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    SubjectRe: Aarch64 EXT4FS inode checksum failures - seems to be weak memory ordering issues
    On Fri, Jan 8, 2021 at 9:02 PM Linus Torvalds
    <torvalds@linux-foundation.org> wrote:
    > On Fri, Jan 8, 2021 at 1:27 AM Will Deacon <will@kernel.org> wrote:
    > >
    > > On Fri, Jan 08, 2021 at 10:21:54AM +0100, Peter Zijlstra wrote:
    > > > On Thu, Jan 07, 2021 at 10:20:38PM +0100, Arnd Bergmann wrote:
    > > > > On Thu, Jan 7, 2021 at 2:37 PM Russell King - ARM Linux admin
    >
    > 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.

    I think that was the main one, as most of --std=c11 is already part
    of --std=gnu89 as a gnu extension. There were a few things that
    came up with clang porting, as clang is somewhat closer to gnu11
    than to gnu89, but I don't remember exactly what that was.

    I would still like to improve READ_ONCE()/get_user()/cmpxchg()
    further using __auto_type and _Generic where possible, but I think
    that was already supported in gcc-4.9, and does not require gcc-5.

    Arnd

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