On Tue, Jan 20, 2026 at 12:07:23PM -0500, Brian Masney wrote:
> When compiling a driver written for MIPS on OpenRISC that uses the nop()
> function, it fails due to the following error:
>
> drivers/watchdog/pic32-wdt.c: Assembler messages:
> drivers/watchdog/pic32-wdt.c:125: Error: unrecognized instruction `nop'
>
> The driver currently uses the generic version of nop() from
> include/asm-generic/barrier.h:
>
> #ifndef nop
> #define nop() asm volatile ("nop")
> #endif
>
> Let's fix this on OpenRISC by defining an architecture-specific version
> of nop().
>
> This was tested by performing an allmodconfig openrisc cross compile on
> an aarch64 host.
>
> Reported-by: kernel test robot <[email protected]>
> Closes:
> https://lore.kernel.org/oe-kbuild-all/[email protected]/
> Signed-off-by: Brian Masney <[email protected]>
This looks OK to me. Queueing.
-Stafford
> ---
> arch/openrisc/include/asm/barrier.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/openrisc/include/asm/barrier.h
> b/arch/openrisc/include/asm/barrier.h
> index
> 7538294721bed7bc8da3d08f3db89a408091f3f8..8e592c99090235423a9f4c9149da9822918afb13
> 100644
> --- a/arch/openrisc/include/asm/barrier.h
> +++ b/arch/openrisc/include/asm/barrier.h
> @@ -4,6 +4,8 @@
>
> #define mb() asm volatile ("l.msync" ::: "memory")
>
> +#define nop() asm volatile ("l.nop")
> +
> #include <asm-generic/barrier.h>
>
> #endif /* __ASM_BARRIER_H */
>
> ---
> base-commit: d08c85ac8894995d4b0d8fb48d2f6a3e53cd79ab
> change-id: 20260120-openrisc-nop-82b7f95dad7f
>
> Best regards,
> --
> Brian Masney <[email protected]>
>
