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SubjectApplied "spi: work around clang bug in SPI_BPW_RANGE_MASK()" to the spi tree
The patch

spi: work around clang bug in SPI_BPW_RANGE_MASK()

has been applied to the spi tree at

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From eefffb42f6659c9510105f3e4ebf2a8499d56936 Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <>
Date: Thu, 7 Mar 2019 16:54:21 +0100
Subject: [PATCH] spi: work around clang bug in SPI_BPW_RANGE_MASK()

Clang-8 evaluates both sides of a ?: expression to check for
valid arithmetic even in the side that is never taken. This
results in a build warning:

drivers/spi/spi-sh-msiof.c:1052:24: error: shift count >= width of type [-Werror,-Wshift-count-overflow]
.bits_per_word_mask = SPI_BPW_RANGE_MASK(8, 32),

Change the implementation to use the GENMASK() macro that does
what we want here but does not have a problem with the shift
count overflow.

Signed-off-by: Arnd Bergmann <>
Signed-off-by: Mark Brown <>
include/linux/spi/spi.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 662b336aa2e4..b27386450089 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -444,8 +444,7 @@ struct spi_controller {
/* bitmask of supported bits_per_word for transfers */
u32 bits_per_word_mask;
#define SPI_BPW_MASK(bits) BIT((bits) - 1)
-#define SPI_BIT_MASK(bits) (((bits) == 32) ? ~0U : (BIT(bits) - 1))
-#define SPI_BPW_RANGE_MASK(min, max) (SPI_BIT_MASK(max) - SPI_BIT_MASK(min - 1))
+#define SPI_BPW_RANGE_MASK(min, max) GENMASK((min) - 1, (max) - 1)

/* limits on transfer speed */
u32 min_speed_hz;
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