linux-kernel - Re: [PATCH 11/15] selftests/seccomp: Remove SYSCALL_NUM_RET_SHARE_REG in favor of SYSCALL_RET

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Message-ID: <20200915161124.oqgoiegni3jqwtno@wittgenstein>
Date:   Tue, 15 Sep 2020 18:11:24 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christian Brauner <christian@...uner.io>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>,
        linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org,
        linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH 11/15] selftests/seccomp: Remove
 SYSCALL_NUM_RET_SHARE_REG in favor of SYSCALL_RET_SET

On Sat, Sep 12, 2020 at 04:08:16AM -0700, Kees Cook wrote:
> Instead of special-casing the specific case of shared registers, create
> a default SYSCALL_RET_SET() macro (mirroring SYSCALL_NUM_SET()), that
> writes to the SYSCALL_RET register. For architectures that can't set the
> return value (for whatever reason), they can define SYSCALL_RET_SET()
> without an associated SYSCALL_RET() macro. This also paves the way for
> architectures that need to do special things to set the return value
> (e.g. powerpc).
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---

Looks good!
Acked-by: Christian Brauner <christian.brauner@...ntu.com>