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sh: Fix alias calculation for non-aliasing cases.

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There was an off-by-1 on the cache alias detection logic on SH-4,
which caused n_aliases to always be 1 even when the page size
precluded the existence of aliases.

With this corrected, 64KB pages happily reports n_aliases == 0, and
hits the appropriate fast paths in the flushing routines.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2007-09-24 16:38:25 +09:00
parent 1a442fe02d
commit d10040f7eb
1 changed files with 2 additions and 2 deletions
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4
arch/sh/mm/cache-sh4.c
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@ -2,7 +2,7 @@
* arch/sh/mm/cache-sh4.c * arch/sh/mm/cache-sh4.c
* *
* Copyright (C) 1999, 2000, 2002 Niibe Yutaka * Copyright (C) 1999, 2000, 2002 Niibe Yutaka
* Copyright (C) 2001 - 2006 Paul Mundt * Copyright (C) 2001 - 2007 Paul Mundt
* Copyright (C) 2003 Richard Curnow * Copyright (C) 2003 Richard Curnow
* *
* This file is subject to the terms and conditions of the GNU General Public * This file is subject to the terms and conditions of the GNU General Public
@ -44,7 +44,7 @@ static void (*__flush_dcache_segment_fn)(unsigned long, unsigned long) =
static void compute_alias(struct cache_info *c) static void compute_alias(struct cache_info *c)
{ {
c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1); c->alias_mask = ((c->sets - 1) << c->entry_shift) & ~(PAGE_SIZE - 1);
c->n_aliases = (c->alias_mask >> PAGE_SHIFT) + 1; c->n_aliases = c->alias_mask ? (c->alias_mask >> PAGE_SHIFT) + 1 : 0;
} }
static void __init emit_cache_params(void) static void __init emit_cache_params(void)