diff mbox series

dmaengine: qcom: Always inline gpi_update_reg

Message ID 20210112191214.1264793-1-natechancellor@gmail.com (mailing list archive)
State Accepted
Headers show
Series dmaengine: qcom: Always inline gpi_update_reg | expand

Commit Message

Nathan Chancellor Jan. 12, 2021, 7:12 p.m. UTC 
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(-)


base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837

Comments

Vinod Koul Jan. 13, 2021, 11:21 a.m. UTC | #1 
On 12-01-21, 12:12, Nathan Chancellor wrote:
> 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.

Applied, thanks
diff mbox series

Patch

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;