evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

i386: simplify smp_call_function_single() call sequence in cpuid

Browse source 
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>
This commit is contained in:
Avi Kivity 2007-10-17 18:04:38 +02:00 • committed by Thomas Gleixner
parent cddf7ff766
commit 4a40cb1ec6
1 changed files with 3 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

22
arch/x86/kernel/cpuid.c
View file

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