linux-kernel - Re: [PATCH v1 1/2] tools/nolibc/stdlib: Support overflow checking for older compiler versions

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Message-ID: <CAOG64qO3B_FmaLS9=C+EuWcJhsw2Tr1Cci0BL1=eAkLWG=NDnQ@mail.gmail.com>
Date:   Fri, 20 May 2022 18:29:56 +0700
From:   Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
To:     Ammar Faizi <ammarfaizi2@...weeb.org>
Cc:     "Paul E. McKenney" <paulmck@...nel.org>, Willy Tarreau <w@....eu>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "GNU/Weeb Mailing List" <gwml@...r.gnuweeb.org>,
        Facebook Kernel Team <kernel-team@...com>
Subject: Re: [PATCH v1 1/2] tools/nolibc/stdlib: Support overflow checking for
 older compiler versions

On Fri, May 20, 2022 at 12:21 AM Ammar Faizi <ammarfaizi2@...weeb.org> wrote:
> Previously, we used __builtin_mul_overflow() to check for overflow in
> the multiplication operation in the calloc() function. However, older
> compiler versions don't support this built-in. This patch changes the
> overflow checking mechanism to make it work on any compiler version
> by using a division method to check for overflow. No functional change
> intended. While in there, remove the unused variable `void *orig`.
>
> Link: https://lore.kernel.org/lkml/20220330024114.GA18892@1wt.eu
> Suggested-by: Willy Tarreau <w@....eu>
> Cc: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>
> Signed-off-by: Ammar Faizi <ammarfaizi2@...weeb.org>

Reviewed-by: Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>

tq

-- Viro