On Mon, Mar 27, 2017 at 4:28 PM, Steven Rostedt rostedt@goodmis.org wrote:
On Mon, 27 Mar 2017 11:55:52 +0200 Arnd Bergmann arnd@arndb.de wrote:
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_hwl... 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.
Actually, I believe that "%zd" will work. It's made to work with size_t which is long long on 32 and long on 64.
size_t is always 'long', not 'long long'. We have %pad for dma_addr_t which may be 'long' or 'long long', but it is configuration dependent which one it is on 32-bit.
We could probably introduce a %pts format string for timespec64 and have that pretty-printed.
Arnd