linux-kernel - Re: [PATCH] [RFC] x86: avoid -mtune=atom for objtool warnings

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Message-ID: <CAK8P3a29bVFUqtZyvWBMgYvfGJFktUSL8_bY-oXM_po5pemHPw@mail.gmail.com>
Date:   Wed, 1 Mar 2017 23:42:54 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Denys Vlasenko <dvlasenk@...hat.com>
Subject: Re: [PATCH] [RFC] x86: avoid -mtune=atom for objtool warnings

On Wed, Mar 1, 2017 at 5:53 PM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> On Wed, Mar 01, 2017 at 04:27:29PM +0100, Arnd Bergmann wrote:

> I see no apparent reason for the ud2.

It's the possible division by zero. This change would avoid the ud2:

diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index db8e8b40569d..a2b09c518225 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -1196,6 +1196,8 @@ static int img_i2c_init(struct img_i2c *i2c)
        clk_khz /= prescale;

        /* Setup the clock increment value */
+       if (clk_khz < 1)
+               clk_khz = 1;
        inc = (256 * 16 * bitrate_khz) / clk_khz;

        /*


     Arnd