commit 548f0a4e02f6fa33278e77a2a6477cdeb512317f
author Richard Weinberger <richard@nod.at> Mon Jul 25 17:12:53 2011 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Mon Jul 25 20:57:13 2011 -0700
tree c1e3830dd6ad0561745452134ec64fd1fa7656a2
parent b743ac54e54ca18fb7164a97cc77cf1ccee0b0f7

um: Set __HAVE_ARCH_GATE_AREA for i386

When UML is unable to reuse the host's vDSO FIXADDR_USER_START is zero.
To handle this special case correclty we have to implement custom gate
area helper methods.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/sys-i386/asm/elf.h

diff --git a/arch/um/sys-i386/asm/elf.h b/arch/um/sys-i386/asm/elf.h
index d964a41..4230555 100644
--- a/arch/um/sys-i386/asm/elf.h
+++ b/arch/um/sys-i386/asm/elf.h
@@ -105,6 +105,8 @@
 #define FIXADDR_USER_START      VSYSCALL_BASE
 #define FIXADDR_USER_END        VSYSCALL_END
 
+#define __HAVE_ARCH_GATE_AREA 1
+
 /*
  * Architecture-neutral AT_ values in 0-17, leave some room
  * for more of them, start the x86-specific ones at 32.