tree b4e74b57c0cb652640fe394a11bd7368919471a7
parent 0d38200da5d9c26508fb5435e36ccd1345825ef3
author Andi Kleen <ak@linux.intel.com> 1511818453 -0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1614085233 +0100

trace: Use -mcount-record for dynamic ftrace

commit 96f60dfa5819a065bfdd2f2ba0df7d9cbce7f4dd upstream.

gcc 5 supports a new -mcount-record option to generate ftrace
tables directly. This avoids the need to run record_mcount
manually.

Use this option when available.

So far doesn't use -mcount-nop, which also exists now.

This is needed to make ftrace work with LTO because the
normal record-mcount script doesn't run over the link
time output.

It should also improve build times slightly in the general
case.
Link: http://lkml.kernel.org/r/20171127213423.27218-12-andi@firstfloor.org

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>