linux-kernel - [PATCH] misc: mic: scif: Remove unused variable

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Date:   Wed, 19 Sep 2018 12:50:22 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Sudeep Dutt <sudeep.dutt@...el.com>,
        Ashutosh Dixit <ashutosh.dixit@...el.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] misc: mic: scif: Remove unused variable

Clang warns when a variable is assigned to itself.

drivers/misc/mic/scif/scif_dma.c:1577:12: warning: explicitly assigning
value of variable of type 'bool' (aka '_Bool') to itself [-Wself-assign]
        dst_local = dst_local;
        ~~~~~~~~~ ^ ~~~~~~~~~
1 warning generated.

This is usually done to avoid an unused variable warning, which is the
case here. dst_local is used nowhere in this function, which has been
the case since the initial code drop in commit 7cc31cd27752 ("misc: mic:
SCIF DMA and CPU copy interface") in 2015. Just remove the variable, it
can be added back if it was intended to be used.

Link: https://github.com/ClangBuiltLinux/linux/issues/107
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/misc/mic/scif/scif_dma.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/misc/mic/scif/scif_dma.c b/drivers/misc/mic/scif/scif_dma.c
index 6369aeaa7056..03af8b5b7b0d 100644
--- a/drivers/misc/mic/scif/scif_dma.c
+++ b/drivers/misc/mic/scif/scif_dma.c
@@ -1553,7 +1553,7 @@ static int scif_rma_list_dma_copy_wrapper(struct scif_endpt *epd,
 	int src_cache_off, dst_cache_off;
 	s64 src_offset = work->src_offset, dst_offset = work->dst_offset;
 	u8 *temp = NULL;
-	bool src_local = true, dst_local = false;
+	bool src_local = true;
 	struct scif_dma_comp_cb *comp_cb;
 	dma_addr_t src_dma_addr, dst_dma_addr;
 	int err;
@@ -1572,9 +1572,7 @@ static int scif_rma_list_dma_copy_wrapper(struct scif_endpt *epd,
 	src_dma_addr = __scif_off_to_dma_addr(work->src_window, src_offset);
 	dst_dma_addr = __scif_off_to_dma_addr(work->dst_window, dst_offset);
 	src_local = work->src_window->type == SCIF_WINDOW_SELF;
-	dst_local = work->dst_window->type == SCIF_WINDOW_SELF;
 
-	dst_local = dst_local;
 	/* Allocate dma_completion cb */
 	comp_cb = kzalloc(sizeof(*comp_cb), GFP_KERNEL);
 	if (!comp_cb)
-- 
2.19.0