i386: simplify smp_call_function_single() call sequence in cpuid
Avi Kivity [Wed, 17 Oct 2007 16:04:38 +0000 (18:04 +0200)]
smp_call_function_single() now knows how to call the function on the
current cpu.

[ tglx: arch/x86 adaptation ]

Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/cpuid.c

index dffb102..70dcf91 100644 (file)
@@ -43,8 +43,6 @@
 
 static struct class *cpuid_class;
 
-#ifdef CONFIG_SMP
-
 struct cpuid_command {
        u32 reg;
        u32 *data;
@@ -62,25 +60,11 @@ static inline void do_cpuid(int cpu, u32 reg, u32 * data)
 {
        struct cpuid_command cmd;
 
-       preempt_disable();
-       if (cpu == smp_processor_id()) {
-               cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
-       } else {
-               cmd.reg = reg;
-               cmd.data = data;
+       cmd.reg = reg;
+       cmd.data = data;
 
-               smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1, 1);
-       }
-       preempt_enable();
+       smp_call_function_single(cpu, cpuid_smp_cpuid, &cmd, 1, 1);
 }
-#else                          /* ! CONFIG_SMP */
-
-static inline void do_cpuid(int cpu, u32 reg, u32 * data)
-{
-       cpuid(reg, &data[0], &data[1], &data[2], &data[3]);
-}
-
-#endif                         /* ! CONFIG_SMP */
 
 static loff_t cpuid_seek(struct file *file, loff_t offset, int orig)
 {