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    SubjectRe: [PATCH 31/36] cpuidle,acpi: Make noinstr clean
    On Wed, Jun 8, 2022 at 4:47 PM Peter Zijlstra <peterz@infradead.org> wrote:
    >
    > 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
    >
    > Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

    Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

    > ---
    > arch/x86/include/asm/shared/io.h | 4 ++--
    > drivers/acpi/processor_idle.c | 2 +-
    > include/linux/cpumask.h | 4 ++--
    > 3 files changed, 5 insertions(+), 5 deletions(-)
    >
    > --- a/arch/x86/include/asm/shared/io.h
    > +++ b/arch/x86/include/asm/shared/io.h
    > @@ -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" \
    > --- a/drivers/acpi/processor_idle.c
    > +++ b/drivers/acpi/processor_idle.c
    > @@ -593,7 +593,7 @@ static int acpi_idle_play_dead(struct cp
    > 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);
    > --- a/include/linux/cpumask.h
    > +++ b/include/linux/cpumask.h
    > @@ -908,9 +908,9 @@ static inline const struct cpumask *get_
    > * 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)
    >
    >

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