linux-kernel - [PATCH 2/2] compiler.h: Include asm/rwonce.h under ARM64 and ALPHA to fix build errors

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Date:   Wed, 13 Jan 2021 18:57:33 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Nathan Chancellor <natechancellor@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     linux-sparse@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: [PATCH 2/2] compiler.h: Include asm/rwonce.h under ARM64 and ALPHA to fix build errors

When make M=samples/bpf on the Loongson 3A3000 platform which
belongs to MIPS arch, there exists many similar build errors
about 'asm/rwonce.h' file not found, so include it only under
CONFIG_ARM64 and CONFIG_ALPHA due to it exists only in arm64
and alpha arch.

  CLANG-bpf  samples/bpf/xdpsock_kern.o
In file included from samples/bpf/xdpsock_kern.c:2:
In file included from ./include/linux/bpf.h:9:
In file included from ./include/linux/workqueue.h:9:
In file included from ./include/linux/timer.h:5:
In file included from ./include/linux/list.h:9:
In file included from ./include/linux/kernel.h:10:
./include/linux/compiler.h:246:10: fatal error: 'asm/rwonce.h' file not found
         ^~~~~~~~~~~~~~
1 error generated.

$ find . -name rwonce.h
./include/asm-generic/rwonce.h
./arch/arm64/include/asm/rwonce.h
./arch/alpha/include/asm/rwonce.h

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 include/linux/compiler.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index b8fe0c2..bdbe759 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -243,6 +243,12 @@ static inline void *offset_to_ptr(const int *off)
  */
 #define prevent_tail_call_optimization()	mb()
 
+#ifdef CONFIG_ARM64
 #include <asm/rwonce.h>
+#endif
+
+#ifdef CONFIG_ALPHA
+#include <asm/rwonce.h>
+#endif
 
 #endif /* __LINUX_COMPILER_H */
-- 
2.1.0