]> git.baikalelectronics.ru Git - kernel.git/commit
powerpc/64: Make sys_switch_endian() traceable
authorMichael Ellerman <mpe@ellerman.id.au>
Tue, 15 Jan 2019 06:37:36 +0000 (17:37 +1100)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 21 Feb 2019 13:10:15 +0000 (00:10 +1100)
commite4f2a3e0c9d74e44e54fc225d928d27668906ce1
treefdf3bb06f3b46c9d5350836a669881888bf8b05b
parentf60a6c97cdff21d2f10e112e01f739e506eae5e8
powerpc/64: Make sys_switch_endian() traceable

We weren't using SYSCALL_DEFINE for sys_switch_endian(), which means
it wasn't able to be traced by CONFIG_FTRACE_SYSCALLS.

By using the macro we create the right metadata and the syscall is
visible. eg:

  # cd /sys/kernel/debug/tracing
  # echo 1 | tee events/syscalls/sys_*_switch_endian/enable
  # ~/switch_endian_test
  # cat trace
  ...
  switch_endian_t-3604  [009] ....   315.175164: sys_switch_endian()
  switch_endian_t-3604  [009] ....   315.175167: sys_switch_endian -> 0x5555aaaa5555aaaa
  switch_endian_t-3604  [009] ....   315.175169: sys_switch_endian()
  switch_endian_t-3604  [009] ....   315.175169: sys_switch_endian -> 0x5555aaaa5555aaaa

Fixes: 00eaa395f246 ("powerpc: Add a proper syscall for switching endianness")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/kernel/syscalls.c