linux-kernel - Re: + ipc-sem-use-flexible-array-in-struct-sem_undo.patch added to mm-nonmm-unstable branch

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Message-ID: <42ccb0ff-f6ab-5fb1-09a6-e212f9b15582@colorfullife.com>
Date:   Wed, 19 Jul 2023 19:17:58 +0200
From:   Manfred Spraul <manfred@...orfullife.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, jannh@...gle.com,
        dave@...olabs.net, christophe.jaillet@...adoo.fr
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: + ipc-sem-use-flexible-array-in-struct-sem_undo.patch added to
 mm-nonmm-unstable branch

Hi Christophe,

On 7/10/23 22:35, Andrew Morton wrote:
> The patch titled
>       Subject: ipc/sem: use flexible array in 'struct sem_undo'
> has been added to the -mm mm-nonmm-unstable branch.  Its filename is
>       ipc-sem-use-flexible-array-in-struct-sem_undo.patch
>
> This patch will shortly appear at
>       https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ipc-sem-use-flexible-array-in-struct-sem_undo.patch
>
> This patch will later appear in the mm-nonmm-unstable branch at
>      git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
>
> Before you just go and hit "reply", please:
>     a) Consider who else should be cc'ed
>     b) Prefer to cc a suitable mailing list as well
>     c) Ideally: find the original patch on the mailing list and do a
>        reply-to-all to that, adding suitable additional cc's
>
> *** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
>
> The -mm tree is included into linux-next via the mm-everything
> branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> and is updated there every 2-3 working days
>
> ------------------------------------------------------
> From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Subject: ipc/sem: use flexible array in 'struct sem_undo'
> Date: Sun, 9 Jul 2023 18:12:55 +0200
>
> Turn 'semadj' in 'struct sem_undo' into a flexible array.
>
> The advantages are:
>     - save the size of a pointer when the new undo structure is allocated
>     - avoid some always ugly pointer arithmetic to get the address of semadj
>     - avoid an indirection when the array is accessed
>
> While at it, use struct_size() to compute the size of the new undo
> structure.
>
> Link: https://lkml.kernel.org/r/1ba993d443ad7e16ac2b1902adab1f05ebdfa454.1688918791.git.christophe.jaillet@wanadoo.fr
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Cc: Jann Horn <jannh@...gle.com>
> Cc: Manfred Spraul <manfred@...orfullife.com>
> Cc: Davidlohr Bueso <dave@...olabs.net>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>

Reviewed-by: Manfred Spraul <manfred@...orfullife.com>


--

     Manfred