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linux-stable/arch/powerpc/kernel/trace
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Naveen N. Rao ea678ac627 powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths 
We have some C code that we call into from real mode where we cannot
take any exceptions. Though the C functions themselves are mostly safe,
if these functions are traced, there is a possibility that we may take
an exception. For instance, in certain conditions, the ftrace code uses
WARN(), which uses a 'trap' to do its job.

For such scenarios, introduce a new field in paca 'ftrace_enabled',
which is checked on ftrace entry before continuing. This field can then
be set to zero to disable/pause ftrace, and set to a non-zero value to
resume ftrace.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-05-03 22:32:25 +10:00
..
ftrace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace_32.S
ftrace_64.S
ftrace_64_mprofile.S powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths 2018-05-03 22:32:25 +10:00
ftrace_64_pg.S powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code paths 2018-05-03 22:32:25 +10:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace_clock.c