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Message-Id: <20200603233203.1695403-6-keescook@chromium.org>
Date: Wed, 3 Jun 2020 16:31:58 -0700
From: Kees Cook <keescook@...omium.org>
To: linux-kernel@...r.kernel.org
Cc: Kees Cook <keescook@...omium.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
Alexander Potapenko <glider@...gle.com>,
Joe Perches <joe@...ches.com>,
Andy Whitcroft <apw@...onical.com>, x86@...nel.org,
drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
b43-dev@...ts.infradead.org, netdev@...r.kernel.org,
linux-wireless@...r.kernel.org, linux-ide@...r.kernel.org,
linux-clk@...r.kernel.org, linux-spi@...r.kernel.org,
linux-mm@...ck.org, clang-built-linux@...glegroups.com
Subject: [PATCH 05/10] ide: Remove uninitialized_var() usage
Using uninitialized_var() is dangerous as it papers over real bugs[1]
(or can in the future), and suppresses unrelated compiler warnings (e.g.
"unused variable"). If the compiler thinks it is uninitialized, either
simply initialize the variable or make compiler changes. As a precursor
to removing[2] this[3] macro[4], just remove this variable since it was
actually unused:
drivers/ide/ide-taskfile.c:232:34: warning: unused variable 'flags' [-Wunused-variable]
unsigned long uninitialized_var(flags);
^
[1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/
[2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/
[3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/
[4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/ide/ide-taskfile.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index aab6a10435b6..a26f85ab58a9 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -229,7 +229,6 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
struct scatterlist *cursg = cmd->cursg;
- unsigned long uninitialized_var(flags);
struct page *page;
unsigned int offset;
u8 *buf;
--
2.25.1
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