Messages in this thread Patch in this message | | | From | Jungseok Lee <> | Subject | [RFC PATCH 1/2] kernel/fork.c: add a function to calculate page address from thread_info | Date | Mon, 25 May 2015 01:01:32 +0900 |
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A current implementation assumes thread_info address is always correctly calculated via virt_to_page. It restricts a different approach, such as thread_info allocation from vmalloc space.
This patch, thus, introduces an independent function to calculate page address from thread_info one.
Suggested-by: Sungjinn Chung <barami97@gmail.com> Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: linux-arm-kernel@lists.infradead.org --- kernel/fork.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/kernel/fork.c b/kernel/fork.c index 03c1eaa..6300bbd 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -212,9 +212,14 @@ struct kmem_cache *vm_area_cachep; /* SLAB cache for mm_struct structures (tsk->mm) */ static struct kmem_cache *mm_cachep; +struct page * __weak arch_thread_info_to_page(struct thread_info *ti) +{ + return virt_to_page(ti); +} + static void account_kernel_stack(struct thread_info *ti, int account) { - struct zone *zone = page_zone(virt_to_page(ti)); + struct zone *zone = page_zone(arch_thread_info_to_page(ti)); mod_zone_page_state(zone, NR_KERNEL_STACK, account); } -- 1.9.1
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