Introduce raw_cpu_read_long() macro to slightly reduce ifdeffery
in arch/x86/include/asm/percpu.h.
No functional changes intended.
Signed-off-by: Uros Bizjak <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
---
arch/x86/include/asm/percpu.h | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index d6ff0db32209..3bedee1801e2 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -59,12 +59,6 @@
#define __force_percpu_prefix "%%"__stringify(__percpu_seg)":"
#define __my_cpu_offset this_cpu_read(this_cpu_off)
-#ifdef CONFIG_X86_64
-#define __raw_my_cpu_offset raw_cpu_read_8(this_cpu_off);
-#else
-#define __raw_my_cpu_offset raw_cpu_read_4(this_cpu_off);
-#endif
-
/*
* Compared to the generic __my_cpu_offset version, the following
* saves one instruction and avoids clobbering a temp register.
@@ -76,7 +70,7 @@
#ifndef BUILD_VDSO32_64
#define arch_raw_cpu_ptr(_ptr) \
({ \
- unsigned long tcp_ptr__ = __raw_my_cpu_offset; \
+ unsigned long tcp_ptr__ = raw_cpu_read_long(this_cpu_off); \
tcp_ptr__ += (__force unsigned long)(_ptr); \
(typeof(*(_ptr)) __kernel __force *)tcp_ptr__; \
})
@@ -563,9 +557,13 @@ do { \
#define this_cpu_xchg_8(pcp, nval) this_percpu_xchg_op(pcp, nval)
#define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(8, volatile, pcp, oval, nval)
#define this_cpu_try_cmpxchg_8(pcp, ovalp, nval) percpu_try_cmpxchg_op(8, volatile, pcp, ovalp, nval)
+
+#define raw_cpu_read_long(pcp) raw_cpu_read_8(pcp)
#else
/* There is no generic 64 bit read stable operation for 32 bit targets. */
-#define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
+#define this_cpu_read_stable_8(pcp) ({ BUILD_BUG(); (typeof(pcp))0; })
+
+#define raw_cpu_read_long(pcp) raw_cpu_read_4(pcp)
#endif
#define x86_this_cpu_constant_test_bit(_nr, _var) \
--
2.44.0