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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>
hifive-unleashed-5.1
Paul Mundt 2010-02-16 17:14:04 +09:00
parent 319c2cc761
commit 55cef91a5d
1 changed files with 1 additions and 1 deletions
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2
arch/sh/mm/pmb.c
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@ -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;
}