From: Arnd Bergmann Date: Wed, 19 Jun 2019 13:19:44 +0000 (+0200) Subject: floppy: fix harmless clang build warning X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=2af47c10e80baf91cff56c44cec47402e05ac45c;p=openwrt%2Fstaging%2Fblogic.git floppy: fix harmless clang build warning clang warns about unusual code in floppy.c that looks like it was intended to be a bit mask operation, checking for a specific bit in the UDP->cmos variable (FLOPPY1_TYPE expands to '4' on ARM): drivers/block/floppy.c:3902:17: error: use of logical '&&' with constant operand [-Werror,-Wconstant-logical-operand] if (!UDP->cmos && FLOPPY1_TYPE) ^ ~~~~~~~~~~~~ drivers/block/floppy.c:3902:17: note: use '&' for a bitwise operation if (!UDP->cmos && FLOPPY1_TYPE) The check here is redundant anyway, if FLOPPY1_TYPE is zero, then assigning it to a zero UDP->cmos field does not change anything, so removing the extra check here has no effect other than shutting up the warning. On x86, this will no longer read a hardware register, as the FLOPPY1_TYPE macro is not expanded if UDP->cmos is already zero, but the result is the same. Cc: Robert Elliott Cc: Keith Busch Link: https://patchwork.kernel.org/patch/10851841/ Signed-off-by: Arnd Bergmann Signed-off-by: Jens Axboe --- diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c index 9fb9b312ab6b..b933a7eea52b 100644 --- a/drivers/block/floppy.c +++ b/drivers/block/floppy.c @@ -3900,7 +3900,7 @@ static void __init config_types(void) if (!UDP->cmos) UDP->cmos = FLOPPY0_TYPE; drive = 1; - if (!UDP->cmos && FLOPPY1_TYPE) + if (!UDP->cmos) UDP->cmos = FLOPPY1_TYPE; /* FIXME: additional physical CMOS drive detection should go here */