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Message-ID: <e3eb5919-4573-4576-e6aa-bd8ff56409ed@fb.com>
Date: Wed, 13 Jan 2021 09:12:03 -0800
From: Yonghong Song <yhs@...com>
To: Tiezhu Yang <yangtiezhu@...ngson.cn>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Martin KaFai Lau <kafai@...com>,
Song Liu <songliubraving@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...nel.org>,
Nathan Chancellor <natechancellor@...il.com>,
Nick Desaulniers <ndesaulniers@...gle.com>
CC: <linux-sparse@...r.kernel.org>, <netdev@...r.kernel.org>,
<bpf@...r.kernel.org>, <clang-built-linux@...glegroups.com>,
<linux-mips@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH bpf 1/2] samples/bpf: Set flag __SANE_USERSPACE_TYPES__
for MIPS to fix build warnings
On 1/13/21 2:57 AM, Tiezhu Yang wrote:
> MIPS needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
> 'int-ll64.h' in arch/mips/include/uapi/asm/types.h and avoid compile
> warnings when printing __u64 with %llu, %llx or %lld.
could you mention which command produces the following warning?
>
> printf("0x%02x : %llu\n", key, value);
> ~~~^ ~~~~~
> %lu
> printf("%s/%llx;", sym->name, addr);
> ~~~^ ~~~~
> %lx
> printf(";%s %lld\n", key->waker, count);
> ~~~^ ~~~~~
> %ld
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
> 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
> +
This change looks okay based on description in
arch/mips/include/uapi/asm/types.h
'''
/*
* We don't use int-l64.h for the kernel anymore but still use it for
* userspace to avoid code changes.
*
* However, some user programs (e.g. perf) may not want this. They can
* flag __SANE_USERSPACE_TYPES__ to get int-ll64.h here.
*/
'''
> 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
What problem this patch fixed? If this header is used, you can just
change comment from "PPC64" to "PPC64/MIPS", right?
> +
> #include <asm/types.h>
> #include <asm/posix_types.h>
>
>
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