linux-kernel - Re: [PATCH] perf: enum overflow in uapi/linux/perf

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Message-ID: <ae32181d-37b2-1a13-3c72-66775e05ff88@c-s.fr>
Date:   Fri, 7 Sep 2018 13:50:18 +0000
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] perf: enum overflow in uapi/linux/perf_event.h



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@...6082vm linux-powerpc]# sparse --version
0.5.2

[root@...6082vm linux-powerpc]# ppc-linux-gcc --version
ppc-linux-gcc (GCC) 5.4.0