Messages in this thread | | | From | Arnd Bergmann <> | Date | Mon, 27 Mar 2017 11:55:52 +0200 | Subject | Re: [PATCH] trace: Make trace_hwlat timestamp y2038 safe |
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On Mon, Mar 27, 2017 at 11:25 AM, kbuild test robot <lkp@intel.com> wrote: > Hi Deepa, > > [auto build test WARNING on tip/perf/core] > [also build test WARNING on v4.11-rc4 next-20170327] > [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] > > url: https://github.com/0day-ci/linux/commits/Deepa-Dinamani/trace-Make-trace_hwlat-timestamp-y2038-safe/20170327-150010 > config: x86_64-randconfig-n0-03271517 (attached as .config) > compiler: gcc-4.8 (Debian 4.8.4-1) 4.8.4 > reproduce: > # save the attached .config to linux build tree > make ARCH=x86_64 > > All warnings (new ones prefixed by >>): > > kernel/trace/trace_output.c: In function 'trace_hwlat_print': >>> kernel/trace/trace_output.c:1168:5: warning: format '%lld' expects argument of type 'long long int', but argument 6 has type '__kernel_time_t' [-Wformat=] > field->timestamp.tv_nsec);
This happens on 64-bit architectures because 'struct timespec64' is defined to be equal to 'struct timespec', which has a 'long' tv_sec rather than 'long long'.
A cast to 's64' is probably the best workaround.
> kernel/trace/trace_output.c: In function 'trace_hwlat_raw': > kernel/trace/trace_output.c:1202:5: warning: format '%lld' expects argument of type 'long long int', but argument 5 has type '__kernel_time_t' [-Wformat=] > field->seqnum);
Same here.
Arnd
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