ftrace/x86: Have save_mcount_regs store RIP in %rdi for first parameter
authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>
Mon, 24 Nov 2014 18:21:09 +0000 (13:21 -0500)
committerSteven Rostedt <rostedt@goodmis.org>
Mon, 1 Dec 2014 19:07:39 +0000 (14:07 -0500)
commit094dfc545139510f251b9595850aa63fe2a8c131
tree1d92fc26e6a38cbd3938e1ab1fe2fbf5584bfb7a
parent05df710ec343cf351475e86bfaf89938e5114d69
ftrace/x86: Have save_mcount_regs store RIP in %rdi for first parameter

Instead of having save_mcount_regs store the RIP in %rdx as a temp register
to place it in the proper location of the pt_regs on the stack. Use the
%rdi register as the temp register. This lets us remove the extra store
in the ftrace_caller_setup macro.

Link: http://lkml.kernel.org/r/CA+55aFwF+qCGSKdGaEgW4p6N65GZ5_XTV=1NbtWDvxnd5yYLiw@mail.gmail.com
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1411262304010.3961@nanos
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
arch/x86/kernel/mcount_64.S