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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, 2023-01-13 at 10:36 -0800, Nick Desaulniers wrote: > On Wed, Jan 4, 2023 at 5:26 AM Chunfeng Yun < > chunfeng.yun@mediatek.com> wrote: > > > > 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)" > > Can you please include the text of the observed warning? > > > > > 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()") > > Uh, why was 84513eccd678 sent/reviewed/merged if it didn't fix the > issue correctly in the first place? > > Is the issue perhaps that your mask isn't wide enough in the first > place, and should be? See: > commit cfd6fb45cfaf ("crypto: ccree - avoid out-of-range warnings > from clang") > for inspiration. I look at this patch, it said that " This does not happen in other places that just pass a constant here. " That's indeed true, no such warning before using FIELD_PREP() due to the masks are always constant. So seems that it can fix the waring if avoid using a temporary variable @mask_. Thanks a lot > > > Reported-by: kernel test robot > > Can you please include the Link: tag to the lore URL of the report? > > > Signed-off-by: Chunfeng Yun > > --- > > v6: modify the title > > 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 > > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel