linux-kernel - [PATCH v2 2/5] block/blk-map: Remove redundant assignment

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Date:   Tue, 12 Apr 2022 19:16:48 +0200
From:   Michal Orzel <michalorzel.eng@...il.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>
Cc:     Michal Orzel <michalorzel.eng@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH v2 2/5] block/blk-map: Remove redundant assignment

Get rid of redundant assignment to a variable ret from function
bio_map_user_iov as it is being assigned a value that is never read.
It is being re-assigned in the first instruction after the while loop

Reported by clang-tidy [deadcode.DeadStores]

Signed-off-by: Michal Orzel <michalorzel.eng@...il.com>
---
Changes since v1:
-move the change into a separate patch
-add analysis
---
 block/blk-map.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/block/blk-map.c b/block/blk-map.c
index c7f71d83eff1..fa72e63e18c2 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -260,10 +260,9 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
 
 		npages = DIV_ROUND_UP(offs + bytes, PAGE_SIZE);
 
-		if (unlikely(offs & queue_dma_alignment(rq->q))) {
-			ret = -EINVAL;
+		if (unlikely(offs & queue_dma_alignment(rq->q)))
 			j = 0;
-		} else {
+		else {
 			for (j = 0; j < npages; j++) {
 				struct page *page = pages[j];
 				unsigned int n = PAGE_SIZE - offs;
-- 
2.25.1