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authorDouglas Anderson <dianders@chromium.org>2020-10-16 06:09:43 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 21:11:18 +0300
commit4e79603bbd33aa9600313ae6f887741efbb01456 (patch)
tree798c777e699d285ee548a03055d24c53773eb595 /drivers/block/zram
parentb86c5fc4e71a23e284b7cdfb757fb76534ab4119 (diff)
downloadlinux-4e79603bbd33aa9600313ae6f887741efbb01456.tar.xz
zram: failing to decompress is WARN_ON worthy
If we fail to decompress in zram it's a pretty serious problem. We were entrusted to be able to decompress the old data but we failed. Either we've got some crazy bug in the compression code or we've got memory corruption. At the moment, when this happens the log looks like this: ERR kernel: [ 1833.099861] zram: Decompression failed! err=-22, page=336112 ERR kernel: [ 1833.099881] zram: Decompression failed! err=-22, page=336112 ALERT kernel: [ 1833.099886] Read-error on swap-device (253:0:2688896) It is true that we have an "ALERT" level log in there, but (at least to me) it feels like even this isn't enough to impart the seriousness of this error. Let's convert to a WARN_ON. Note that WARN_ON is automatically "unlikely" so we can simply replace the old annotation with the new one. Signed-off-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Minchan Kim <minchan@kernel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> Cc: Sonny Rao <sonnyrao@chromium.org> Cc: Jens Axboe <axboe@kernel.dk> Link: https://lkml.kernel.org/r/20200917174059.1.If09c882545dbe432268f7a67a4d4cfcb6caace4f@changeid Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block/zram')
-rw-r--r--drivers/block/zram/zram_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index bff3d4021c18..029403c18ca3 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1270,7 +1270,7 @@ static int __zram_bvec_read(struct zram *zram, struct page *page, u32 index,
zram_slot_unlock(zram, index);
/* Should NEVER happen. Return bio error if it does. */
- if (unlikely(ret))
+ if (WARN_ON(ret))
pr_err("Decompression failed! err=%d, page=%u\n", ret, index);
return ret;