stackprotector: update make rules

Impact: no default -fno-stack-protector if stackp is enabled, cleanup

Stackprotector make rules had the following problems.

* cc support test and warning are scattered across makefile and
  kernel/panic.c.

* -fno-stack-protector was always added regardless of configuration.

Update such that cc support test and warning are contained in makefile
and -fno-stack-protector is added iff stackp is turned off.  While at
it, prepare for 32bit support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 4 deletions

diff --git a/kernel/panic.c b/kernel/panic.c
index 33cab3de1763..32fe4eff1b89 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -359,10 +359,6 @@ EXPORT_SYMBOL(warn_slowpath);
 
 #ifdef CONFIG_CC_STACKPROTECTOR
 
-#ifndef GCC_HAS_SP
-#warning You have selected the CONFIG_CC_STACKPROTECTOR option, but the gcc used does not support this.
-#endif
-
 /*
  * Called when gcc's -fstack-protector feature is used, and
  * gcc detects corruption of the on-stack canary value