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| author | David Woodhouse <dwmw2@infradead.org> | 2006-12-01 09:56:43 +0000 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2006-12-01 09:56:43 +0000 |
| commit | bd3c97a7c718bfb9f1e4f31c16c383a5c6f815eb (patch) | |
| tree | 3f56594e813c6f35cbacbdb3e137ba5bfd0b3069 /include/asm-x86_64/pda.h | |
| parent | 6c33cafc794d07c9254c160789120a0e98c088c9 (diff) | |
| parent | 0215ffb08ce99e2bb59eca114a99499a4d06e704 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'include/asm-x86_64/pda.h')
| -rw-r--r-- | include/asm-x86_64/pda.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/asm-x86_64/pda.h b/include/asm-x86_64/pda.h index 14996d962ba..5642634843c 100644 --- a/include/asm-x86_64/pda.h +++ b/include/asm-x86_64/pda.h @@ -109,6 +109,15 @@ extern struct x8664_pda _proxy_pda; #define sub_pda(field,val) pda_to_op("sub",field,val) #define or_pda(field,val) pda_to_op("or",field,val) +/* This is not atomic against other CPUs -- CPU preemption needs to be off */ +#define test_and_clear_bit_pda(bit,field) ({ \ + int old__; \ + asm volatile("btr %2,%%gs:%c3\n\tsbbl %0,%0" \ + : "=r" (old__), "+m" (_proxy_pda.field) \ + : "dIr" (bit), "i" (pda_offset(field)) : "memory"); \ + old__; \ +}) + #endif #define PDA_STACKOFFSET (5*8) |