The patch titled
Subject: zsmalloc: use bit_spin_lock
has been added to the -mm tree. Its filename is
zsmalloc-use-bit_spin_lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zsmalloc-use-bit_spin_lock.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zsmalloc-use-bit_spin_lock.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zsmalloc: use bit_spin_lock
Use kernel standard bit spin-lock instead of custom mess. Even, it has a
bug which doesn't disable preemption. The reason we don't have any
problem is that we have used it during preemption disable section by
class->lock spinlock. So no need to go to stable.
Link: http://lkml.kernel.org/r/1464736881-24886-6-git-send-email-minchan@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 10 +++-------
1 file changed, 3 insertions(+), 7 deletions(-)
diff -puN mm/zsmalloc.c~zsmalloc-use-bit_spin_lock mm/zsmalloc.c
--- a/mm/zsmalloc.c~zsmalloc-use-bit_spin_lock
+++ a/mm/zsmalloc.c
@@ -868,21 +868,17 @@ static unsigned long obj_idx_to_offset(s
static inline int trypin_tag(unsigned long handle)
{
- unsigned long *ptr = (unsigned long *)handle;
-
- return !test_and_set_bit_lock(HANDLE_PIN_BIT, ptr);
+ return bit_spin_trylock(HANDLE_PIN_BIT, (unsigned long *)handle);
}
static void pin_tag(unsigned long handle)
{
- while (!trypin_tag(handle));
+ bit_spin_lock(HANDLE_PIN_BIT, (unsigned long *)handle);
}
static void unpin_tag(unsigned long handle)
{
- unsigned long *ptr = (unsigned long *)handle;
-
- clear_bit_unlock(HANDLE_PIN_BIT, ptr);
+ bit_spin_unlock(HANDLE_PIN_BIT, (unsigned long *)handle);
}
static void reset_page(struct page *page)
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-use-put_page-to-free-page-instead-of-putback_lru_page.patch
mm-migrate-support-non-lru-movable-page-migration.patch
mm-balloon-use-general-non-lru-movable-page-feature.patch
zsmalloc-keep-max_object-in-size_class.patch
zsmalloc-use-bit_spin_lock.patch
zsmalloc-use-accessor.patch
zsmalloc-factor-page-chain-functionality-out.patch
zsmalloc-introduce-zspage-structure.patch
zsmalloc-separate-free_zspage-from-putback_zspage.patch
zsmalloc-use-freeobj-for-index.patch
zsmalloc-page-migration-support.patch
zram-use-__gfp_movable-for-memory-allocation.patch
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