path: root/Makefile
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authorJason Baron <jbaron@redhat.com>2010-09-17 11:09:00 -0400
committerSteven Rostedt <rostedt@goodmis.org>2010-09-22 16:29:41 -0400
commitbf5438fca2950b03c21ad868090cc1a8fcd49536 (patch)
tree9fc5693763263704de8d8ba1c37a84172dbe5eb7 /Makefile
parentfa6f2cc77081792e4edca9168420a3422299ef15 (diff)
jump label: Base patch for jump label
base patch to implement 'jump labeling'. Based on a new 'asm goto' inline assembly gcc mechanism, we can now branch to labels from an 'asm goto' statment. This allows us to create a 'no-op' fastpath, which can subsequently be patched with a jump to the slowpath code. This is useful for code which might be rarely used, but which we'd like to be able to call, if needed. Tracepoints are the current usecase that these are being implemented for. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jason Baron <jbaron@redhat.com> LKML-Reference: <ee8b3595967989fdaf84e698dc7447d315ce972a.1284733808.git.jbaron@redhat.com> [ cleaned up some formating ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Makefile')
1 files changed, 5 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 92ab33f16cf..a906378d505 100644
--- a/Makefile
+++ b/Makefile
@@ -591,6 +591,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
+# check for 'asm goto'
+ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
# But warn user when we do so
warn-assign = \