[PATCH 2/5 v16] ARM: Replace string mem* functions for KASan

[Ard Biesheuvel]

On Fri, 6 Nov 2020 at 09:26, Linus Walleij <linus.walleij at linaro.org> wrote:
>
> On Fri, Nov 6, 2020 at 8:49 AM Naresh Kamboju <naresh.kamboju at linaro.org> wrote:
>
> > arm KASAN build failure noticed on linux next 20201106 tag.
> > gcc: 9.x
> >
> > Build error:
> > ---------------
> > arch/arm/boot/compressed/string.c:24:1: error: attribute 'alias'
> > argument not a string
> >    24 | void *__memcpy(void *__dest, __const void *__src, size_t __n)
> > __alias(memcpy);
> >       | ^~~~
> > arch/arm/boot/compressed/string.c:25:1: error: attribute 'alias'
> > argument not a string
> >    25 | void *__memmove(void *__dest, __const void *__src, size_t
> > count) __alias(memmove);
> >       | ^~~~
> > arch/arm/boot/compressed/string.c:26:1: error: attribute 'alias'
> > argument not a string
> >    26 | void *__memset(void *s, int c, size_t count) __alias(memset);
> >       | ^~~~
> >
> > Reported-by: Naresh Kamboju <naresh.kamboju at linaro.org>
> >
> > Build details link,
> > https://builds.tuxbuild.com/1juBs4tXRA6Cwhd1Qnhh4vzCtDx/
>
> This looks like a randconfig build.
>
> Please drill down and try to report which combination of config
> options that give rise to this problem so we have a chance of
> amending it.
>

AFAIK there is an incompatible change in -next to change the
definition of the __alias() macro