On Tue, Mar 16, 2021 at 09:32:32AM +0100, Christophe Leroy wrote:
> +segher
I cannot see through the wood of #defines here, sorry.
> Still a problem.
>
> I don't understand, gcc bug ?
Rule #1: If you do not understand what is happening, it is not a
compiler bug. I'm not saying that it isn't, just that it is much more
likely something else.
> The offending argument is 'const ptrdiff_t object_index'
>
> We have:
>
> arch/powerpc/include/uapi/asm/posix_types.h:typedef long
> __kernel_ptrdiff_t;
So this is a 64-bit build.
> include/linux/types.h:typedef __kernel_ptrdiff_t ptrdiff_t;
>
> And get:
>
> CC mm/kfence/report.o
> In file included from ./include/linux/printk.h:7,
> from ./include/linux/kernel.h:16,
> from mm/kfence/report.c:10:
> mm/kfence/report.c: In function 'kfence_report_error':
> ./include/linux/kern_levels.h:5:18: warning: format '%td' expects argument
> of type 'ptrdiff_t', but argument 6 has type 'long int' [-Wformat=]
This is declared as
const ptrdiff_t object_index = meta ? meta - kfence_metadata : -1;
so maybe something with that goes wrong? What happens if you delete the
(useless) "const" here?
Segher
