Messages in this thread Patch in this message | | | From | Minchan Kim <> | Subject | [PATCH v4 05/12] zsmalloc: use bit_spin_lock | Date | Wed, 27 Apr 2016 16:48:18 +0900 |
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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.
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Minchan Kim <minchan@kernel.org> --- mm/zsmalloc.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 8649d0243e6c..d75d9e4b6a4d 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -864,21 +864,17 @@ static unsigned long obj_idx_to_offset(struct page *page, 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) -- 1.9.1
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