linux-kernel - [PATCH] NOMMU: use copy_*_user_page() in access_process

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Date:	Wed, 25 Nov 2009 00:55:03 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	uclinux-dev@...inux.org, David Howells <dhowells@...hat.com>,
	David McCullough <davidm@...pgear.com>,
	Greg Ungerer <gerg@...inux.org>,
	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Jie Zhang <jie.zhang@...log.com>
Subject: [PATCH] NOMMU: use copy_*_user_page() in access_process_vm()

From: Jie Zhang <jie.zhang@...log.com>

The mmu code uses the copy_*_user_page() variants in access_process_vm()
rather than copy_*_user() as the former includes an icache flush.  This is
important when doing things like setting software breakpoints with gdb.
So switch the nommu code over to do the same.

Signed-off-by: Jie Zhang <jie.zhang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 mm/nommu.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 9876fa0..51ae9be 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1889,9 +1889,11 @@ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, in
 
 		/* only read or write mappings where it is permitted */
 		if (write && vma->vm_flags & VM_MAYWRITE)
-			len -= copy_to_user((void *) addr, buf, len);
+			copy_to_user_page(vma, NULL, NULL,
+					  (void *) addr, buf, len);
 		else if (!write && vma->vm_flags & VM_MAYREAD)
-			len -= copy_from_user(buf, (void *) addr, len);
+			copy_from_user_page(vma, NULL, NULL,
+					    buf, (void *) addr, len);
 		else
 			len = 0;
 	} else {
-- 
1.6.5.3

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