zram: use atomic64_xxx() to replace zram_stat64_xxx()

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Use atomic64_xxx() to replace open-coded zram_stat64_xxx().
Some architectures have native support of atomic64 operations,
so we can get rid of the spin_lock() in zram_stat64_xxx().
On the other hand, for platforms use generic version of atomic64
implement, it may cause an extra save/restore of the interrupt
flag.  So it's a tradeoff.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jiang Liu 2013-06-07 00:07:31 +08:00 • committed by Greg Kroah-Hartman

parent 42e99bd975

commit da5cc7d338

3 changed files with 24 additions and 53 deletions

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37

drivers/staging/zram/zram_drv.c

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19

drivers/staging/zram/zram_drv.h

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21

drivers/staging/zram/zram_sysfs.c

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