arch: personality independent stack top

New arch macro STACK_TOP_MAX it gives the larges valid stack address for the
architecture in question.

It differs from STACK_TOP in that it will not distinguish between
personalities but will always return the largest possible address.

This is used to create the initial stack on execve, which we will move down to
the proper location once the binfmt code has figured out where that is.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ollie Wild <aaw@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/asm-sparc/a.out.h b/include/asm-sparc/a.out.h
index 9090060a23e6..917e04250696 100644
--- a/include/asm-sparc/a.out.h
+++ b/include/asm-sparc/a.out.h
@@ -92,6 +92,7 @@ struct relocation_info /* used when header.a_machtype == M_SPARC */
 #include <asm/page.h>
 
 #define STACK_TOP       (PAGE_OFFSET - PAGE_SIZE)
+#define STACK_TOP_MAX   STACK_TOP
 
 #endif /* __KERNEL__ */