-10-19 11:02:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.kexec	crash: clean up kdump related config items	2024-02-23 17:48:22 -08:00
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: properly check for softirq context	2024-08-07 18:33:56 -07:00
kexec_core.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
kexec_elf.c
kexec_file.c	crash: add a new kexec flag for hotplug support	2024-04-23 14:59:01 +10:00
kexec_internal.h	crash: remove dependency of FA_DUMP on CRASH_DUMP	2024-02-23 17:48:22 -08:00
kexec.c	crash: add a new kexec flag for hotplug support	2024-04-23 14:59:01 +10:00
kheaders.c
kprobes.c	kprobes: Fix to check symbol prefixes correctly	2024-08-05 14:04:03 +09:00
ksyms_common.c
ksysfs.c	profiling: remove prof_cpu_mask	2024-07-29 10:45:54 -07:00
kthread.c	kunit: Handle test faults	2024-05-06 14:22:02 -06:00
latencytop.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
Makefile	crash: split crash dumping code out from kexec_core.c	2024-02-23 17:48:22 -08:00
module_signature.c
notifier.c
nsproxy.c	pidfd: add pidfs	2024-03-01 12:23:37 +01:00
numa.c	kernel/numa.c: Move logging out of numa.h	2023-12-20 19:26:30 -05:00
padata.c	padata: Fix possible divide-by-0 panic in padata_mt_helper()	2024-08-07 18:33:56 -07:00
panic.c	printk/panic: Allow cpu backtraces to be written into ringbuffer during panic	2024-08-13 14:16:22 +02:00
params.c	params: Fix multi-line comment style	2023-12-01 09:51:44 -08:00
pid_namespace.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
pid_sysctl.h	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
pid.c	pidfs: remove config option	2024-03-13 12:53:53 -07:00
profile.c	profiling: remove profile=sleep support	2024-08-04 13:36:28 -07:00
ptrace.c	ptrace_attach: shift send(SIGSTOP) into ptrace_set_stopped()	2024-02-22 15:38:52 -08:00
range.c
reboot.c	kernel misc: Remove the now superfluous sentinel elements from ctl_table array	2024-04-24 09:43:53 +02:00
regset.c	regset: use kvzalloc() for regset_get_alloc()	2024-04-25 21:07:03 -07:00
relay.c	kernel: relay: remove relay_file_splice_read dead code, doesn't work	2023-12-29 12:22:27 -08:00
resource_kunit.c	resource: add missing MODULE_DESCRIPTION()	2024-06-28 19:36:30 -07:00
resource.c	mm: kvmalloc: align kvrealloc() with krealloc()	2024-09-01 20:25:44 -07:00
rseq.c
scftorture.c	scftorture: Make torture_type static	2024-05-30 15:31:51 -07:00
scs.c
seccomp.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
signal.c	kernel: rerun task_work while freezing in get_signal()	2024-07-11 01:51:44 -06:00
smp.c	smp: Add missing destroy_work_on_stack() call in smp_call_on_cpu()	2024-07-10 22:40:39 +02:00
smpboot.c	kthread: add kthread_stop_put	2023-10-04 10:41:57 -07:00
smpboot.h
softirq.c	softirq: Fix suspicious RCU usage in __do_softirq()	2024-04-29 05:03:51 +02:00
stackleak.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
stacktrace.c	stacktrace: fix kernel-doc typo	2023-12-29 12:22:29 -08:00
static_call_inline.c
static_call.c
stop_machine.c
sys_ni.c	Probes updates for v6.11:	2024-07-18 12:19:20 -07:00
sys.c	RISC-V Patches for the 6.10 Merge Window, Part 1	2024-05-22 09:56:00 -07:00
sysctl-test.c	sysctl: Add module description to sysctl-testing	2024-06-03 15:20:37 +02:00
sysctl.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
task_work.c	task_work: make TWA_NMI_CURRENT handling conditional on IRQ_WORK	2024-07-29 12:05:06 -07:00
taskstats.c	taskstats: fill_stats_for_tgid: use for_each_thread()	2023-10-04 10:41:57 -07:00
torture.c	torture: Add MODULE_DESCRIPTION()	2024-05-30 15:31:38 -07:00
tracepoint.c
tsacct.c	tsacct: replace strncpy() with strscpy()	2024-07-12 16:39:53 -07:00
ucount.c	sysctl changes for v6.10-rc1	2024-05-17 17:31:24 -07:00
uid16.c
uid16.h
umh.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
up.c	smp: Change function signatures to use call_single_data_t	2023-09-13 14:59:24 +02:00
user_namespace.c	user_namespace: remove unnecessary NULL values from kbuf	2024-02-22 15:38:52 -08:00
user-return-notifier.c
user.c	printk: Change type of CONFIG_BASE_SMALL to bool	2024-05-06 17:39:09 +02:00
usermode_driver.c
utsname_sysctl.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
utsname.c
vhost_task.c	vhost_task: Handle SIGKILL by flushing work and exiting	2024-05-22 08:31:15 -04:00
vmcore_info.c	kallsyms: get rid of code for absolute kallsyms	2024-07-20 16:33:21 +09:00
watch_queue.c	watch_queue: fix kcalloc() arguments order	2023-12-21 13:17:54 +01:00
watchdog_buddy.c
watchdog_perf.c	watchdog/perf: properly initialize the turbo mode timestamp and rearm counter	2024-07-17 21:11:34 -07:00
watchdog.c	sysctl: treewide: constify the ctl_table argument of proc_handlers	2024-07-24 20:59:29 +02:00
workqueue_internal.h	workqueue: Drop the special locking rule for worker->flags and worker_pool->flags	2023-08-07 15:57:22 -10:00
workqueue.c	workqueue: Correct declaration of cpu_pwq in struct workqueue_struct	2024-08-05 18:34:02 -10:00