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From:   Florian Weimer <fweimer@redhat.com>
To:     Lukas Wunner <lukas@wunner.de>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Arnd Bergmann <arnd@kernel.org>,
        Russell King - ARM Linux admin <linux@armlinux.org.uk>,
        linux-toolchains@vger.kernel.org,
        Mark Rutland <mark.rutland@arm.com>,
        Theodore Ts'o <tytso@mit.edu>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andreas Dilger <adilger.kernel@dilger.ca>,
        Ext4 Developers List <linux-ext4@vger.kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak
 memory ordering issues
References: <20210106172033.GA2165@willie-the-truck>
        <20210106223223.GM1551@shell.armlinux.org.uk>
        <20210107111841.GN1551@shell.armlinux.org.uk>
        <20210107124506.GO1551@shell.armlinux.org.uk>
        <CAK8P3a2TXPfFpgy+XjpDzOqt1qpDxufwiD-BLNbn4W_jpGp98g@mail.gmail.com>
        <20210107133747.GP1551@shell.armlinux.org.uk>
        <CAK8P3a2J8fLjPhyV0XUeuRBdSo6rz1gU4wrQRyfzKQvwhf22ag@mail.gmail.com>
        <X/gkMmObbkI4+ip/@hirez.programming.kicks-ass.net>
        <20210108092655.GA4031@willie-the-truck>
        <CAHk-=whnKkj5CSbj-uG_MVVUsPZ6ppd_MFhZf_kpXDkh2MAVRA@mail.gmail.com>
        <20210112132049.GA26096@wunner.de>
Date:   Tue, 12 Jan 2021 14:31:45 +0100
In-Reply-To: <20210112132049.GA26096@wunner.de> (Lukas Wunner's message of
        "Tue, 12 Jan 2021 14:20:49 +0100")
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* Lukas Wunner:

> On Fri, Jan 08, 2021 at 12:02:53PM -0800, Linus Torvalds wrote:
>> I appreciate Arnd pointing out "--std=gnu11", though. What are the
>> actual relevant language improvements?
>> 
>> Variable declarations in for-loops is the only one I can think of. I
>> think that would clean up some code (and some macros), but might not
>> be compelling on its own.
>
> Anonymous structs/unions.  I used to have a use case for that in
> struct efi_dev_path in include/linux/efi.h, but Ard Biesheuvel
> refactored it in a gnu89-compatible way for v5.7 with db8952e7094f.

Aren't those a GNU extension supported since GCC 3.0?

Thanks,
Florian
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