diff options
| author | Hugh Dickins <hughd@google.com> | 2017-09-03 18:57:03 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-05 15:46:32 +0100 |
| commit | 0994a2cf8fe4e884bad4810681117a7d0096c8e7 (patch) | |
| tree | 524d647d9dc1bde3133cd09aca758e76792aad53 /kernel | |
| parent | ac2f1018ac210cfedcfab82dbafbda4e2db7ed08 (diff) | |
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')
| -rw-r--r-- | kernel/fork.c | 7 |
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 |