uml: stop specially protecting kernel stacks

Map all of physical memory as executable to avoid having to change stack
protections during fork and exit.

unprotect_stack is now called only from MODE_TT code, so it is marked as such.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index bfa52f206bb6..f083787410af 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -82,9 +82,9 @@ unsigned long alloc_stack(int order, int atomic)
         if (atomic)
                 flags = GFP_ATOMIC;
         page = __get_free_pages(flags, order);
-        if(page == 0)
+        if (page == 0)
                 return 0;
-        stack_protections(page);
+
         return page;
 }
 
@@ -141,7 +141,6 @@ void release_thread(struct task_struct *task)
 
 void exit_thread(void)
 {
-        unprotect_stack((unsigned long) current_thread);
 }
 
 void *get_current(void)