diff options
Diffstat (limited to 'arch/x86/include/asm/percpu.h')
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 0f12b2004b94..3859abad19ec 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -28,6 +28,7 @@ #else /* ...!ASSEMBLY */ +#include <linux/build_bug.h> #include <linux/kernel.h> #include <linux/stringify.h> @@ -462,6 +463,7 @@ do { \ #define this_cpu_write_8(pcp, val) __raw_cpu_write(volatile, pcp, val) #endif +#define this_cpu_read_const(pcp) __raw_cpu_read(, pcp) #else /* CONFIG_USE_X86_SEG_SUPPORT */ #define raw_cpu_read_1(pcp) percpu_from_op(1, , "mov", pcp) @@ -486,6 +488,11 @@ do { \ #define this_cpu_write_8(pcp, val) percpu_to_op(8, volatile, "mov", (pcp), val) #endif +/* + * The generic per-cpu infrastrucutre is not suitable for + * reading const-qualified variables. + */ +#define this_cpu_read_const(pcp) ({ BUILD_BUG(); (typeof(pcp))0; }) #endif /* CONFIG_USE_X86_SEG_SUPPORT */ #define raw_cpu_add_1(pcp, val) percpu_add_op(1, , (pcp), val) |