From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sun, 6 May 2007 21:50:09 +0000 (-0700)
Subject: get_unmapped_area handles MAP_FIXED on parisc
X-Git-Tag: v2.6.22-rc1~932
X-Git-Url: https://git.kernelconcepts.de/?a=commitdiff_plain;h=869e5101728fe2f307f0a3c3cf599c184f81f0ee;p=karo-tx-linux.git

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@kernel.crashing.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Grant Grundler <grundler@parisc-linux.org>
Cc: Matthew Wilcox <willy@debian.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/arch/parisc/kernel/sys_parisc.c b/arch/parisc/kernel/sys_parisc.c
index 512642d8f707..6fed0803c593 100644
--- a/arch/parisc/kernel/sys_parisc.c
+++ b/arch/parisc/kernel/sys_parisc.c
@@ -106,6 +106,11 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr,
 {
 	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;