Messages in this thread Patch in this message | | | From | Vlad Zolotarov <> | Subject | [PATCH 1/2] x86: Define early read-mostly per-cpu macros | Date | Tue, 17 Apr 2012 14:16:01 +0300 |
| |
From: Ido Yariv <ido@wizery.com>
Some read-mostly per-cpu data may need to be declared or defined early, so it can be initialized and accessed before per_cpu areas are allocated.
Only the data that resides in the per_cpu areas should be read-mostly, as there is little benefit in optimizing cache lines on initialization.
Signed-off-by: Ido Yariv <ido@wizery.com> Signed-off-by: Shai Fultheim <shai@scalemp.com> Signed-off-by: Vlad Zolotarov <vlad@scalemp.com> --- arch/x86/include/asm/percpu.h | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 7a11910..6568662 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -555,6 +555,12 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off); { [0 ... NR_CPUS-1] = _initvalue }; \ __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map +#define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ + DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \ + __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ + { [0 ... NR_CPUS-1] = _initvalue }; \ + __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map + #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ EXPORT_PER_CPU_SYMBOL(_name) @@ -563,6 +569,11 @@ DECLARE_PER_CPU(unsigned long, this_cpu_off); extern __typeof__(_type) *_name##_early_ptr; \ extern __typeof__(_type) _name##_early_map[] +#define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ + DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \ + extern __typeof__(_type) *_name##_early_ptr; \ + extern __typeof__(_type) _name##_early_map[] + #define early_per_cpu_ptr(_name) (_name##_early_ptr) #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) #define early_per_cpu(_name, _cpu) \ -- 1.7.7.6
| |