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Message-ID: <20221203145559.24763-1-chunfeng.yun@mediatek.com>
Date: Sat, 3 Dec 2022 22:55:57 +0800
From: Chunfeng Yun <chunfeng.yun@...iatek.com>
To: Vinod Koul <vkoul@...nel.org>
CC: Chunfeng Yun <chunfeng.yun@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-phy@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<llvm@...ts.linux.dev>, Eddie Hung <eddie.hung@...iatek.com>,
kernel test robot <lkp@...el.com>
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
checkpatch.pl, 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 <lkp@...el.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
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)); \
})
#endif
--
2.18.0
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