linux-kernel - Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues

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Message-ID: <20210108103109.GA23265@duo.ucw.cz>
Date:   Fri, 8 Jan 2021 11:31:10 +0100
From:   Pavel Machek <pavel@....cz>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...nel.org>, Will Deacon <will@...nel.org>,
        linux-toolchains@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory
 ordering issues

Hi!

> > > The gcc bugzilla mentions backports into gcc-linaro, but I do not see
> > > them in my git history.
> > 
> > So, do we raise the minimum gcc version for the kernel as a whole to 5.1
> > or just for aarch64?
> 
> Russell, Arnd, thanks so much for tracking down the root cause of the
> bug!
> 
> I will note that RHEL 7 uses gcc 4.8.  I personally don't have an
> objections to requiring developers using RHEL 7 to have to install a
> more modern gcc (since I use Debian Testing and gcc 10.2.1, myself,
> and gcc 5.1 is so five years ago :-), but I could imagine that being
> considered inconvenient for some.

I'm on gcc 4.9.2 on a machine that is hard to upgrade :-(.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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