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Subject[PATCH v5 1/3] phy: mediatek: fix build warning caused by clang for powerpc
Remove the temporary @mask_, this may cause build warning when use clang
compiler for powerpc, but can't reproduce it when compile for arm64.
the build warning is -Wtautological-constant-out-of-range-compare, and
caused by
"BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask)"

After removing @mask_, there is a "CHECK:MACRO_ARG_REUSE" when run, due to @mask is constant, no reuse problem will happen.

Fixes: 84513eccd678 ("phy: mediatek: fix build warning of FIELD_PREP()")
Reported-by: kernel test robot <>
Signed-off-by: Chunfeng Yun <>
v5: no changes
v4 new patch, I'm not sure it can fix build warning, due to I don't cross compile
it for powerpc using clang in office.
drivers/phy/mediatek/phy-mtk-io.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-io.h b/drivers/phy/mediatek/phy-mtk-io.h
index d20ad5e5be81..58f06db822cb 100644
--- a/drivers/phy/mediatek/phy-mtk-io.h
+++ b/drivers/phy/mediatek/phy-mtk-io.h
@@ -39,8 +39,8 @@ static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
/* field @mask shall be constant and continuous */
#define mtk_phy_update_field(reg, mask, val) \
({ \
- typeof(mask) mask_ = (mask); \
- mtk_phy_update_bits(reg, mask_, FIELD_PREP(mask_, val)); \
+ BUILD_BUG_ON_MSG(!__builtin_constant_p(mask), "mask is not constant"); \
+ mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, val)); \

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