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authorJan Beulich <JBeulich@novell.com>2010-04-21 15:21:51 +0100
committerH. Peter Anvin <hpa@zytor.com>2010-04-28 16:58:49 -0700
commit402af0d7c692ddcfa2333e93d3f275ebd0487926 (patch)
tree08d016caa7dc404d7400281b57fb634108b0291f
parent1d16b0f2f3edf05f12a9e3960588e0d4854157bb (diff)
downloadop-kernel-dev-402af0d7c692ddcfa2333e93d3f275ebd0487926.zip
op-kernel-dev-402af0d7c692ddcfa2333e93d3f275ebd0487926.tar.gz
x86, asm: Introduce and use percpu_inc()
... generating slightly smaller code. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <4BCF261F020000780003B33C@vpn.id2.novell.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--arch/x86/include/asm/hardirq.h2
-rw-r--r--arch/x86/include/asm/percpu.h24
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c4
3 files changed, 27 insertions, 3 deletions
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 0f85764..aeab29a 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -35,7 +35,7 @@ DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);
#define __ARCH_IRQ_STAT
-#define inc_irq_stat(member) percpu_add(irq_stat.member, 1)
+#define inc_irq_stat(member) percpu_inc(irq_stat.member)
#define local_softirq_pending() percpu_read(irq_stat.__softirq_pending)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 66a272d..0ec6d12 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -190,6 +190,29 @@ do { \
pfo_ret__; \
})
+#define percpu_unary_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.
@@ -207,6 +230,7 @@ do { \
#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 percpu_inc(var) percpu_unary_op("inc", var)
#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))
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 8a6f0af..7a355dd 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -539,7 +539,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
struct mce m;
int i;
- __get_cpu_var(mce_poll_count)++;
+ percpu_inc(mce_poll_count);
mce_setup(&m);
@@ -934,7 +934,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)
atomic_inc(&mce_entry);
- __get_cpu_var(mce_exception_count)++;
+ percpu_inc(mce_exception_count);
if (notify_die(DIE_NMI, "machine check", regs, error_code,
18, SIGKILL) == NOTIFY_STOP)
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