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@xxxxxxxxx>
Signed-off-by: Jungseok Lee <jungseoklee85@xxxxxxxxx>
Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
---
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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