tracing, slab: Fix no callsite ifndef CONFIG_KMEMTRACE
tracing, slab: Fix no callsite ifndef CONFIG_KMEMTRACE

For slab, if CONFIG_KMEMTRACE and CONFIG_DEBUG_SLAB are not set,
__do_kmalloc() will not track callers:

 # ./perf record -f -a -R -e kmem:kmalloc
 ^C
 # ./perf trace
 ...
          perf-2204  [000]   147.376774: kmalloc: call_site=c0529d2d ...
          perf-2204  [000]   147.400997: kmalloc: call_site=c0529d2d ...
          Xorg-1461  [001]   147.405413: kmalloc: call_site=0 ...
          Xorg-1461  [001]   147.405609: kmalloc: call_site=0 ...
       konsole-1776  [001]   147.405786: kmalloc: call_site=0 ...

Signed-off-by: Li Zefan <5dc16b054e85ffba6c8d314d8e55ae95dcab12a5@cn.fujitsu.com>
Reviewed-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@cs.helsinki.fi>
Cc: Christoph Lameter <ef3ecccf258fa062c5c6521a4887d40541963af7@linux-foundation.org>
Cc: Steven Rostedt <43232e92d70cc7aa53504ad0397085ee47bad87f@goodmis.org>
Cc: Frederic Weisbecker <e8a1bf9163cb25e93cfd6540f223b3872ea7ee55@gmail.com>
Cc: eb778157e2286fdb10f8995701208f41dd1c36dc@kvack.org <eb778157e2286fdb10f8995701208f41dd1c36dc@kvack.org>
Cc: Eduard - Gabriel Munteanu <9ef905a2d38b38aa7dfda4d9b84ab0b6430a67f0@linux360.ro>
LKML-Reference: <8811438b1ee5bbdbc8bb55dfdc35d7e0756ffde7@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@elte.hu>

KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas