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:

quoted

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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From: Florian Weimer

Sent: 12 January 2021 13:32

* Lukas Wunner:

quoted

On Fri, Jan 08, 2021 at 12:02:53PM -0800, Linus Torvalds wrote:

quoted

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?

They are certainly pretty old.
The 15 year old gcc we use for release builds (so binaries work
on old distributions) supports them.

	David

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