linux-kernel - Re: [PATCH v3 2/2] arm64/sve: <uapi/asm/ptrace.h> should not depend on <uapi/linux/prctl.h>

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Message-ID: <20190618135046.GH31041@fuggles.cambridge.arm.com>
Date:   Tue, 18 Jun 2019 14:50:46 +0100
From:   Will Deacon <will.deacon@....com>
To:     Anisse Astier <aastier@...ebox.fr>
Cc:     Dave Martin <Dave.Martin@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Catalin Marinas <catalin.marinas@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Richard Henderson <richard.henderson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org, Rich Felker <dalias@...ifal.cx>,
        "Dmitry V . Levin" <ldv@...linux.org>,
        Ricardo Salveti <ricardo@...ndries.io>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH v3 2/2] arm64/sve: <uapi/asm/ptrace.h> should not depend
 on <uapi/linux/prctl.h>

On Mon, Jun 17, 2019 at 03:22:22PM +0200, Anisse Astier wrote:
> Otherwise this will create userspace build issues for any program
> (strace, qemu) that includes both <sys/prctl.h> (with musl libc) and
> <linux/ptrace.h> (which then includes <asm/ptrace.h>), like this:
> 
> 	error: redefinition of 'struct prctl_mm_map'
> 	 struct prctl_mm_map {
> 
> See https://github.com/foundriesio/meta-lmp/commit/6d4a106e191b5d79c41b9ac78fd321316d3013c0
> for a public example of people working around this issue.
> 
> Copying the defines is a bit imperfect here, but better than creating a
> whole other header for just two defines that would never change, as part
> of the kernel ABI.
> 
> This patch depends on patch "arm64: ssbd: explicitly depend on
> <linux/prctl.h>" for kernel >= 4.18
> 
> Fixes: 43d4da2c45b2 ("arm64/sve: ptrace and ELF coredump support")
> Cc: stable@...r.kernel.org
> Signed-off-by: Anisse Astier <aastier@...ebox.fr>
> ---
>  arch/arm64/include/uapi/asm/ptrace.h | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)

I've pushed these two out to the arm64 fixes branch [1], with Dave's Ack
on this one. Note that I reworked the commit messages a bit to explain
better what's going on.

Cheers,

Will

[1] https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/fixes