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| author | James Hogan <james.hogan@imgtec.com> | 2017-06-29 10:12:34 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-27 15:06:07 -0700 |
| commit | 62d131ec60cdd8751e40e92b0fb78e30932e6c14 (patch) | |
| tree | 8b26daf53e68883edf133615a792800c943f8253 /arch/mips/kernel/proc.c | |
| parent | 4d9f109ff9ca5624e14bbdfbd60b63513123b060 (diff) | |
MIPS: Negate error syscall return in trace
commit 4f32a39d49b25eaa66d2420f1f03d371ea4cd906 upstream.
The sys_exit trace event takes a single return value for the system
call, which MIPS passes the value of the $v0 (result) register, however
MIPS returns positive error codes in $v0 with $a3 specifying that $v0
contains an error code. As a result erroring system calls are traced
returning positive error numbers that can't always be distinguished from
success.
Use regs_return_value() to negate the error code if $a3 is set.
Fixes: 1d7bf993e073 ("MIPS: ftrace: Add support for syscall tracepoints.")
Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16651/
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips/kernel/proc.c')
0 files changed, 0 insertions, 0 deletions