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authorTejun Heo <tj@kernel.org>2014-06-18 03:12:34 +0400
committerTejun Heo <tj@kernel.org>2014-06-18 03:12:34 +0400
commitbbc344e1e3aef3034a0edc79f7f64a912517926b (patch)
tree2028db00bf8ef28736609fb41392fe7218ebdd80 /include/asm-generic/percpu.h
parent6adc5cac538b5d9162d8bcdb6145319592afc0d6 (diff)
downloadlinux-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>
Diffstat (limited to 'include/asm-generic/percpu.h')
-rw-r--r--include/asm-generic/percpu.h11
1 files changed, 9 insertions, 2 deletions
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