From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Sat, 3 Sep 2005 22:54:46 +0000 (-0700)
Subject: [PATCH] mm: comment rmap
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c3dce2d89c269d5373a120d4a22fc2426ec992b0;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

[PATCH] mm: comment rmap

Just be clear that VM_RESERVED pages here are a bug, and the test is not there
because they are expected.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/mm/rmap.c b/mm/rmap.c
index 28c6cf96d3c4..f5a6966b7eb0 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -527,6 +527,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma)
 	 * If the page is mlock()d, we cannot swap it out.
 	 * If it's recently referenced (perhaps page_referenced
 	 * skipped over this mm) then we should reactivate it.
+	 *
+	 * Pages belonging to VM_RESERVED regions should not happen here.
 	 */
 	if ((vma->vm_flags & (VM_LOCKED|VM_RESERVED)) ||
 			ptep_clear_flush_young(vma, address, pte)) {