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Diffstat (limited to 'arch/x86/include/asm/percpu.h')
-rw-r--r--arch/x86/include/asm/percpu.h119
1 files changed, 87 insertions, 32 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 0c44196b78a..66a272dfd8b 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -25,19 +25,18 @@
*/
#ifdef CONFIG_SMP
#define PER_CPU(var, reg) \
- __percpu_mov_op %__percpu_seg:per_cpu__this_cpu_off, reg; \
- lea per_cpu__##var(reg), reg
-#define PER_CPU_VAR(var) %__percpu_seg:per_cpu__##var
+ __percpu_mov_op %__percpu_seg:this_cpu_off, reg; \
+ lea var(reg), reg
+#define PER_CPU_VAR(var) %__percpu_seg:var
#else /* ! SMP */
-#define PER_CPU(var, reg) \
- __percpu_mov_op $per_cpu__##var, reg
-#define PER_CPU_VAR(var) per_cpu__##var
+#define PER_CPU(var, reg) __percpu_mov_op $var, reg
+#define PER_CPU_VAR(var) var
#endif /* SMP */
#ifdef CONFIG_X86_64_SMP
#define INIT_PER_CPU_VAR(var) init_per_cpu__##var
#else
-#define INIT_PER_CPU_VAR(var) per_cpu__##var
+#define INIT_PER_CPU_VAR(var) var
#endif
#else /* ...!ASSEMBLY */
@@ -60,12 +59,12 @@
* There also must be an entry in vmlinux_64.lds.S
*/
#define DECLARE_INIT_PER_CPU(var) \
- extern typeof(per_cpu_var(var)) init_per_cpu_var(var)
+ extern typeof(var) init_per_cpu_var(var)
#ifdef CONFIG_X86_64_SMP
#define init_per_cpu_var(var) init_per_cpu__##var
#else
-#define init_per_cpu_var(var) per_cpu_var(var)
+#define init_per_cpu_var(var) var
#endif
/* For arch-specific code, we can use direct single-insn ops (they
@@ -104,6 +103,64 @@ do { \
} \
} while (0)
+/*
+ * Generate a percpu add to memory instruction and optimize code
+ * if a one is added or subtracted.
+ */
+#define percpu_add_op(var, val) \
+do { \
+ typedef typeof(var) pao_T__; \
+ const int pao_ID__ = (__builtin_constant_p(val) && \
+ ((val) == 1 || (val) == -1)) ? (val) : 0; \
+ if (0) { \
+ pao_T__ pao_tmp__; \
+ pao_tmp__ = (val); \
+ } \
+ switch (sizeof(var)) { \
+ case 1: \
+ if (pao_ID__ == 1) \
+ asm("incb "__percpu_arg(0) : "+m" (var)); \
+ else if (pao_ID__ == -1) \
+ asm("decb "__percpu_arg(0) : "+m" (var)); \
+ else \
+ asm("addb %1, "__percpu_arg(0) \
+ : "+m" (var) \
+ : "qi" ((pao_T__)(val))); \
+ break; \
+ case 2: \
+ if (pao_ID__ == 1) \
+ asm("incw "__percpu_arg(0) : "+m" (var)); \
+ else if (pao_ID__ == -1) \
+ asm("decw "__percpu_arg(0) : "+m" (var)); \
+ else \
+ asm("addw %1, "__percpu_arg(0) \
+ : "+m" (var) \
+ : "ri" ((pao_T__)(val))); \
+ break; \
+ case 4: \
+ if (pao_ID__ == 1) \
+ asm("incl "__percpu_arg(0) : "+m" (var)); \
+ else if (pao_ID__ == -1) \
+ asm("decl "__percpu_arg(0) : "+m" (var)); \
+ else \
+ asm("addl %1, "__percpu_arg(0) \
+ : "+m" (var) \
+ : "ri" ((pao_T__)(val))); \
+ break; \
+ case 8: \
+ if (pao_ID__ == 1) \
+ asm("incq "__percpu_arg(0) : "+m" (var)); \
+ else if (pao_ID__ == -1) \
+ asm("decq "__percpu_arg(0) : "+m" (var)); \
+ else \
+ asm("addq %1, "__percpu_arg(0) \
+ : "+m" (var) \
+ : "re" ((pao_T__)(val))); \
+ break; \
+ default: __bad_percpu_size(); \
+ } \
+} while (0)
+
#define percpu_from_op(op, var, constraint) \
({ \
typeof(var) pfo_ret__; \
@@ -142,16 +199,14 @@ do { \
* per-thread variables implemented as per-cpu variables and thus
* stable for the duration of the respective task.
*/
-#define percpu_read(var) percpu_from_op("mov", per_cpu__##var, \
- "m" (per_cpu__##var))
-#define percpu_read_stable(var) percpu_from_op("mov", per_cpu__##var, \
- "p" (&per_cpu__##var))
-#define percpu_write(var, val) percpu_to_op("mov", per_cpu__##var, val)
-#define percpu_add(var, val) percpu_to_op("add", per_cpu__##var, val)
-#define percpu_sub(var, val) percpu_to_op("sub", per_cpu__##var, val)
-#define percpu_and(var, val) percpu_to_op("and", per_cpu__##var, val)
-#define percpu_or(var, val) percpu_to_op("or", per_cpu__##var, val)
-#define percpu_xor(var, val) percpu_to_op("xor", per_cpu__##var, val)
+#define percpu_read(var) percpu_from_op("mov", var, "m" (var))
+#define percpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))
+#define percpu_write(var, val) percpu_to_op("mov", var, val)
+#define percpu_add(var, val) percpu_add_op(var, val)
+#define percpu_sub(var, val) percpu_add_op(var, -(val))
+#define percpu_and(var, val) percpu_to_op("and", var, val)
+#define percpu_or(var, val) percpu_to_op("or", var, val)
+#define percpu_xor(var, val) percpu_to_op("xor", var, val)
#define __this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
@@ -160,9 +215,9 @@ do { \
#define __this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define __this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
#define __this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
-#define __this_cpu_add_1(pcp, val) percpu_to_op("add", (pcp), val)
-#define __this_cpu_add_2(pcp, val) percpu_to_op("add", (pcp), val)
-#define __this_cpu_add_4(pcp, val) percpu_to_op("add", (pcp), val)
+#define __this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
+#define __this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
+#define __this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
#define __this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
#define __this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
#define __this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
@@ -179,9 +234,9 @@ do { \
#define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val)
#define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val)
-#define this_cpu_add_1(pcp, val) percpu_to_op("add", (pcp), val)
-#define this_cpu_add_2(pcp, val) percpu_to_op("add", (pcp), val)
-#define this_cpu_add_4(pcp, val) percpu_to_op("add", (pcp), val)
+#define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
+#define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
+#define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
@@ -192,9 +247,9 @@ do { \
#define this_cpu_xor_2(pcp, val) percpu_to_op("xor", (pcp), val)
#define this_cpu_xor_4(pcp, val) percpu_to_op("xor", (pcp), val)
-#define irqsafe_cpu_add_1(pcp, val) percpu_to_op("add", (pcp), val)
-#define irqsafe_cpu_add_2(pcp, val) percpu_to_op("add", (pcp), val)
-#define irqsafe_cpu_add_4(pcp, val) percpu_to_op("add", (pcp), val)
+#define irqsafe_cpu_add_1(pcp, val) percpu_add_op((pcp), val)
+#define irqsafe_cpu_add_2(pcp, val) percpu_add_op((pcp), val)
+#define irqsafe_cpu_add_4(pcp, val) percpu_add_op((pcp), val)
#define irqsafe_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val)
@@ -212,19 +267,19 @@ do { \
#ifdef CONFIG_X86_64
#define __this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
-#define __this_cpu_add_8(pcp, val) percpu_to_op("add", (pcp), val)
+#define __this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define __this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
#define __this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
#define __this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
#define this_cpu_read_8(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
#define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val)
-#define this_cpu_add_8(pcp, val) percpu_to_op("add", (pcp), val)
+#define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
#define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
#define this_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
-#define irqsafe_cpu_add_8(pcp, val) percpu_to_op("add", (pcp), val)
+#define irqsafe_cpu_add_8(pcp, val) percpu_add_op((pcp), val)
#define irqsafe_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val)
#define irqsafe_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val)
#define irqsafe_cpu_xor_8(pcp, val) percpu_to_op("xor", (pcp), val)
@@ -236,7 +291,7 @@ do { \
({ \
int old__; \
asm volatile("btr %2,"__percpu_arg(1)"\n\tsbbl %0,%0" \
- : "=r" (old__), "+m" (per_cpu__##var) \
+ : "=r" (old__), "+m" (var) \
: "dIr" (bit)); \
old__; \
})
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