* [PATCH] btrfs: scrub: Remove redundant initialization of increment
@ 2022-01-21 11:42 Jiapeng Chong
2022-01-24 19:43 ` David Sterba
0 siblings, 1 reply; 2+ messages in thread
From: Jiapeng Chong @ 2022-01-21 11:42 UTC (permalink / raw)
To: clm; +Cc: josef, dsterba, linux-btrfs, linux-kernel, Jiapeng Chong, Abaci Robot
increment is being initialized to map->stripe_len but this is never
read as increment is overwritten later on. Remove the redundant
initialization.
Cleans up the following clang-analyzer warning:
fs/btrfs/scrub.c:3193:6: warning: Value stored to 'increment' during its
initialization is never read [clang-analyzer-deadcode.DeadStores].
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
---
fs/btrfs/scrub.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 2e9a322773f2..38f5666eff14 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3209,7 +3209,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
offset = 0;
nstripes = div64_u64(dev_extent_len, map->stripe_len);
mirror_num = 1;
- increment = map->stripe_len;
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
offset = map->stripe_len * stripe_index;
increment = map->stripe_len * map->num_stripes;
--
2.20.1.7.g153144c
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] btrfs: scrub: Remove redundant initialization of increment
2022-01-21 11:42 [PATCH] btrfs: scrub: Remove redundant initialization of increment Jiapeng Chong
@ 2022-01-24 19:43 ` David Sterba
0 siblings, 0 replies; 2+ messages in thread
From: David Sterba @ 2022-01-24 19:43 UTC (permalink / raw)
To: Jiapeng Chong; +Cc: clm, josef, dsterba, linux-btrfs, linux-kernel, Abaci Robot
On Fri, Jan 21, 2022 at 07:42:24PM +0800, Jiapeng Chong wrote:
> increment is being initialized to map->stripe_len but this is never
> read as increment is overwritten later on. Remove the redundant
> initialization.
>
> Cleans up the following clang-analyzer warning:
>
> fs/btrfs/scrub.c:3193:6: warning: Value stored to 'increment' during its
> initialization is never read [clang-analyzer-deadcode.DeadStores].
>
> Reported-by: Abaci Robot <abaci@linux.alibaba.com>
> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
> ---
> fs/btrfs/scrub.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 2e9a322773f2..38f5666eff14 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -3209,7 +3209,6 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
> offset = 0;
> nstripes = div64_u64(dev_extent_len, map->stripe_len);
> mirror_num = 1;
> - increment = map->stripe_len;
I'd rather remove the initialization at the declarataion, the other
values are initialized here so it's all in one place. As is's a minor
change I'll do that at commit time, no need to resend. Thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2022-01-21 11:42 [PATCH] btrfs: scrub: Remove redundant initialization of increment Jiapeng Chong
2022-01-24 19:43 ` David Sterba
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