ftrace/x86: Use breakpoints for converting function graph caller

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When the conversion was made to remove stop machine and use the breakpoint
logic instead, the modification of the function graph caller is still
done directly as though it was being done under stop machine.

As it is not converted via stop machine anymore, there is a possibility
that the code could be layed across cache lines and if another CPU is
accessing that function graph call when it is being updated, it could
cause a General Protection Fault.

Convert the update of the function graph caller to use the breakpoint
method as well.

Cc: H. Peter Anvin <hpa@zytor.com>
Cc: stable@vger.kernel.org # 3.5+
Fixes: 08d636b6d4 "ftrace/x86: Have arch x86_64 use breakpoints instead of stop machine"
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt (Red Hat) 2014-02-11 20:19:44 -05:00 • committed by Steven Rostedt

parent d651aa1d68

commit 87fbb2ac60

1 changed files with 47 additions and 36 deletions

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arch/x86/kernel/ftrace.c

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