linux-kernel - Re: [PATCH] samples/bpf: Fix broken samples.

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Message-ID: <20191002184506.iauttcpgyzcplope@ast-mbp.dhcp.thefacebook.com>
Date:   Wed, 2 Oct 2019 11:45:08 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     KP Singh <kpsingh@...omium.org>
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        Florent Revest <revest@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Florent Revest <revest@...omium.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH] samples/bpf: Fix broken samples.

On Wed, Oct 02, 2019 at 07:46:32PM +0200, KP Singh wrote:
> From: KP Singh <kpsingh@...gle.com>
> 
> Rename asm_goto_workaround.h to asm_workaround.h and add a
> workaround for the newly added "asm_inline" in:
> 
>   commit eb111869301e ("compiler-types.h: add asm_inline definition")
> 
> Add missing include for <linux/perf_event.h> which was removed from
> perf-sys.h in:
> 
>   commit 91854f9a077e ("perf tools: Move everything related to
> 	               sys_perf_event_open() to perf-sys.h")
> 
> Co-developed-by: Florent Revest <revest@...gle.com>
> Signed-off-by: Florent Revest <revest@...gle.com>
> Signed-off-by: KP Singh <kpsingh@...gle.com>
> ---
>  samples/bpf/Makefile                            |  2 +-
>  .../{asm_goto_workaround.h => asm_workaround.h} | 17 ++++++++++++++---
>  samples/bpf/task_fd_query_user.c                |  1 +
>  3 files changed, 16 insertions(+), 4 deletions(-)
>  rename samples/bpf/{asm_goto_workaround.h => asm_workaround.h} (46%)
> 
> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
> index 42b571cde177..ab2b4d7ecb4b 100644
> --- a/samples/bpf/Makefile
> +++ b/samples/bpf/Makefile
> @@ -289,7 +289,7 @@ $(obj)/%.o: $(src)/%.c
>  		-Wno-gnu-variable-sized-type-not-at-end \
>  		-Wno-address-of-packed-member -Wno-tautological-compare \
>  		-Wno-unknown-warning-option $(CLANG_ARCH_ARGS) \
> -		-I$(srctree)/samples/bpf/ -include asm_goto_workaround.h \
> +		-I$(srctree)/samples/bpf/ -include asm_workaround.h \
>  		-O2 -emit-llvm -c $< -o -| $(LLC) -march=bpf $(LLC_FLAGS) -filetype=obj -o $@
>  ifeq ($(DWARF2BTF),y)
>  	$(BTF_PAHOLE) -J $@
> diff --git a/samples/bpf/asm_goto_workaround.h b/samples/bpf/asm_workaround.h
> similarity index 46%
> rename from samples/bpf/asm_goto_workaround.h
> rename to samples/bpf/asm_workaround.h
> index 7409722727ca..7c99ea6ae98c 100644
> --- a/samples/bpf/asm_goto_workaround.h
> +++ b/samples/bpf/asm_workaround.h
> @@ -1,9 +1,10 @@
>  /* SPDX-License-Identifier: GPL-2.0 */
>  /* Copyright (c) 2019 Facebook */
> -#ifndef __ASM_GOTO_WORKAROUND_H
> -#define __ASM_GOTO_WORKAROUND_H
> +#ifndef __ASM_WORKAROUND_H
> +#define __ASM_WORKAROUND_H

I don't think rename is necessary.
This file already has a hack for volatile().
Just add asm_inline hack to it.