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.
We have been using long long cast to print timespec64 tv_sec.
I'm not sure what format specifier we would use if we cast to s64. printk-formats suggests %lld or %llx. Meaning a cast to long long.
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.
dma_addr_t can be u64 or u32 based on architecture be it 32 bit or 64 bit. But, timespec64 tv_sec is always s64. This is the opposite problem from dma_addr_t that it is 64 bits regardless of architecture. So, wouldn't it be easier to use long long cast for tv_sec and then print tv_nsec as long?
-Deepa