[PATCH bpf-next v3] selftests/bpf: Set __BITS_PER_LONG if target is bpf for LoongArch

[PATCH bpf-next v3] selftests/bpf: Set __BITS_PER_LONG if target is bpf for LoongArch

[Tiezhu Yang]

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

Work around this problem, by explicitly setting __BITS_PER_LONG to
__loongarch_grlen which is defined by compiler as 64 for LA64, then
__NR_nanosleep can also be defined to fix the following build errors:

  clang  -g -Werror ... -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.

This is similar with commit 36e70b9b06bf ("selftests, bpf: Fix broken
riscv build").

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 tools/testing/selftests/bpf/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index b677dcd..f40606a 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -338,7 +338,8 @@ $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids	\
 define get_sys_includes
 $(shell $(1) $(2) -v -E - </dev/null 2>&1 \
 	| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
-$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
+$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}') \
+$(shell $(1) $(2) -dM -E - </dev/null | grep '__loongarch_grlen ' | awk '{printf("-D__BITS_PER_LONG=%d", $$3)}')
 endef
 
 # Determine target endianness.
-- 
2.1.0

Re: [PATCH bpf-next v3] selftests/bpf: Set __BITS_PER_LONG if target is bpf for LoongArch

[Andrii Nakryiko]

On Tue, Feb 28, 2023 at 4:03 AM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
> 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
>
> Work around this problem, by explicitly setting __BITS_PER_LONG to
> __loongarch_grlen which is defined by compiler as 64 for LA64, then
> __NR_nanosleep can also be defined to fix the following build errors:
>
>   clang  -g -Werror ... -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.

Not clear what __NR_nanosleep part has to do with this commit. I
dropped this part from the commit message. Applied to bpf-next.

>
> This is similar with commit 36e70b9b06bf ("selftests, bpf: Fix broken
> riscv build").
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>  tools/testing/selftests/bpf/Makefile | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
> index b677dcd..f40606a 100644
> --- a/tools/testing/selftests/bpf/Makefile
> +++ b/tools/testing/selftests/bpf/Makefile
> @@ -338,7 +338,8 @@ $(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids        \
>  define get_sys_includes
>  $(shell $(1) $(2) -v -E - </dev/null 2>&1 \
>         | sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
> -$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
> +$(shell $(1) $(2) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}') \
> +$(shell $(1) $(2) -dM -E - </dev/null | grep '__loongarch_grlen ' | awk '{printf("-D__BITS_PER_LONG=%d", $$3)}')
>  endef
>
>  # Determine target endianness.
> --
> 2.1.0
>

Re: [PATCH bpf-next v3] selftests/bpf: Set __BITS_PER_LONG if target is bpf for LoongArch

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue, 28 Feb 2023 20:03:01 +0800 you wrote:
> 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
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] selftests/bpf: Set __BITS_PER_LONG if target is bpf for LoongArch
    https://git.kernel.org/bpf/bpf-next/c/be35f4af719c

You are awesome, thank you!
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