[PATCH] RISC-V: fix barrier() use in <vdso/processor.h>
Palmer Dabbelt
palmer at dabbelt.com
Fri Nov 20 22:25:31 EST 2020
On Mon, 16 Nov 2020 17:39:51 PST (-0800), rdunlap at 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 allmodconfig now builds cleanly after this patch.
>
> Fixes fallout from:
> 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive")
>
> Fixes: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions")
> Reported-by: Andreas Schwab <schwab at linux-m68k.org>
> Signed-off-by: Randy Dunlap <rdunlap at infradead.org>
> Cc: Andrew Morton <akpm at linux-foundation.org>
> Cc: Stephen Rothwell <sfr at canb.auug.org.au>
> Cc: Arvind Sankar <nivedita at alum.mit.edu>
> Cc: linux-riscv at lists.infradead.org
> Cc: clang-built-linux at googlegroups.com
> Cc: Nick Desaulniers <ndesaulniers at google.com>
> Cc: Nathan Chancellor <natechancellor at gmail.com>
> Cc: Paul Walmsley <paul.walmsley at sifive.com>
> Cc: Palmer Dabbelt <palmer at dabbelt.com>
> Cc: Albert Ou <aou at eecs.berkeley.edu>
> ---
> 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, this is on fixes.
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