linux-kernel - [RFC/PATCH 13/15] get_unmapped_area handles MAP

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Date:	Thu, 22 Mar 2007 17:01:29 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linux Memory Management <linux-mm@...ck.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: [RFC/PATCH 13/15] get_unmapped_area handles MAP_FIXED in /dev/mem (nommu)

This also fixes a bug, I think, it used to return a pgoff (pfn)
instead of an address. (To split ?)

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---

 drivers/char/mem.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux-cell/drivers/char/mem.c
===================================================================
--- linux-cell.orig/drivers/char/mem.c	2007-03-22 16:24:04.000000000 +1100
+++ linux-cell/drivers/char/mem.c	2007-03-22 16:26:30.000000000 +1100
@@ -246,9 +246,12 @@ static unsigned long get_unmapped_area_m
 					   unsigned long pgoff,
 					   unsigned long flags)
 {
+	if (flags & MAP_FIXED)
+		if ((addr >> PAGE_SHIFT) != pgoff)
+			return (unsigned long) -EINVAL;
 	if (!valid_mmap_phys_addr_range(pgoff, len))
 		return (unsigned long) -EINVAL;
-	return pgoff;
+	return pgoff << PAGE_SHIFT;
 }
 
 /* can't do an in-place private mapping if there's no MMU */
-
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