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SubjectRe: [GIT PULL] io_uring updates for 5.10-rc1
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On 10/13/20 1:46 PM, Linus Torvalds wrote:
> On Mon, Oct 12, 2020 at 6:46 AM Jens Axboe <axboe@kernel.dk> wrote:
>>
>> Here are the io_uring updates for 5.10.
>
> Very strange. My clang build gives a warning I've never seen before:
>
> /tmp/io_uring-dd40c4.s:26476: Warning: ignoring changed section
> attributes for .data..read_mostly
>
> and looking at what clang generates for the *.s file, it seems to be
> the "section" line in:
>
> .type io_op_defs,@object # @io_op_defs
> .section .data..read_mostly,"a",@progbits
> .p2align 4
>
> I think it's the combination of "const" and "__read_mostly".
>
> I think the warning is sensible: how can a piece of data be both
> "const" and "__read_mostly"? If it's "const", then it's not "mostly"
> read - it had better be _always_ read.
>
> I'm letting it go, and I've pulled this (gcc doesn't complain), but
> please have a look.

Huh weird, I'll take a look. FWIW, the construct isn't unique across
the kernel.

What clang are you using?

--
Jens Axboe

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