From 55cef91a5d553265f03fe159f9fcdfac36902248 Mon Sep 17 00:00:00 2001
From: Paul Mundt <lethal@linux-sh.org>
Date: Tue, 16 Feb 2010 17:14:04 +0900
Subject: sh: Prevent fixed slot PMB remapping from clobbering boot entries.

The PMB initialization code walks the entries and synchronizes the
software PMB state with the hardware mappings, preserving the slot index.
Unfortunately pmb_alloc() only tested the bit position in the entry map
and failed to set it, resulting in subsequent remaps being able to be
dynamically assigned a slot that trampled an existing boot mapping with
general badness ensuing.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 3c9bf5b..a064830 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -77,7 +77,7 @@ static struct pmb_entry *pmb_alloc(unsigned long vpn, unsigned long ppn,
 		if (pos < 0)
 			return ERR_PTR(pos);
 	} else {
-		if (test_bit(entry, &pmb_map))
+		if (test_and_set_bit(entry, &pmb_map))
 			return ERR_PTR(-ENOSPC);
 		pos = entry;
 	}
-- 
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