929f97276b
Modify the gen_pool allocator (lib/genalloc.c) to utilize a bitmap scheme instead of the buddy scheme. The purpose of this change is to eliminate the touching of the actual memory being allocated. Since the change modifies the interface, a change to the uncached allocator (arch/ia64/kernel/uncached.c) is also required. Both Andrey Volkov and Jes Sorenson have expressed a desire that the gen_pool allocator not write to the memory being managed. See the following: http://marc.theaimsgroup.com/?l=linux-kernel&m=113518602713125&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113533568827916&w=2 Signed-off-by: Dean Nelson <dcn@sgi.com> Cc: Andrey Volkov <avolkov@varma-el.com> Acked-by: Jes Sorensen <jes@trained-monkey.org> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001-2003, 2006 Silicon Graphics, Inc. All rights reserved.
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*
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*/
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#include <linux/module.h>
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#include <asm/pgalloc.h>
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#include <asm/sn/arch.h>
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/**
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* sn_flush_all_caches - flush a range of address from all caches (incl. L4)
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* @flush_addr: identity mapped region 7 address to start flushing
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* @bytes: number of bytes to flush
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*
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* Flush a range of addresses from all caches including L4.
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* All addresses fully or partially contained within
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* @flush_addr to @flush_addr + @bytes are flushed
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* from all caches.
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*/
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void
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sn_flush_all_caches(long flush_addr, long bytes)
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{
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unsigned long addr = flush_addr;
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/* SHub1 requires a cached address */
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if (is_shub1() && (addr & RGN_BITS) == RGN_BASE(RGN_UNCACHED))
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addr = (addr - RGN_BASE(RGN_UNCACHED)) + RGN_BASE(RGN_KERNEL);
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flush_icache_range(addr, addr + bytes);
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/*
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* The last call may have returned before the caches
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* were actually flushed, so we call it again to make
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* sure.
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*/
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flush_icache_range(addr, addr + bytes);
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mb();
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}
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EXPORT_SYMBOL(sn_flush_all_caches);
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