linux-kernel - Re: [PATCH 08/24] init: pass root_device

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Date:   Mon, 26 Jun 2023 09:53:25 +0200
From:   Christoph Hellwig <hch@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Mike Snitzer <snitzer@...nel.org>,
        Joern Engel <joern@...ybastard.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Pavel Machek <pavel@....cz>,
        Loic Poulain <loic.poulain@...aro.org>, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH 08/24] init: pass root_device_name explicitly

On Fri, Jun 23, 2023 at 05:08:59PM -0700, Guenter Roeck wrote:
> Hi,
> 
> On Wed, May 31, 2023 at 02:55:19PM +0200, Christoph Hellwig wrote:
> > Instead of declaring root_device_name as a global variable pass it as an
> > argument to the functions using it.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> 
> This patch results in the following build error when trying to build
> xtensa:tinyconfig.
> 
> WARNING: modpost: vmlinux: section mismatch in reference: strcpy.isra.0+0x14 (section: .text.unlikely) -> initcall_level_names (section: .init.data)
> ERROR: modpost: Section mismatches detected.

I can reproduce these with gcc 13.1 on xtensa, but the report makes
no sense to me.  If I disable CONFIG_CC_OPTIMIZE_FOR_SIZE it now reports
a similar warning for put_page intead of strcpy which seems just as
arcance.