Use of void pointer arithmetic?

Johannes Berg johannes at
Thu Feb 24 02:31:12 PST 2022

On Thu, 2022-02-24 at 11:59 +0200, Kalle Valo wrote:
> A good question. I have always just thought we should avoid void pointer
> arithmetic due to the C standard, but now that you mention it void
> pointers can indeed simplify the code. So I'm not so sure anymore.
> Any opinions? Is there a kernel wide recommendation for this?

The kernel only enables it with W=3, which I guess nobody uses anyway
... Originally it came from commit 4a5838ad9d2d ("kbuild: Add extra gcc
checks") with a pointer to

(which is offline right now due to an expired certificate ...)

but setting back my clock it seems to point to

but the thread kind of revolves around -Wconversion.

FreeBSD does enable -Wpointer-arith which is why we've been trying to
keep iwlwifi clean as a courtesy to them, but for really Linux-only code
I dunno if there's much point. Although of course that applies also to
FreeBSD ...


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