Support generating inc/dec instruction. Currently we create an add 1 instruction. Saves one byte per use of this_cpu_xx. Signed-off-by: Christoph Lameter --- arch/x86/include/asm/percpu.h | 47 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) Index: linux-2.6/arch/x86/include/asm/percpu.h =================================================================== --- linux-2.6.orig/arch/x86/include/asm/percpu.h 2009-12-18 12:45:31.000000000 -0600 +++ linux-2.6/arch/x86/include/asm/percpu.h 2009-12-18 14:22:40.000000000 -0600 @@ -133,6 +133,29 @@ do { \ pfo_ret__; \ }) +#define percpu_var_op(op, var) \ +({ \ + switch (sizeof(var)) { \ + case 1: \ + asm(op "b "__percpu_arg(0) \ + : "+m" (var) :); \ + break; \ + case 2: \ + asm(op "w "__percpu_arg(0) \ + : "+m" (var) :); \ + break; \ + case 4: \ + asm(op "l "__percpu_arg(0) \ + : "+m" (var) :); \ + break; \ + case 8: \ + asm(op "q "__percpu_arg(0) \ + : "+m" (var) :); \ + break; \ + default: __bad_percpu_size(); \ + } \ +}) + /* * percpu_read() makes gcc load the percpu variable every time it is * accessed while percpu_read_stable() allows the value to be cached. @@ -163,6 +186,12 @@ do { \ #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_inc_1(pcp) percpu_var_op("inc", (pcp)) +#define __this_cpu_inc_2(pcp) percpu_var_op("inc", (pcp)) +#define __this_cpu_inc_4(pcp) percpu_var_op("inc", (pcp)) +#define __this_cpu_dec_1(pcp) percpu_var_op("dec", (pcp)) +#define __this_cpu_dec_2(pcp) percpu_var_op("dec", (pcp)) +#define __this_cpu_dec_4(pcp) percpu_var_op("dec", (pcp)) #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) @@ -182,6 +211,12 @@ do { \ #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_inc_1(pcp) percpu_var_op("inc", (pcp)) +#define this_cpu_inc_2(pcp) percpu_var_op("inc", (pcp)) +#define this_cpu_inc_4(pcp) percpu_var_op("inc", (pcp)) +#define this_cpu_dec_1(pcp) percpu_var_op("dec", (pcp)) +#define this_cpu_dec_2(pcp) percpu_var_op("dec", (pcp)) +#define this_cpu_dec_4(pcp) percpu_var_op("dec", (pcp)) #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) @@ -195,6 +230,12 @@ do { \ #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_inc_1(pcp) percpu_var_op("inc", (pcp)) +#define irqsafe_cpu_inc_2(pcp) percpu_var_op("inc", (pcp)) +#define irqsafe_cpu_inc_4(pcp) percpu_var_op("inc", (pcp)) +#define irqsafe_cpu_dec_1(pcp) percpu_var_op("dec", (pcp)) +#define irqsafe_cpu_dec_2(pcp) percpu_var_op("dec", (pcp)) +#define irqsafe_cpu_dec_4(pcp) percpu_var_op("dec", (pcp)) #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) @@ -213,6 +254,8 @@ do { \ #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_inc_8(pcp) percpu_var_op("inc", (pcp)) +#define __this_cpu_dec_8(pcp) percpu_var_op("dec", (pcp)) #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) @@ -220,11 +263,15 @@ do { \ #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_inc_8(pcp) percpu_var_op("inc", (pcp)) +#define this_cpu_dec_8(pcp) percpu_var_op("dec", (pcp)) #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_inc_8(pcp) percpu_var_op("inc", (pcp)) +#define irqsafe_cpu_dec_8(pcp) percpu_var_op("dec", (pcp)) #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) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org 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