[PATCH 4.1 032/123] ARC: Override toplevel default -O2 with -O3

From: Greg Kroah-Hartman
Date: Sat Aug 08 2015 - 18:34:15 EST

4.1-stable review patch. If anyone has any objections, please let me know.


From: Vineet Gupta <vgupta@xxxxxxxxxxxx>

commit 97709069214eb75312c14946803b9da4d3814203 upstream.

ARC kernels have historically been built with -O3, despite top level
Makefile defaulting to -O2. This was facilitated by implicitly ordering
of arch makefile include AFTER top level assigned -O2.

An upstream fix to top level a1c48bb160f ("Makefile: Fix unrecognized
cross-compiler command line options") changed the ordering, making ARC
-O3 defunct.

Fix that by NOT relying on any ordering whatsoever and use the proper
arch override facility now present in kbuild (ARCH_*FLAGS)

Depends-on: ("kbuild: Allow arch Makefiles to override {cpp,ld,c}flags")
Suggested-by: Michal Marek <mmarek@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/arc/Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -43,7 +43,8 @@ endif

# Generic build system uses -O2, we want -O3
-cflags-y += -O3
+# Note: No need to add to cflags-y as that happens anyways

# small data is default for elf32 tool-chain. If not usable, disable it

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/