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cpumask: Add a x86-specific cpumask_clear_cpu() helper

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Add a x86-specific cpumask_clear_cpu() helper which will be used in
places where the explicit KASAN-instrumentation in the *_bit() helpers
is unwanted.

Also, always inline two more cpumask generic helpers.

allyesconfig:

     text    data     bss     dec     hex filename
  190553143       159425889       32076404        382055436       16c5b40c vmlinux.before
  190551812       159424945       32076404        382053161       16c5ab29 vmlinux.after

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Marco Elver <elver@google.com>
Link: https://lore.kernel.org/r/20220204083015.17317-2-bp@alien8.de
This commit is contained in:
Borislav Petkov 2022-02-04 09:30:13 +01:00
parent 1c6f9ec009
commit f5c54f77b0
2 changed files with 12 additions and 2 deletions
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10
arch/x86/include/asm/cpumask.h
View File

@ -20,11 +20,21 @@ static __always_inline bool arch_cpu_online(int cpu)
{
return arch_test_bit(cpu, cpumask_bits(cpu_online_mask));
}
static __always_inline void arch_cpumask_clear_cpu(int cpu, struct cpumask *dstp)
{
arch_clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
}
#else
static __always_inline bool arch_cpu_online(int cpu)
{
return cpu == 0;
}
static __always_inline void arch_cpumask_clear_cpu(int cpu, struct cpumask *dstp)
{
return;
}
#endif
#define arch_cpu_is_offline(cpu) unlikely(!arch_cpu_online(cpu))

4
include/linux/cpumask.h
View File

@ -102,7 +102,7 @@ extern atomic_t __num_online_cpus;
extern cpumask_t cpus_booted_once_mask;
static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
static __always_inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
{
#ifdef CONFIG_DEBUG_PER_CPU_MAPS
WARN_ON_ONCE(cpu >= bits);
@ -110,7 +110,7 @@ static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
}
/* verify cpu argument to cpumask_* operators */
static inline unsigned int cpumask_check(unsigned int cpu)
static __always_inline unsigned int cpumask_check(unsigned int cpu)
{
cpu_max_bits_warn(cpu, nr_cpumask_bits);
return cpu;