linux-stable/arch/x86/include/asm/cpumask.h
Peter Zijlstra 14d3b376b6 x86/entry, cpumask: Provide non-instrumented variant of cpu_is_offline()
vmlinux.o: warning: objtool: exc_nmi()+0x12: call to cpumask_test_cpu.constprop.0() leaves .noinstr.text section
vmlinux.o: warning: objtool: mce_check_crashing_cpu()+0x12: call to cpumask_test_cpu.constprop.0()leaves .noinstr.text section

  cpumask_test_cpu()
    test_bit()
      instrument_atomic_read()
      arch_test_bit()

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
2020-06-15 14:10:09 +02:00

33 lines
829 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_CPUMASK_H
#define _ASM_X86_CPUMASK_H
#ifndef __ASSEMBLY__
#include <linux/cpumask.h>
extern cpumask_var_t cpu_callin_mask;
extern cpumask_var_t cpu_callout_mask;
extern cpumask_var_t cpu_initialized_mask;
extern cpumask_var_t cpu_sibling_setup_mask;
extern void setup_cpu_local_masks(void);
/*
* NMI and MCE exceptions need cpu_is_offline() _really_ early,
* provide an arch_ special for them to avoid instrumentation.
*/
#if NR_CPUS > 1
static __always_inline bool arch_cpu_online(int cpu)
{
return arch_test_bit(cpu, cpumask_bits(cpu_online_mask));
}
#else
static __always_inline bool arch_cpu_online(int cpu)
{
return cpu == 0;
}
#endif
#define arch_cpu_is_offline(cpu) unlikely(!arch_cpu_online(cpu))
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_CPUMASK_H */