[PATCH bpf-next v2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__ for MIPS to fix build warnings

[PATCH bpf-next v2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__ for MIPS to fix build warnings

[Tiezhu Yang]

There exists many build warnings when make M=samples/bpf on the Loongson
platform, this issue is MIPS related, x86 compiles just fine.

Here are some warnings:

  CC  samples/bpf/ibumad_user.o
samples/bpf/ibumad_user.c: In function ‘dump_counts’:
samples/bpf/ibumad_user.c:46:24: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
    printf("0x%02x : %llu\n", key, value);
                     ~~~^          ~~~~~
                     %lu
  CC  samples/bpf/offwaketime_user.o
samples/bpf/offwaketime_user.c: In function ‘print_ksym’:
samples/bpf/offwaketime_user.c:34:17: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
   printf("%s/%llx;", sym->name, addr);
              ~~~^               ~~~~
              %lx
samples/bpf/offwaketime_user.c: In function ‘print_stack’:
samples/bpf/offwaketime_user.c:68:17: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
  printf(";%s %lld\n", key->waker, count);
              ~~~^                 ~~~~~
              %ld

MIPS needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
'int-ll64.h' in arch/mips/include/uapi/asm/types.h, then it can avoid
build warnings when printing __u64 with %llu, %llx or %lld.

The header tools/include/linux/types.h defines __SANE_USERSPACE_TYPES__,
it seems that we can include <linux/types.h> in the source files which
have build warnings, but it has no effect due to actually it includes
usr/include/linux/types.h instead of tools/include/linux/types.h, the
problem is that "usr/include" is preferred first than "tools/include"
in samples/bpf/Makefile, that sounds like a ugly hack to -Itools/include
before -Iusr/include.

So define __SANE_USERSPACE_TYPES__ for MIPS in samples/bpf/Makefile
is proper, if add "TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__" in
samples/bpf/Makefile, it appears the following error:

Auto-detecting system features:
...                        libelf: [ on  ]
...                          zlib: [ on  ]
...                           bpf: [ OFF ]

BPF API too old
make[3]: *** [Makefile:293: bpfdep] Error 1
make[2]: *** [Makefile:156: all] Error 2

With #ifndef __SANE_USERSPACE_TYPES__  in tools/include/linux/types.h,
the above error has gone and this ifndef change does not hurt other
compilations.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---

v2: Update the commit message

 samples/bpf/Makefile        | 4 ++++
 tools/include/linux/types.h | 3 +++
 2 files changed, 7 insertions(+)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 26fc96c..27de306 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -183,6 +183,10 @@ BPF_EXTRA_CFLAGS := $(ARM_ARCH_SELECTOR)
 TPROGS_CFLAGS += $(ARM_ARCH_SELECTOR)
 endif
 
+ifeq ($(ARCH), mips)
+TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__
+endif
+
 TPROGS_CFLAGS += -Wall -O2
 TPROGS_CFLAGS += -Wmissing-prototypes
 TPROGS_CFLAGS += -Wstrict-prototypes
diff --git a/tools/include/linux/types.h b/tools/include/linux/types.h
index 154eb4e..e9c5a21 100644
--- a/tools/include/linux/types.h
+++ b/tools/include/linux/types.h
@@ -6,7 +6,10 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#ifndef __SANE_USERSPACE_TYPES__
 #define __SANE_USERSPACE_TYPES__	/* For PPC64, to get LL64 types */
+#endif
+
 #include <asm/types.h>
 #include <asm/posix_types.h>
 
-- 
2.1.0

Re: [PATCH bpf-next v2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__ for MIPS to fix build warnings

[Yonghong Song]

On 1/24/21 9:05 PM, Tiezhu Yang wrote:
> There exists many build warnings when make M=samples/bpf on the Loongson
> platform, this issue is MIPS related, x86 compiles just fine.
> 
> Here are some warnings:
> 
>    CC  samples/bpf/ibumad_user.o
> samples/bpf/ibumad_user.c: In function ‘dump_counts’:
> samples/bpf/ibumad_user.c:46:24: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>      printf("0x%02x : %llu\n", key, value);
>                       ~~~^          ~~~~~
>                       %lu
>    CC  samples/bpf/offwaketime_user.o
> samples/bpf/offwaketime_user.c: In function ‘print_ksym’:
> samples/bpf/offwaketime_user.c:34:17: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>     printf("%s/%llx;", sym->name, addr);
>                ~~~^               ~~~~
>                %lx
> samples/bpf/offwaketime_user.c: In function ‘print_stack’:
> samples/bpf/offwaketime_user.c:68:17: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>    printf(";%s %lld\n", key->waker, count);
>                ~~~^                 ~~~~~
>                %ld
> 
> MIPS needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
> 'int-ll64.h' in arch/mips/include/uapi/asm/types.h, then it can avoid
> build warnings when printing __u64 with %llu, %llx or %lld.
> 
> The header tools/include/linux/types.h defines __SANE_USERSPACE_TYPES__,
> it seems that we can include <linux/types.h> in the source files which
> have build warnings, but it has no effect due to actually it includes
> usr/include/linux/types.h instead of tools/include/linux/types.h, the
> problem is that "usr/include" is preferred first than "tools/include"
> in samples/bpf/Makefile, that sounds like a ugly hack to -Itools/include
> before -Iusr/include.
> 
> So define __SANE_USERSPACE_TYPES__ for MIPS in samples/bpf/Makefile
> is proper, if add "TPROGS_CFLAGS += -D__SANE_USERSPACE_TYPES__" in
> samples/bpf/Makefile, it appears the following error:
> 
> Auto-detecting system features:
> ...                        libelf: [ on  ]
> ...                          zlib: [ on  ]
> ...                           bpf: [ OFF ]
> 
> BPF API too old
> make[3]: *** [Makefile:293: bpfdep] Error 1
> make[2]: *** [Makefile:156: all] Error 2
> 
> With #ifndef __SANE_USERSPACE_TYPES__  in tools/include/linux/types.h,
> the above error has gone and this ifndef change does not hurt other
> compilations.
> 
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Acked-by: Yonghong Song <yhs@fb.com>

Re: [PATCH bpf-next v2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__ for MIPS to fix build warnings

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (refs/heads/master):

On Mon, 25 Jan 2021 13:05:46 +0800 you wrote:
> There exists many build warnings when make M=samples/bpf on the Loongson
> platform, this issue is MIPS related, x86 compiles just fine.
> 
> Here are some warnings:
> 
>   CC  samples/bpf/ibumad_user.o
> samples/bpf/ibumad_user.c: In function ‘dump_counts’:
> samples/bpf/ibumad_user.c:46:24: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>     printf("0x%02x : %llu\n", key, value);
>                      ~~~^          ~~~~~
>                      %lu
>   CC  samples/bpf/offwaketime_user.o
> samples/bpf/offwaketime_user.c: In function ‘print_ksym’:
> samples/bpf/offwaketime_user.c:34:17: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>    printf("%s/%llx;", sym->name, addr);
>               ~~~^               ~~~~
>               %lx
> samples/bpf/offwaketime_user.c: In function ‘print_stack’:
> samples/bpf/offwaketime_user.c:68:17: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 3 has type ‘__u64’ {aka ‘long unsigned int’} [-Wformat=]
>   printf(";%s %lld\n", key->waker, count);
>               ~~~^                 ~~~~~
>               %ld
> 
> [...]

Here is the summary with links:
  - [bpf-next,v2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__ for MIPS to fix build warnings
    https://git.kernel.org/bpf/bpf-next/c/190d1c921ad0

You are awesome, thank you!
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