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objtool/idle: Validate __cpuidle code as noinstr

Browse Source 
Idle code is very like entry code in that RCU isn't available. As
such, add a little validation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195540.373461409@infradead.org
This commit is contained in:
Peter Zijlstra 2023-01-12 20:43:31 +01:00 committed by Ingo Molnar
parent 00717eb8c9
commit 2b5a0e425e
32 changed files with 27 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/alpha/kernel/vmlinux.lds.S
View File

@ -27,7 +27,6 @@ SECTIONS
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
*(.fixup)
*(.gnu.warning)

1
arch/arc/kernel/vmlinux.lds.S
View File

@ -85,7 +85,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/arm/include/asm/vmlinux.lds.h
View File

@ -96,7 +96,6 @@
SOFTIRQENTRY_TEXT \
TEXT_TEXT \
SCHED_TEXT \
CPUIDLE_TEXT \
LOCK_TEXT \
KPROBES_TEXT \
ARM_STUBS_TEXT \

1
arch/arm64/kernel/vmlinux.lds.S
View File

@ -175,7 +175,6 @@ SECTIONS
ENTRY_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
HYPERVISOR_TEXT

1
arch/csky/kernel/vmlinux.lds.S
View File

@ -34,7 +34,6 @@ SECTIONS
SOFTIRQENTRY_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
*(.fixup)

1
arch/hexagon/kernel/vmlinux.lds.S
View File

@ -41,7 +41,6 @@ SECTIONS
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
*(.fixup)

1
arch/ia64/kernel/vmlinux.lds.S
View File

@ -51,7 +51,6 @@ SECTIONS {
__end_ivt_text = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/loongarch/kernel/vmlinux.lds.S
View File

@ -43,7 +43,6 @@ SECTIONS
.text : {
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/m68k/kernel/vmlinux-nommu.lds
View File

@ -48,7 +48,6 @@ SECTIONS {
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
*(.fixup)
. = ALIGN(16);

1
arch/m68k/kernel/vmlinux-std.lds
View File

@ -19,7 +19,6 @@ SECTIONS
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
*(.fixup)
*(.gnu.warning)

1
arch/m68k/kernel/vmlinux-sun3.lds
View File

@ -19,7 +19,6 @@ SECTIONS
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
*(.fixup)
*(.gnu.warning)

1
arch/microblaze/kernel/vmlinux.lds.S
View File

@ -36,7 +36,6 @@ SECTIONS {
EXIT_TEXT
EXIT_CALL
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/mips/kernel/vmlinux.lds.S
View File

@ -61,7 +61,6 @@ SECTIONS
.text : {
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/nios2/kernel/vmlinux.lds.S
View File

@ -24,7 +24,6 @@ SECTIONS
.text : {
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT

1
arch/openrisc/kernel/vmlinux.lds.S
View File

@ -52,7 +52,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/parisc/kernel/vmlinux.lds.S
View File

@ -86,7 +86,6 @@ SECTIONS
TEXT_TEXT
LOCK_TEXT
SCHED_TEXT
CPUIDLE_TEXT
KPROBES_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT

1
arch/powerpc/kernel/vmlinux.lds.S
View File

@ -111,7 +111,6 @@ SECTIONS
#endif
NOINSTR_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/riscv/kernel/vmlinux-xip.lds.S
View File

@ -39,7 +39,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
ENTRY_TEXT

1
arch/riscv/kernel/vmlinux.lds.S
View File

@ -42,7 +42,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
ENTRY_TEXT

1
arch/s390/kernel/vmlinux.lds.S
View File

@ -42,7 +42,6 @@ SECTIONS
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/sh/kernel/vmlinux.lds.S
View File

@ -29,7 +29,6 @@ SECTIONS
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/sparc/kernel/vmlinux.lds.S
View File

@ -50,7 +50,6 @@ SECTIONS
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
IRQENTRY_TEXT

1
arch/um/kernel/dyn.lds.S
View File

@ -74,7 +74,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT

1
arch/um/kernel/uml.lds.S
View File

@ -35,7 +35,6 @@ SECTIONS
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
IRQENTRY_TEXT
SOFTIRQENTRY_TEXT

11
arch/x86/include/asm/irqflags.h
View File

@ -8,9 +8,6 @@
#include <asm/nospec-branch.h>
/* Provide __cpuidle; we can't safely include <linux/cpu.h> */
#define __cpuidle __section(".cpuidle.text")
/*
* Interrupt control:
*/
@ -45,13 +42,13 @@ static __always_inline void native_irq_enable(void)
asm volatile("sti": : :"memory");
}
static inline __cpuidle void native_safe_halt(void)
static __always_inline void native_safe_halt(void)
{
mds_idle_clear_cpu_buffers();
asm volatile("sti; hlt": : :"memory");
}
static inline __cpuidle void native_halt(void)
static __always_inline void native_halt(void)
{
mds_idle_clear_cpu_buffers();
asm volatile("hlt": : :"memory");
@ -84,7 +81,7 @@ static __always_inline void arch_local_irq_enable(void)
* Used in the idle loop; sti takes one instruction cycle
* to complete:
*/
static inline __cpuidle void arch_safe_halt(void)
static __always_inline void arch_safe_halt(void)
{
native_safe_halt();
}
@ -93,7 +90,7 @@ static inline __cpuidle void arch_safe_halt(void)
* Used when interrupts are already enabled or to
* shutdown the processor:
*/
static inline __cpuidle void halt(void)
static __always_inline void halt(void)
{
native_halt();
}

2
arch/x86/include/asm/mwait.h
View File

@ -105,7 +105,7 @@ static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
* New with Core Duo processors, MWAIT can take some hints based on CPU
* capability.
*/
static inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
static __always_inline void mwait_idle_with_hints(unsigned long eax, unsigned long ecx)
{
if (static_cpu_has_bug(X86_BUG_MONITOR) || !current_set_polling_and_test()) {
if (static_cpu_has_bug(X86_BUG_CLFLUSH_MONITOR)) {

1
arch/x86/kernel/vmlinux.lds.S
View File

@ -129,7 +129,6 @@ SECTIONS
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
SOFTIRQENTRY_TEXT

1
arch/xtensa/kernel/vmlinux.lds.S
View File

@ -125,7 +125,6 @@ SECTIONS
ENTRY_TEXT
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
*(.fixup)
}

9
include/asm-generic/vmlinux.lds.h
View File

@ -558,6 +558,9 @@
ALIGN_FUNCTION(); \
__noinstr_text_start = .; \
*(.noinstr.text) \
__cpuidle_text_start = .; \
*(.cpuidle.text) \
__cpuidle_text_end = .; \
__noinstr_text_end = .;
/*
@ -598,12 +601,6 @@
*(.spinlock.text) \
__lock_text_end = .;
#define CPUIDLE_TEXT \
ALIGN_FUNCTION(); \
__cpuidle_text_start = .; \
*(.cpuidle.text) \
__cpuidle_text_end = .;
#define KPROBES_TEXT \
ALIGN_FUNCTION(); \
__kprobes_text_start = .; \

8
include/linux/compiler_types.h
View File

@ -232,11 +232,15 @@ struct ftrace_likely_data {
#endif
/* Section for code which can't be instrumented at all */
#define noinstr \
noinline notrace __attribute((__section__(".noinstr.text"))) \
#define __noinstr_section(section) \
noinline notrace __attribute((__section__(section))) \
__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage \
__no_sanitize_memory
#define noinstr __noinstr_section(".noinstr.text")
#define __cpuidle __noinstr_section(".cpuidle.text")
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */

3
include/linux/cpu.h
View File

@ -176,9 +176,6 @@ void __noreturn cpu_startup_entry(enum cpuhp_state state);
void cpu_idle_poll_ctrl(bool enable);
/* Attach to any functions which should be considered cpuidle. */
#define __cpuidle __section(".cpuidle.text")
bool cpu_in_idle(unsigned long pc);
void arch_cpu_idle(void);

13
tools/objtool/check.c
View File

@ -376,6 +376,7 @@ static int decode_instructions(struct objtool_file *file)
if (!strcmp(sec->name, ".noinstr.text") ||
!strcmp(sec->name, ".entry.text") ||
!strcmp(sec->name, ".cpuidle.text") ||
!strncmp(sec->name, ".text.__x86.", 12))
sec->noinstr = true;
@ -3365,6 +3366,12 @@ static inline bool noinstr_call_dest(struct objtool_file *file,
if (func->sec->noinstr)
return true;
/*
* If the symbol is a static_call trampoline, we can't tell.
*/
if (func->static_call_tramp)
return true;
/*
* The __ubsan_handle_*() calls are like WARN(), they only happen when
* something 'BAD' happened. At the risk of taking the machine down,
@ -4162,6 +4169,12 @@ static int validate_noinstr_sections(struct objtool_file *file)
warnings += validate_unwind_hints(file, sec);
}
sec = find_section_by_name(file->elf, ".cpuidle.text");
if (sec) {
warnings += validate_section(file, sec);
warnings += validate_unwind_hints(file, sec);
}
return warnings;
}