linux-kernel - [PATCH 7/12] get_unmapped_area handles MAP

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Message-Id: <20070424053339.D189DDDF0D@ozlabs.org>
Date:	Tue, 24 Apr 2007 15:33:37 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-kernel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: [PATCH 7/12] get_unmapped_area handles MAP_FIXED on parisc

Handle MAP_FIXED in parisc arch_get_unmapped_area(), just return the
address. We might want to also check for possible cache aliasing
issues now that we get called in that case (like ARM or MIPS),
leave a comment for the maintainers to pick up.

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

 arch/parisc/kernel/sys_parisc.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-cell/arch/parisc/kernel/sys_parisc.c
===================================================================
--- linux-cell.orig/arch/parisc/kernel/sys_parisc.c	2007-03-22 15:28:05.000000000 +1100
+++ linux-cell/arch/parisc/kernel/sys_parisc.c	2007-03-22 15:29:08.000000000 +1100
@@ -106,6 +106,11 @@ unsigned long arch_get_unmapped_area(str
 {
 	if (len > TASK_SIZE)
 		return -ENOMEM;
+	/* Might want to check for cache aliasing issues for MAP_FIXED case
+	 * like ARM or MIPS ??? --BenH.
+	 */
+	if (flags & MAP_FIXED)
+		return addr;
 	if (!addr)
 		addr = TASK_UNMAPPED_BASE;
 
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