The patch titled
PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage
has been added to the -mm tree. Its filename is
percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage
From: Eric Dumazet <dada1@xxxxxxxxxxxxx>
Instead of allocating a fix sized array of NR_CPUS pointers for percpu_data,
we can use nr_cpu_ids, which is generally < NR_CPUS.
Signed-off-by: Eric Dumazet <dada1@xxxxxxxxxxxxx>
Cc: Christoph Lameter <clameter@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/percpu.h | 2 +-
mm/allocpercpu.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff -puN include/linux/percpu.h~percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data include/linux/percpu.h
--- a/include/linux/percpu.h~percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data
+++ a/include/linux/percpu.h
@@ -34,7 +34,7 @@
#ifdef CONFIG_SMP
struct percpu_data {
- void *ptrs[NR_CPUS];
+ void *ptrs[1];
};
#define __percpu_disguise(pdata) (struct percpu_data *)~(unsigned long)(pdata)
diff -puN mm/allocpercpu.c~percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data mm/allocpercpu.c
--- a/mm/allocpercpu.c~percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data
+++ a/mm/allocpercpu.c
@@ -98,7 +98,7 @@ EXPORT_SYMBOL_GPL(__percpu_populate_mask
*/
void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask)
{
- void *pdata = kzalloc(sizeof(struct percpu_data), gfp);
+ void *pdata = kzalloc(nr_cpu_ids * sizeof(void *), gfp);
void *__pdata = __percpu_disguise(pdata);
if (unlikely(!pdata))
_
Patches currently in -mm which might be from dada1@xxxxxxxxxxxxx are
git-net.patch
nr_open-should-be-raised-a-litle-bit.patch
percpu-__percpu_alloc_mask-can-dynamically-size-percpu_data.patch
-
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