8dfcc9ba27
Have an explicit mm call to split higher order pages into individual pages. Should help to avoid bugs and be more explicit about the code's intention. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Russell King <rmk@arm.linux.org.uk> Cc: David Howells <dhowells@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Chris Zankel <chris@zankel.net> Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
72 lines
1.2 KiB
C
72 lines
1.2 KiB
C
/*
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* arch/xtensa/mm/fault.c
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*
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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 - 2005 Tensilica Inc.
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*
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* Chris Zankel <chris@zankel.net>
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*/
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#if (DCACHE_SIZE > PAGE_SIZE)
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pte_t* pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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pte_t *pte = NULL, *p;
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int color = ADDR_COLOR(address);
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int i;
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p = (pte_t*) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, COLOR_ORDER);
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if (likely(p)) {
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split_page(virt_to_page(p), COLOR_ORDER);
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for (i = 0; i < COLOR_SIZE; i++) {
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if (ADDR_COLOR(p) == color)
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pte = p;
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else
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free_page(p);
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p += PTRS_PER_PTE;
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}
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clear_page(pte);
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}
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return pte;
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}
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#ifdef PROFILING
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int mask;
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int hit;
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int flush;
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#endif
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struct page* pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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struct page *page = NULL, *p;
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int color = ADDR_COLOR(address);
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p = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
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if (likely(p)) {
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split_page(p, COLOR_ORDER);
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for (i = 0; i < PAGE_ORDER; i++) {
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if (PADDR_COLOR(page_address(p)) == color)
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page = p;
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else
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__free_page(p);
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p++;
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}
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clear_highpage(page);
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}
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return page;
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}
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#endif
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