diff options
Diffstat (limited to 'arch/x86/include/asm/percpu.h')
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 556f84b..328b31a 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -121,6 +121,16 @@ do { \ #define x86_sub_percpu(var, val) percpu_to_op("sub", per_cpu__##var, val) #define x86_or_percpu(var, val) percpu_to_op("or", per_cpu__##var, val) +/* This is not atomic against other CPUs -- CPU preemption needs to be off */ +#define x86_test_and_clear_bit_percpu(bit, var) \ +({ \ + int old__; \ + asm volatile("btr %1,"__percpu_seg_str"%c2\n\tsbbl %0,%0" \ + : "=r" (old__) \ + : "dIr" (bit), "i" (&per_cpu__##var) : "memory"); \ + old__; \ +}) + #ifdef CONFIG_X86_64 extern void load_pda_offset(int cpu); #else |
