Messages in this thread | | | Subject | Re: [PATCH 2/2] compiler.h: Include asm/rwonce.h under ARM64 and ALPHA to fix build errors | From | Yonghong Song <> | Date | Wed, 13 Jan 2021 09:14:47 -0800 |
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On 1/13/21 2:57 AM, Tiezhu Yang wrote: > 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@loongson.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
I do not think this fix is correct. x86 does not define its own rwonce.h and still compiles fine.
As noted in the above, we have include/asm-generic/rwonce.h. Once you do a proper build, you will have rwonce.h in arch generated directory like
-bash-4.4$ find . -name rwonce.h ./include/asm-generic/rwonce.h ./arch/alpha/include/asm/rwonce.h ./arch/arm64/include/asm/rwonce.h ./arch/x86/include/generated/asm/rwonce.h
for mips, it should generated in arch/mips/include/generated/asm/rwonce.h. Please double check why this does not happen.
> > #endif /* __LINUX_COMPILER_H */ >
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