linux-kernel - Re: [PATCH 03/17] um: don't generate asm/bpf_perf

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Message-ID: <20240705222616.017b1593@canb.auug.org.au>
Date: Fri, 5 Jul 2024 22:26:16 +1000
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Arnd Bergmann <arnd@...nel.org>
Cc: linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Masahiro
 Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>,
 Nicolas Schier <nicolas@...sle.eu>, Vineet Gupta <vgupta@...nel.org>,
 Russell King <linux@...linux.org.uk>, Catalin Marinas
 <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Guo Ren
 <guoren@...nel.org>, Brian Cain <bcain@...cinc.com>, Huacai Chen
 <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, Dinh Nguyen
 <dinguyen@...nel.org>, Jonas Bonn <jonas@...thpole.se>, Stefan Kristiansson
 <stefan.kristiansson@...nalahti.fi>, Stafford Horne <shorne@...il.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, Rich Felker
 <dalias@...c.org>, John Paul Adrian Glaubitz
 <glaubitz@...sik.fu-berlin.de>, "David S. Miller" <davem@...emloft.net>,
 Andreas Larsson <andreas@...sler.com>, Christian Brauner
 <brauner@...nel.org>, Mark Rutland <mark.rutland@....com>,
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-snps-arc@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
 loongarch@...ts.linux.dev, linux-openrisc@...r.kernel.org,
 linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 03/17] um: don't generate asm/bpf_perf_event.h

Hi Arnd,

On Thu,  4 Jul 2024 16:35:57 +0200 Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
> 
> If we start validating the existence of the asm-generic side of
> generated headers, this one causes a warning:
> 
> make[3]: *** No rule to make target 'arch/um/include/generated/asm/bpf_perf_event.h', needed by 'all'.  Stop.
> 
> The problem is that the asm-generic header only exists for the uapi
> variant, but arch/um has no uapi headers and instead uses the x86
> userspace API.
> 
> Add a custom file with an explicit redirect to avoid this.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  arch/um/include/asm/Kbuild           | 1 -
>  arch/um/include/asm/bpf_perf_event.h | 3 +++
>  2 files changed, 3 insertions(+), 1 deletion(-)
>  create mode 100644 arch/um/include/asm/bpf_perf_event.h
> 
> diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
> index 6fe34779291a..6c583040537c 100644
> --- a/arch/um/include/asm/Kbuild
> +++ b/arch/um/include/asm/Kbuild
> @@ -1,5 +1,4 @@
>  # SPDX-License-Identifier: GPL-2.0
> -generic-y += bpf_perf_event.h
>  generic-y += bug.h
>  generic-y += compat.h
>  generic-y += current.h
> diff --git a/arch/um/include/asm/bpf_perf_event.h b/arch/um/include/asm/bpf_perf_event.h
> new file mode 100644
> index 000000000000..0a30420c83de
> --- /dev/null
> +++ b/arch/um/include/asm/bpf_perf_event.h
> @@ -0,0 +1,3 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#include <asm-generic/bpf_perf_event.h>

Just wondering if that file should have some explanatory comment in it
to prevent it being cleaned up in a few years ... or at least to
explain why it causes the above error when removed.

-- 
Cheers,
Stephen Rothwell

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