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SubjectRe: [PATCH v2] RISC-V: fix barrier() use in <vdso/processor.h>
On Tue, Nov 17, 2020 at 11:31 AM Randy Dunlap <rdunlap@infradead.org> wrote:
>
> riscv's <vdso/processor.h> uses barrier() so it should
> #include <asm/barrier.h> to prevent build errors.
>
> Fixes this build error:
> CC [M] drivers/net/ethernet/emulex/benet/be_main.o
> In file included from ./include/vdso/processor.h:10,
> from ./arch/riscv/include/asm/processor.h:11,
> from ./include/linux/prefetch.h:15,
> from drivers/net/ethernet/emulex/benet/be_main.c:14:
> ./arch/riscv/include/asm/vdso/processor.h: In function 'cpu_relax':
> ./arch/riscv/include/asm/vdso/processor.h:14:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration]
> 14 | barrier();
>
> This happens with a total of 5 networking drivers -- they all use
> <linux/prefetch.h>.
>
> rv64 and rv32 allmodconfig now build cleanly after this patch.
>
> Fixes: 3347acc6fcd4 ("compiler.h: fix barrier_data() on clang")
> Fixes: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions")
> Reported-by: Andreas Schwab <schwab@linux-m68k.org>
> Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Stephen Rothwell <sfr@canb.auug.org.au>
> Cc: Arvind Sankar <nivedita@alum.mit.edu>
> Cc: linux-riscv@lists.infradead.org
> Cc: clang-built-linux@googlegroups.com
> Cc: Nick Desaulniers <ndesaulniers@google.com>
> Cc: Nathan Chancellor <natechancellor@gmail.com>
> Cc: Paul Walmsley <paul.walmsley@sifive.com>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Albert Ou <aou@eecs.berkeley.edu>

Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://github.com/ClangBuiltLinux/linux/issues/1202

> ---
> v2: update Fixes: tags (Nick);
> also built allmodconfig cleanly on rv32;
>
> arch/riscv/include/asm/vdso/processor.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> --- lnx-510-rc4.orig/arch/riscv/include/asm/vdso/processor.h
> +++ lnx-510-rc4/arch/riscv/include/asm/vdso/processor.h
> @@ -4,6 +4,8 @@
>
> #ifndef __ASSEMBLY__
>
> +#include <asm/barrier.h>
> +
> static inline void cpu_relax(void)
> {
> #ifdef __riscv_muldiv



--
Thanks,
~Nick Desaulniers

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