asmlinkage Make __stack_chk_failed and memcmp visible

In LTO symbols implicitely referenced by the compiler need
to be visible. Earlier these symbols were visible implicitely
from being exported, but we disabled implicit visibility fo
 EXPORTs when modules are disabled to improve code size. So
now these symbols have to be marked visible explicitely.

Do this for __stack_chk_fail (with stack protector)
and memcmp.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1391845930-28580-10-git-send-email-ak@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/kernel/panic.c b/kernel/panic.c
index 6d6300375090e7b2345353174d85ed09f6f35ce4..3eb0ffb2596019077c7a46484e97f034e01d9cac 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -459,7 +459,7 @@ EXPORT_SYMBOL(warn_slowpath_null);
  * Called when gcc's -fstack-protector feature is used, and
  * gcc detects corruption of the on-stack canary value
  */
-void __stack_chk_fail(void)
+__visible void __stack_chk_fail(void)
 {
        panic("stack-protector: Kernel stack is corrupted in: %p\n",
                __builtin_return_address(0));

diff --git a/lib/string.c b/lib/string.c
index e5878de4f1013ddbdd3db07d1fca2bcc3a692a7c..9b1f9062a202fc243bef05853e5b965e91f96182 100644 (file)
--- a/lib/string.c
+++ b/lib/string.c
@@ -648,7 +648,7 @@ EXPORT_SYMBOL(memmove);
  * @count: The size of the area.
  */
 #undef memcmp
-int memcmp(const void *cs, const void *ct, size_t count)
+__visible int memcmp(const void *cs, const void *ct, size_t count)
 {
        const unsigned char *su1, *su2;
        int res = 0;