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android_kernel_lge_bullhead/drivers/block/zram
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Mike Snitzer 30046ef03c UPSTREAM: block: disable entropy contributions for nonrot devices 
(cherry picked from commit b277da0a8a594308e17881f4926879bd5fca2a2d)

Clear QUEUE_FLAG_ADD_RANDOM in all block drivers that set
QUEUE_FLAG_NONROT.

Historically, all block devices have automatically made entropy
contributions.  But as previously stated in commit e2e1a148 ("block: add
sysfs knob for turning off disk entropy contributions"):
    - On SSD disks, the completion times aren't as random as they
      are for rotational drives. So it's questionable whether they
      should contribute to the random pool in the first place.
    - Calling add_disk_randomness() has a lot of overhead.

There are more reliable sources for randomness than non-rotational block
devices.  From a security perspective it is better to err on the side of
caution than to allow entropy contributions from unreliable "random"
sources.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
 		2016-02-10 01:37:31 +00:00
..
Kconfig
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Makefile
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zcomp.c UPSTREAM: zram: pass gfp from zcomp frontend to backend 2016-02-10 01:37:10 +00:00
zcomp.h UPSTREAM: zram: pass gfp from zcomp frontend to backend 2016-02-10 01:37:10 +00:00
zcomp_lz4.c UPSTREAM: zram/zcomp: do not zero out zcomp private pages 2016-02-10 01:37:16 +00:00
zcomp_lz4.h
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zcomp_lzo.c UPSTREAM: zram/zcomp: do not zero out zcomp private pages 2016-02-10 01:37:16 +00:00
zcomp_lzo.h
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zram_drv.c UPSTREAM: block: disable entropy contributions for nonrot devices 2016-02-10 01:37:31 +00:00
zram_drv.h
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