linux-kernel - [PATCH RFP-V4 02/13] Fix comment about remap_file

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Message-Id: <20060826174213.14790.50608.stgit@memento.home.lan>
Date:	Sat, 26 Aug 2006 19:42:13 +0200
From:	Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
To:	Andrew Morton <akpm@...l.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH RFP-V4 02/13] Fix comment about remap_file_pages

From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>

This comment is a bit unclear and also stale. So fix it. Thanks to Hugh Dickins
for explaining me what it really referred to, and correcting my first fix.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@...oo.it>
---

 mm/fremap.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/mm/fremap.c b/mm/fremap.c
index 21b7d0c..cdeabad 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -215,9 +215,10 @@ #endif
 					    pgoff, flags & MAP_NONBLOCK);
 
 		/*
-		 * We can't clear VM_NONLINEAR because we'd have to do
-		 * it after ->populate completes, and that would prevent
-		 * downgrading the lock.  (Locks can't be upgraded).
+		 * We would like to clear VM_NONLINEAR, in the case when
+		 * sys_remap_file_pages covers the whole vma, so making
+		 * it linear again.  But cannot do so until after a
+		 * successful populate, and have no way to upgrade sem.
 		 */
 	}
 	if (likely(!has_write_lock))
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