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From:   Nathan Chancellor <natechancellor@gmail.com>
To:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Vinod Koul <vkoul@kernel.org>
Cc:     Dan Williams <dan.j.williams@intel.com>,
        Nick Desaulniers <ndesaulniers@google.com>,
        linux-arm-msm@vger.kernel.org, dmaengine@vger.kernel.org,
        linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
        Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH] dmaengine: qcom: Always inline gpi_update_reg
Date:   Tue, 12 Jan 2021 12:12:14 -0700
Message-Id: <20210112191214.1264793-1-natechancellor@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

When building with CONFIG_UBSAN_UNSIGNED_OVERFLOW, clang decides not to
inline gpi_update_reg, which causes a linkage failure around __bad_mask:

ld.lld: error: undefined symbol: __bad_mask
>>> referenced by bitfield.h:119 (include/linux/bitfield.h:119)
>>>               dma/qcom/gpi.o:(gpi_update_reg) in archive drivers/built-in.a
>>> referenced by bitfield.h:119 (include/linux/bitfield.h:119)
>>>               dma/qcom/gpi.o:(gpi_update_reg) in archive drivers/built-in.a

If gpi_update_reg is not inlined, the mask value will not be known at
compile time so the check in field_multiplier stays in the final
object file, causing the above linkage failure. Always inline
gpi_update_reg so that this check can never fail.

Fixes: 5d0c3533a19f ("dmaengine: qcom: Add GPI dma driver")
Link: https://github.com/ClangBuiltLinux/linux/issues/1243
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/dma/qcom/gpi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/gpi.c b/drivers/dma/qcom/gpi.c
index 1a0bf6b0567a..e48eb397f433 100644
--- a/drivers/dma/qcom/gpi.c
+++ b/drivers/dma/qcom/gpi.c
@@ -584,7 +584,7 @@ static inline void gpi_write_reg_field(struct gpii *gpii, void __iomem *addr,
 	gpi_write_reg(gpii, addr, val);
 }
 
-static inline void
+static __always_inline void
 gpi_update_reg(struct gpii *gpii, u32 offset, u32 mask, u32 val)
 {
 	void __iomem *addr = gpii->regs + offset;

base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837
-- 
2.30.0