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>

1 files changed, 5 insertions, 0 deletions

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;