tree f657ece9cd7b0e8f6a0151dc8c4eee1266f2a109
parent 197e2eabc90c203d1086916b7f66694ba5fbb937
author Steven Rostedt <srostedt@redhat.com> 1252617764 -0400
committer Steven Rostedt <rostedt@goodmis.org> 1252617764 -0400

x86/tracing: comment need for atomic nop

The dynamic function tracer relys on the macro P6_NOP5 always being
an atomic NOP. If for some reason it is changed to be two operations
(like a nop2 nop3) it can faults within the kernel when the function
tracer modifies the code.

This patch adds a comment to note that the P6_NOPs are expected to
be atomic. This will hopefully prevent anyone from changing that.

Reported-by: Mathieu Desnoyer <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>