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| author | Hugh Dickins <hughd@google.com> | 2017-09-03 18:57:03 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-05 15:44:23 +0100 |
| commit | 003e476716906afa135faf605ae0a5c3598c0293 (patch) | |
| tree | 407dda926970073f3bebd47655a1fa151ce0174a /kernel/fork.c | |
| parent | edde73205b3fdde8c8a3adfce78cc6d0de72386b (diff) | |
| download | linux-rt-003e476716906afa135faf605ae0a5c3598c0293.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>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/fork.c')
| -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 3842ceddb7f9..ac00f14208b7 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -168,12 +168,9 @@ static struct thread_info *alloc_thread_info_node(struct task_struct *tsk, return page ? page_address(page) : NULL; } -extern void kaiser_remove_mapping(unsigned long start_addr, unsigned long size); static inline void free_thread_info(struct thread_info *ti) { -#ifdef CONFIG_KAISER - kaiser_remove_mapping((unsigned long)ti, THREAD_SIZE); -#endif + kaiser_unmap_thread_stack(ti); free_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER); } # else @@ -358,7 +355,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) tsk->stack = ti; - err= kaiser_add_mapping((unsigned long)tsk->stack, THREAD_SIZE, __PAGE_KERNEL); + err = kaiser_map_thread_stack(tsk->stack); if (err) goto free_ti; #ifdef CONFIG_SECCOMP |