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

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Message-ID: <CAK8P3a0BUDCUE7qT=tAh4U2LNOqHUBDadRJXsbJMT3cX3hnVnQ@mail.gmail.com>
Date:   Wed, 1 Mar 2017 16:27:29 +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 3:40 PM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> On Wed, Mar 01, 2017 at 10:45:03AM +0100, Arnd Bergmann wrote:

>> Actually, something must have changed in gcc since last month, I also
>> just got a report in another file:
>>
>> drivers/i2c/busses/i2c-img-scb.o: warning: objtool: img_i2c_probe()
>> falls through to next function img_i2c_read_fifo()
>
> This one looks like it could be related to some recent objtool changes
> which affect how it interprets 'ud2'.  Which commit were you testing
> with?  Can you provide the .config file, and the object file if it's not
> too big?

This is with my randconfig test series on top of latest linux-next.
I see it with the latest gcc-7.0.1 snapshot as well as an earlier gcc-7.0.0
build (20161201), but not with gcc-6.3.1

     Arnd

Download attachment "i2c-img-scb.o" of type "application/x-object" (15088 bytes)

Download attachment "0xE4B9EB4B_defconfig.gz" of type "application/x-gzip" (23060 bytes)