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Date:   Tue, 12 Jan 2021 14:20:49 +0100
From:   Lukas Wunner <>
To:     Linus Torvalds <>
Cc:     Will Deacon <>,
        Peter Zijlstra <>,
        Arnd Bergmann <>,
        Russell King - ARM Linux admin <>,,
        Mark Rutland <>,
        Theodore Ts'o <>,
        "" <>,
        Andreas Dilger <>,
        Ext4 Developers List <>,
        Linux ARM <>
Subject: Re: Aarch64 EXT4FS inode checksum failures - seems to be weak memory
 ordering issues

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.

[The above was copy-pasted from last time this discussion came up
in July 2020.  Back then, Kirill Shutemov likewise mentioned the
local variables in loops feature:



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