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| author | Tejun Heo <tj@kernel.org> | 2014-06-18 03:12:34 +0400 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2014-06-18 03:12:34 +0400 |
| commit | bbc344e1e3aef3034a0edc79f7f64a912517926b (patch) | |
| tree | 2028db00bf8ef28736609fb41392fe7218ebdd80 | |
| parent | 6adc5cac538b5d9162d8bcdb6145319592afc0d6 (diff) | |
| download | linux-bbc344e1e3aef3034a0edc79f7f64a912517926b.tar.xz | |
percpu: introduce arch_raw_cpu_ptr()
Currently, archs can override raw_cpu_ptr() directly; however, we
wanna build a layer of indirection in the generic part of percpu so
that we can implement generic features there without affecting archs.
Introduce arch_raw_cpu_ptr() which is used to define raw_cpu_ptr() by
generic percpu code. The two are identical for now. x86 is currently
the only arch which overrides raw_cpu_ptr() and is converted to
define arch_raw_cpu_ptr() instead.
This doesn't introduce any functional difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
| -rw-r--r-- | arch/x86/include/asm/percpu.h | 2 | ||||
| -rw-r--r-- | include/asm-generic/percpu.h | 11 |
2 files changed, 10 insertions, 3 deletions
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 851bcdc5db04..9bc23f18a6fa 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -52,7 +52,7 @@ * Compared to the generic __my_cpu_offset version, the following * saves one instruction and avoids clobbering a temp register. */ -#define raw_cpu_ptr(ptr) \ +#define arch_raw_cpu_ptr(ptr) \ ({ \ unsigned long tcp_ptr__; \ __verify_pcpu_ptr(ptr); \ diff --git a/include/asm-generic/percpu.h b/include/asm-generic/percpu.h index 63d2b68c826e..a247d80b6630 100644 --- a/include/asm-generic/percpu.h +++ b/include/asm-generic/percpu.h @@ -53,9 +53,16 @@ extern unsigned long __per_cpu_offset[NR_CPUS]; #define per_cpu(var, cpu) \ (*SHIFT_PERCPU_PTR(&(var), per_cpu_offset(cpu))) -#ifndef raw_cpu_ptr -#define raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset) +/* + * Arch may define arch_raw_cpu_ptr() to provide more efficient address + * translations for raw_cpu_ptr(). + */ +#ifndef arch_raw_cpu_ptr +#define arch_raw_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, __my_cpu_offset) #endif + +#define raw_cpu_ptr(ptr) arch_raw_cpu_ptr(ptr) + #ifdef CONFIG_DEBUG_PREEMPT #define this_cpu_ptr(ptr) SHIFT_PERCPU_PTR(ptr, my_cpu_offset) #else |