[PATCH next v2] phy: mediatek: fix build warning of FIELD_PREP()

From: Chunfeng Yun
Date: Wed Sep 28 2022 - 03:08:10 EST


Change the inline function mtk_phy_update_field() into a macro to
avoid check warning of FIELD_PREP() with compiler parameter
-Wtautological-constant-out-of-range-compare

the warning is caused by mask check:
"BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) > \"

Fixes: 29c07477556e ("phy: mediatek: add a new helper to update bitfield")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
---
v2: v1 will cause merge conflict, change comment, s/should/shall
---
drivers/phy/mediatek/phy-mtk-io.h | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/phy/mediatek/phy-mtk-io.h b/drivers/phy/mediatek/phy-mtk-io.h
index a723d4afc9b4..d20ad5e5be81 100644
--- a/drivers/phy/mediatek/phy-mtk-io.h
+++ b/drivers/phy/mediatek/phy-mtk-io.h
@@ -36,10 +36,11 @@ static inline void mtk_phy_update_bits(void __iomem *reg, u32 mask, u32 val)
writel(tmp, reg);
}

-/* field @mask should be constant and continuous */
-static inline void mtk_phy_update_field(void __iomem *reg, u32 mask, u32 val)
-{
- mtk_phy_update_bits(reg, mask, FIELD_PREP(mask, 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)); \
+})

#endif
--
2.18.0