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Commit bbc344e1 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun 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>
parent 6adc5cac

arch/x86/include/asm/percpu.h

+1 −1
Original line number Diff line number Diff line
@@ -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);				\

include/asm-generic/percpu.h

+9 −2
Original line number Diff line number Diff line
@@ -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