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Date: Fri, 19 Jun 2009 11:34:56 +0900
From: Tejun Heo <tj@...nel.org>
To: Linux Kernel <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...e.hu>,
Mike Frysinger <vapier@...too.org>,
Tony Luck <tony.luck@...el.com>,
Andy Grover <andy.grover@...cle.com>
Subject: [PATCH] percpu: use DEFINE_PER_CPU_SHARED_ALIGNED()
There are a few places where ___cacheline_aligned* is used with
DEFINE_PER_CPU(). Use DEFINE_PER_CPU_SHARED_ALIGNED() instead.
DEFINE_PER_CPU_SHARED_ALIGNED() applies alignment only on SMPs. While
all other converted places used _in_smp variant or only get compiled
for SMP, net/rds used unconditional ____cacheline_aligned. I don't
see any reason these data structures should be aligned on UP and thus
converted together.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Mike Frysinger <vapier@...too.org>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Andy Grover <andy.grover@...cle.com>
---
I committed the following patch to percpu#for-next git tree. Please
let me know if something doesn't look right.
git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu.git for-next
http://git.kernel.org/?p=linux/kernel/git/tj/percpu.git;a=shortlog;h=for-next
Thanks.
arch/blackfin/mm/sram-alloc.c | 6 +++---
arch/ia64/kernel/smp.c | 3 ++-
kernel/sched.c | 4 ++--
net/rds/ib_stats.c | 2 +-
net/rds/iw_stats.c | 2 +-
net/rds/page.c | 2 +-
6 files changed, 10 insertions(+), 9 deletions(-)
Index: work/arch/blackfin/mm/sram-alloc.c
===================================================================
--- work.orig/arch/blackfin/mm/sram-alloc.c
+++ work/arch/blackfin/mm/sram-alloc.c
@@ -42,9 +42,9 @@
#include <asm/mem_map.h>
#include "blackfin_sram.h"
-static DEFINE_PER_CPU(spinlock_t, l1sram_lock) ____cacheline_aligned_in_smp;
-static DEFINE_PER_CPU(spinlock_t, l1_data_sram_lock) ____cacheline_aligned_in_smp;
-static DEFINE_PER_CPU(spinlock_t, l1_inst_sram_lock) ____cacheline_aligned_in_smp;
+static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1sram_lock);
+static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_data_sram_lock);
+static DEFINE_PER_CPU_SHARED_ALIGNED(spinlock_t, l1_inst_sram_lock);
static spinlock_t l2_sram_lock ____cacheline_aligned_in_smp;
/* the data structure for L1 scratchpad and DATA SRAM */
Index: work/arch/ia64/kernel/smp.c
===================================================================
--- work.orig/arch/ia64/kernel/smp.c
+++ work/arch/ia64/kernel/smp.c
@@ -58,7 +58,8 @@ static struct local_tlb_flush_counts {
unsigned int count;
} __attribute__((__aligned__(32))) local_tlb_flush_counts[NR_CPUS];
-static DEFINE_PER_CPU(unsigned short [NR_CPUS], shadow_flush_counts) ____cacheline_aligned;
+static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned short [NR_CPUS],
+ shadow_flush_counts);
#define IPI_CALL_FUNC 0
#define IPI_CPU_STOP 1
Index: work/kernel/sched.c
===================================================================
--- work.orig/kernel/sched.c
+++ work/kernel/sched.c
@@ -318,12 +318,12 @@ struct task_group root_task_group;
/* Default task group's sched entity on each cpu */
static DEFINE_PER_CPU(struct sched_entity, init_sched_entity);
/* Default task group's cfs_rq on each cpu */
-static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp;
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct cfs_rq, init_cfs_rq);
#endif /* CONFIG_FAIR_GROUP_SCHED */
#ifdef CONFIG_RT_GROUP_SCHED
static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity);
-static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp;
+static DEFINE_PER_CPU_SHARED_ALIGNED(struct rt_rq, init_rt_rq);
#endif /* CONFIG_RT_GROUP_SCHED */
#else /* !CONFIG_USER_SCHED */
#define root_task_group init_task_group
Index: work/net/rds/ib_stats.c
===================================================================
--- work.orig/net/rds/ib_stats.c
+++ work/net/rds/ib_stats.c
@@ -37,7 +37,7 @@
#include "rds.h"
#include "ib.h"
-DEFINE_PER_CPU(struct rds_ib_statistics, rds_ib_stats) ____cacheline_aligned;
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
static char *rds_ib_stat_names[] = {
"ib_connect_raced",
Index: work/net/rds/iw_stats.c
===================================================================
--- work.orig/net/rds/iw_stats.c
+++ work/net/rds/iw_stats.c
@@ -37,7 +37,7 @@
#include "rds.h"
#include "iw.h"
-DEFINE_PER_CPU(struct rds_iw_statistics, rds_iw_stats) ____cacheline_aligned;
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_iw_statistics, rds_iw_stats);
static char *rds_iw_stat_names[] = {
"iw_connect_raced",
Index: work/net/rds/page.c
===================================================================
--- work.orig/net/rds/page.c
+++ work/net/rds/page.c
@@ -39,7 +39,7 @@ struct rds_page_remainder {
unsigned long r_offset;
};
-DEFINE_PER_CPU(struct rds_page_remainder, rds_page_remainders) ____cacheline_aligned;
+DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_page_remainder, rds_page_remainders);
/*
* returns 0 on success or -errno on failure.
--
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