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Date: Wed, 1 May 2019 15:53:29 -0700 From: Vineet Gupta <Vineet.Gupta1@...opsys.com> To: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net> CC: <netdev@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>, Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>, Martin KaFai Lau <kafai@...com>, <bpf@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-snps-arc@...ts.infradead.org>, <linux-perf-users@...r.kernel.org>, <arnaldo.melo@...il.com>, Vineet Gupta <Vineet.Gupta1@...opsys.com> Subject: [PATCH] tools/bpf: fix perf build error with uClibc (seen on ARC) When build perf for ARC recently, there was a build failure due to lack of __NR_bpf. | Auto-detecting system features: | | ... get_cpuid: [ OFF ] | ... bpf: [ on ] | | # error __NR_bpf not defined. libbpf does not support your arch. ^~~~~ | bpf.c: In function 'sys_bpf': | bpf.c:66:17: error: '__NR_bpf' undeclared (first use in this function) | return syscall(__NR_bpf, cmd, attr, size); | ^~~~~~~~ | sys_bpf The fix is to define a fallbak __NR_bpf. The obvious fix with be __arc__ specific value, but i think a better fix is to use the asm-generic uapi value applicable to ARC as well as any new arch (hopefully we don't add an old existing arch here). Otherwise I can just add __arc__ Signed-off-by: Vineet Gupta <vgupta@...opsys.com> --- tools/lib/bpf/bpf.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c index 9cd015574e83..2c5eb7928400 100644 --- a/tools/lib/bpf/bpf.c +++ b/tools/lib/bpf/bpf.c @@ -47,7 +47,10 @@ # elif defined(__s390__) # define __NR_bpf 351 # else -# error __NR_bpf not defined. libbpf does not support your arch. +/* + * Any non listed arch (new) will have to asm-generic uapi complient + */ +# define __NR_bpf 280 # endif #endif -- 2.7.4
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