linux-kernel - [PATCH bpf-next v2 2/3] selftests/bpf: Check __TARGET_ARCH

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Date:   Fri, 24 Feb 2023 18:36:54 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Cc:     bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next v2 2/3] selftests/bpf: Check __TARGET_ARCH_loongarch if target is bpf for LoongArch

If target is bpf, there is no __loongarch__ definition, __BITS_PER_LONG
defaults to 32, __NR_nanosleep is not defined:

  #if defined(__ARCH_WANT_TIME32_SYSCALLS) || __BITS_PER_LONG != 32
  #define __NR_nanosleep 101
  __SC_3264(__NR_nanosleep, sys_nanosleep_time32, sys_nanosleep)
  #endif

Check __TARGET_ARCH_loongarch to include arch specified bitsperlong.h,
then __BITS_PER_LONG is 64, __NR_nanosleep can also be defined to fix
the following build errors:

  clang  -g -Werror -D__TARGET_ARCH_loongarch ... -target bpf -c progs/test_vmlinux.c ...
  progs/test_vmlinux.c:24:18: error: use of undeclared identifier '__NR_nanosleep'
          if (args->id != __NR_nanosleep)
                          ^
  progs/test_vmlinux.c:42:12: error: use of undeclared identifier '__NR_nanosleep'
          if (id != __NR_nanosleep)
                    ^
  progs/test_vmlinux.c:60:12: error: use of undeclared identifier '__NR_nanosleep'
          if (id != __NR_nanosleep)
                    ^
  3 errors generated.
  make: *** [Makefile:572: tools/testing/selftests/bpf/test_vmlinux.bpf.o] Error 1
  make: Leaving directory 'tools/testing/selftests/bpf'

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 tools/include/uapi/asm/bitsperlong.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/include/uapi/asm/bitsperlong.h b/tools/include/uapi/asm/bitsperlong.h
index da52065..10b4023 100644
--- a/tools/include/uapi/asm/bitsperlong.h
+++ b/tools/include/uapi/asm/bitsperlong.h
@@ -17,7 +17,7 @@
 #include "../../../arch/riscv/include/uapi/asm/bitsperlong.h"
 #elif defined(__alpha__)
 #include "../../../arch/alpha/include/uapi/asm/bitsperlong.h"
-#elif defined(__loongarch__)
+#elif defined(__loongarch__) || defined(__TARGET_ARCH_loongarch)
 #include "../../../arch/loongarch/include/uapi/asm/bitsperlong.h"
 #else
 #include <asm-generic/bitsperlong.h>
-- 
2.1.0