diff options
| author | Will Deacon <will.deacon@arm.com> | 2018-02-27 10:48:31 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-03-27 13:15:29 +0100 |
| commit | c9406e514b95e825af20967430786a234d2dcabd (patch) | |
| tree | e0ca1dc1470d269a0975e8b14b0e9a6ff947c3a9 /arch/arm64/include/asm/percpu.h | |
| parent | e8a2d040fee54606ff62cc1f22e14ad9b2677f15 (diff) | |
arm64: move percpu cmpxchg implementation from cmpxchg.h to percpu.h
We want to avoid pulling linux/preempt.h into cmpxchg.h, since that can
introduce a circular dependency on linux/bitops.h. linux/preempt.h is
only needed by the per-cpu cmpxchg implementation, which is better off
alongside the per-cpu xchg implementation in percpu.h, so move it there
and add the missing #include.
Reported-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm/percpu.h')
| -rw-r--r-- | arch/arm64/include/asm/percpu.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h index 43393208229e..9234013e759e 100644 --- a/arch/arm64/include/asm/percpu.h +++ b/arch/arm64/include/asm/percpu.h @@ -16,7 +16,10 @@ #ifndef __ASM_PERCPU_H #define __ASM_PERCPU_H +#include <linux/preempt.h> + #include <asm/alternative.h> +#include <asm/cmpxchg.h> #include <asm/stack_pointer.h> static inline void set_my_cpu_offset(unsigned long off) @@ -197,6 +200,32 @@ static inline unsigned long __percpu_xchg(void *ptr, unsigned long val, return ret; } +/* this_cpu_cmpxchg */ +#define _protect_cmpxchg_local(pcp, o, n) \ +({ \ + typeof(*raw_cpu_ptr(&(pcp))) __ret; \ + preempt_disable(); \ + __ret = cmpxchg_local(raw_cpu_ptr(&(pcp)), o, n); \ + preempt_enable(); \ + __ret; \ +}) + +#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) +#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n) + +#define this_cpu_cmpxchg_double_8(ptr1, ptr2, o1, o2, n1, n2) \ +({ \ + int __ret; \ + preempt_disable(); \ + __ret = cmpxchg_double_local( raw_cpu_ptr(&(ptr1)), \ + raw_cpu_ptr(&(ptr2)), \ + o1, o2, n1, n2); \ + preempt_enable(); \ + __ret; \ +}) + #define _percpu_read(pcp) \ ({ \ typeof(pcp) __retval; \ |