Re: [PATCH] perf: enum overflow in uapi/linux/perf_event.h

[Christophe Leroy]

On 09/07/2018 01:42 PM, Peter Zijlstra wrote:
> On Fri, Sep 07, 2018 at 01:27:19PM +0000, Christophe Leroy wrote:
> > On PPC32, enums are 32 bits, so __PERF_SAMPLE_CALLCHAIN_EARLY is
> > out of scope. The following sparse warning is encountered:
> >
> >    CHECK   arch/powerpc/kernel/process.c
> > ./include/uapi/linux/perf_event.h:147:56: warning: cast truncates bits from constant value (8000000000000000 becomes 0)
>
> Urgh... what compiler is that? I've not seen anything like that from the
> build bots.

[root@pc16082vm linux-powerpc]# sparse --version
0.5.2

[root@pc16082vm linux-powerpc]# ppc-linux-gcc --version
ppc-linux-gcc (GCC) 5.4.0