linux-ext4 - Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues

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Message-ID: <877doii8n2.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 12 Jan 2021 14:31:45 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Russell King - ARM Linux admin <linux@...linux.org.uk>,
        linux-toolchains@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Theodore Ts'o <tytso@....edu>,
        "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

* 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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