diff options
author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-19 13:02:47 -0700 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-19 13:02:47 -0700 |
commit | dfc568e6bc08916f1035af456e4631c47166b5cf (patch) | |
tree | 3c96bdc26687e0f6958e790c8c93c0c6efb6b8d6 /arch/tile/include/asm/percpu.h | |
parent | fdf91dae6f024c6dfee425fe754df6b1957f6c53 (diff) | |
parent | 31d141e3a666269a3b6fcccddb0351caf7454240 (diff) |
Merge 3.12-rc6 into char-misc-next
We want the fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/tile/include/asm/percpu.h')
-rw-r--r-- | arch/tile/include/asm/percpu.h | 34 |
1 files changed, 31 insertions, 3 deletions
diff --git a/arch/tile/include/asm/percpu.h b/arch/tile/include/asm/percpu.h index 63294f5a8efb..4f7ae39fa202 100644 --- a/arch/tile/include/asm/percpu.h +++ b/arch/tile/include/asm/percpu.h @@ -15,9 +15,37 @@ #ifndef _ASM_TILE_PERCPU_H #define _ASM_TILE_PERCPU_H -register unsigned long __my_cpu_offset __asm__("tp"); -#define __my_cpu_offset __my_cpu_offset -#define set_my_cpu_offset(tp) (__my_cpu_offset = (tp)) +register unsigned long my_cpu_offset_reg asm("tp"); + +#ifdef CONFIG_PREEMPT +/* + * For full preemption, we can't just use the register variable + * directly, since we need barrier() to hazard against it, causing the + * compiler to reload anything computed from a previous "tp" value. + * But we also don't want to use volatile asm, since we'd like the + * compiler to be able to cache the value across multiple percpu reads. + * So we use a fake stack read as a hazard against barrier(). + * The 'U' constraint is like 'm' but disallows postincrement. + */ +static inline unsigned long __my_cpu_offset(void) +{ + unsigned long tp; + register unsigned long *sp asm("sp"); + asm("move %0, tp" : "=r" (tp) : "U" (*sp)); + return tp; +} +#define __my_cpu_offset __my_cpu_offset() +#else +/* + * We don't need to hazard against barrier() since "tp" doesn't ever + * change with PREEMPT_NONE, and with PREEMPT_VOLUNTARY it only + * changes at function call points, at which we are already re-reading + * the value of "tp" due to "my_cpu_offset_reg" being a global variable. + */ +#define __my_cpu_offset my_cpu_offset_reg +#endif + +#define set_my_cpu_offset(tp) (my_cpu_offset_reg = (tp)) #include <asm-generic/percpu.h> |