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cpuidle, ACPI: Make noinstr clean

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objtool found cases where ACPI methods called out into instrumentation code:

  vmlinux.o: warning: objtool: io_idle+0xc: call to __inb.isra.0() leaves .noinstr.text section
  vmlinux.o: warning: objtool: acpi_idle_enter+0xfe: call to num_online_cpus() leaves .noinstr.text section
  vmlinux.o: warning: objtool: acpi_idle_enter+0x115: call to acpi_idle_fallback_to_c1.isra.0() leaves .noinstr.text section

Fix this by: marking the IO in/out, acpi_idle_fallback_to_c1() and
num_online_cpus() methods as __always_inline.

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: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Frederic Weisbecker <frederic@kernel.org>
Link: https://lore.kernel.org/r/20230112195541.294846301@infradead.org
This commit is contained in:
Peter Zijlstra 2023-01-12 20:43:46 +01:00 committed by Ingo Molnar
parent 10fdb38cee
commit 6a123d6ae6
3 changed files with 5 additions and 5 deletions
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4
arch/x86/include/asm/shared/io.h
View File

@ -5,13 +5,13 @@
#include <linux/types.h>
#define BUILDIO(bwl, bw, type) \
static inline void __out##bwl(type value, u16 port) \
static __always_inline void __out##bwl(type value, u16 port) \
{ \
asm volatile("out" #bwl " %" #bw "0, %w1" \
: : "a"(value), "Nd"(port)); \
} \
\
static inline type __in##bwl(u16 port) \
static __always_inline type __in##bwl(u16 port) \
{ \
type value; \
asm volatile("in" #bwl " %w1, %" #bw "0" \

2
drivers/acpi/processor_idle.c
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@ -607,7 +607,7 @@ static int acpi_idle_play_dead(struct cpuidle_device *dev, int index)
return 0;
}
static bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
static __always_inline bool acpi_idle_fallback_to_c1(struct acpi_processor *pr)
{
return IS_ENABLED(CONFIG_HOTPLUG_CPU) && !pr->flags.has_cst &&
!(acpi_gbl_FADT.flags & ACPI_FADT_C2_MP_SUPPORTED);

4
include/linux/cpumask.h
View File

@ -1017,9 +1017,9 @@ static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
* concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
* region.
*/
static inline unsigned int num_online_cpus(void)
static __always_inline unsigned int num_online_cpus(void)
{
return atomic_read(&__num_online_cpus);
return arch_atomic_read(&__num_online_cpus);
}
#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
#define num_present_cpus() cpumask_weight(cpu_present_mask)