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authorHugh Dickins <hughd@google.com>2017-09-03 18:57:03 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-01-05 15:46:32 +0100
commit0994a2cf8fe4e884bad4810681117a7d0096c8e7 (patch)
tree524d647d9dc1bde3133cd09aca758e76792aad53 /kernel/fork.c
parentac2f1018ac210cfedcfab82dbafbda4e2db7ed08 (diff)
downloadlinux-linaro-stable-0994a2cf8fe4e884bad4810681117a7d0096c8e7.tar.gz
kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE
Kaiser only needs to map one page of the stack; and kernel/fork.c did not build on powerpc (no __PAGE_KERNEL). It's all cleaner if linux/kaiser.h provides kaiser_map_thread_stack() and kaiser_unmap_thread_stack() wrappers around asm/kaiser.h's kaiser_add_mapping() and kaiser_remove_mapping(). And use linux/kaiser.h in init/main.c to avoid the #ifdefs there. Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 0b9688d91eaa..70e10cb49be0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -212,12 +212,9 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
#endif
}
-extern void kaiser_remove_mapping(unsigned long start_addr, unsigned long size);
static inline void free_thread_stack(struct task_struct *tsk)
{
-#ifdef CONFIG_KAISER
- kaiser_remove_mapping((unsigned long)tsk->stack, THREAD_SIZE);
-#endif
+ kaiser_unmap_thread_stack(tsk->stack);
#ifdef CONFIG_VMAP_STACK
if (task_stack_vm_area(tsk)) {
unsigned long flags;
@@ -501,7 +498,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
*/
tsk->stack = stack;
- err= kaiser_add_mapping((unsigned long)tsk->stack, THREAD_SIZE, __PAGE_KERNEL);
+ err= kaiser_map_thread_stack(tsk->stack);
if (err)
goto free_stack;
#ifdef CONFIG_VMAP_STACK