[PATCH] uml: fix static binary segfault

When UML is built as a static binary, it segfaults when run.  The reason is
that a memory hole that is present in dynamic binaries isn't there in static
binaries, and it contains essential stuff.

This fix removes the code which maps some anonymous memory into that hole and
cleans up some related code.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 11 deletions

diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c
index 44e41a35f000..61280167c560 100644
--- a/arch/um/kernel/mem.c
+++ b/arch/um/kernel/mem.c
@@ -24,8 +24,6 @@
 #include "init.h"
 #include "kern_constants.h"
 
-extern char __binary_start;
-
 /* Changed during early boot */
 unsigned long *empty_zero_page = NULL;
 unsigned long *empty_bad_page = NULL;
@@ -65,8 +63,6 @@ static void setup_highmem(unsigned long highmem_start,
 
 void mem_init(void)
 {
-        unsigned long start;
-
         max_low_pfn = (high_physmem - uml_physmem) >> PAGE_SHIFT;
 
         /* clear the zero-page */
@@ -81,13 +77,6 @@ void mem_init(void)
         free_bootmem(__pa(brk_end), uml_reserved - brk_end);
         uml_reserved = brk_end;
 
-        /* Fill in any hole at the start of the binary */
-        start = (unsigned long) &__binary_start & PAGE_MASK;
-        if(uml_physmem != start){
-                map_memory(uml_physmem, __pa(uml_physmem), start - uml_physmem,
-                           1, 1, 0);
-        }
-
         /* this will put all low memory onto the freelists */
         totalram_pages = free_all_bootmem();
         totalhigh_pages = highmem >> PAGE_SHIFT;