On Fri, May 31, 2019 at 11:03:19PM +0200, Arnd Bergmann wrote:

On Fri, May 31, 2019 at 10:06 PM 'Nick Desaulniers' via Clang Built
Linux [off-list ref] wrote:

quoted

On Fri, May 31, 2019 at 12:21 PM Arnd Bergmann [off-list ref] wrote:

quoted

clang, I would suggest dropping your patch then, and instead adding

I disagree.  The minimum version of gcc required to build the kernel
is 4.6, so the comment about older versions of gcc is irrelevant and
should be removed.

Sure, that's ok. It just feels wrong to remove a warning that points
to a real problem that still exists and can be detected at the moment.

If we think that clang-9 is going to be fixed before its release,
the warning could be changed to test for that version as a minimum,
and point to the bugzilla entry for more details.

      Arnd

I just tested the arm64 implementation and it shows the same warnings
about cost as arm.

However, I see a warning as something that can be resolved by the user.
The GCC warning's solution is to just use a newer version of GCC
(something fairly easily attainable). This new warning currently has no
solution other than don't use clang.

It is up to you and Nick but I would say unless we are going to
prioritize fixing this, we shouldn't add a warning for it. I'd say it is
more appropriate to fix it then add a warning saying upgrade to this
version to fix it, like the GCC one (though I don't necessarily hate
adding the warning assuming that clang 9 will have it fixed).

Cheers,
Nathan

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