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From: Xiao Yang <ice_yangxiao@163.com>
Subject: Question about "asm/rwonce.h: No such file or directory"
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Date: Tue, 12 Nov 2019 16:56:39 +0800
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To: will@kernel.org
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Hi Will,


With your patch[1], I alway get the following error when building tools/bpf:

----------------------------------------------------------------------------------

make -C tools/bpf/
make: Entering directory
'/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/tools/bpf'

Auto-detecting system features:
... libbfd: [ on ]
... disassembler-four-args: [ OFF ]

CC bpf_jit_disasm.o
CC bpf_dbg.o
In file included from
/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/include/uapi/linux/filter.h:9:0,
from
/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/tools/bpf/bpf_dbg.c:41:
/usr/src/perf_selftests-x86_64-rhel-7.6-642a312d47ceb54603630d9d04f5052f3b46d9a3/include/linux/compiler.h:247:24:
fatal error: asm/rwonce.h: No such file or directory
#include <asm/rwonce.h>
^
compilation terminated.
Makefile:61: recipe for target 'bpf_dbg.o' failed
make: *** [bpf_dbg.o] Error 1
make: *** Waiting for unfinished jobs....
make: Leaving directory

----------------------------------------------------------------------------------

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/commit/?h=lto&id=642a312d47ceb54603630d9d04f5052f3b46d9a3


It seems that include/linux/compiler.h cannot find the asm/rwonce.h 
because tools/bpf/Makefile doesn't include 
arch/*/include/generated/asm/rwonce.h.

Did I miss some operations to build tools/bpf?


Best Regards,

XIao Yang