72a7fe3967
This patchset adds a flags variable to reserve_bootmem() and uses the BOOTMEM_EXCLUSIVE flag in crashkernel reservation code to detect collisions between crashkernel area and already used memory. This patch: Change the reserve_bootmem() function to accept a new flag BOOTMEM_EXCLUSIVE. If that flag is set, the function returns with -EBUSY if the memory already has been reserved in the past. This is to avoid conflicts. Because that code runs before SMP initialisation, there's no race condition inside reserve_bootmem_core(). [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: fix powerpc build] Signed-off-by: Bernhard Walle <bwalle@suse.de> Cc: <linux-arch@vger.kernel.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* arch/sh/mm/numa.c - Multiple node support for SH machines
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*
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* Copyright (C) 2007 Paul Mundt
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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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#include <linux/module.h>
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#include <linux/bootmem.h>
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#include <linux/mm.h>
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#include <linux/numa.h>
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#include <linux/pfn.h>
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#include <asm/sections.h>
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static bootmem_data_t plat_node_bdata[MAX_NUMNODES];
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struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
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EXPORT_SYMBOL_GPL(node_data);
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/*
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* On SH machines the conventional approach is to stash system RAM
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* in node 0, and other memory blocks in to node 1 and up, ordered by
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* latency. Each node's pgdat is node-local at the beginning of the node,
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* immediately followed by the node mem map.
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*/
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void __init setup_memory(void)
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{
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unsigned long free_pfn = PFN_UP(__pa(_end));
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/*
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* Node 0 sets up its pgdat at the first available pfn,
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* and bumps it up before setting up the bootmem allocator.
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*/
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NODE_DATA(0) = pfn_to_kaddr(free_pfn);
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memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
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free_pfn += PFN_UP(sizeof(struct pglist_data));
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NODE_DATA(0)->bdata = &plat_node_bdata[0];
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/* Set up node 0 */
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setup_bootmem_allocator(free_pfn);
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/* Give the platforms a chance to hook up their nodes */
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plat_mem_setup();
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}
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void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
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{
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unsigned long bootmap_pages, bootmap_start, bootmap_size;
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unsigned long start_pfn, free_pfn, end_pfn;
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/* Don't allow bogus node assignment */
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BUG_ON(nid > MAX_NUMNODES || nid == 0);
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/*
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* The free pfn starts at the beginning of the range, and is
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* advanced as necessary for pgdat and node map allocations.
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*/
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free_pfn = start_pfn = start >> PAGE_SHIFT;
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end_pfn = end >> PAGE_SHIFT;
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add_active_range(nid, start_pfn, end_pfn);
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/* Node-local pgdat */
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NODE_DATA(nid) = pfn_to_kaddr(free_pfn);
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free_pfn += PFN_UP(sizeof(struct pglist_data));
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memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
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NODE_DATA(nid)->bdata = &plat_node_bdata[nid];
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NODE_DATA(nid)->node_start_pfn = start_pfn;
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NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
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/* Node-local bootmap */
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bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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bootmap_start = (unsigned long)pfn_to_kaddr(free_pfn);
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bootmap_size = init_bootmem_node(NODE_DATA(nid), free_pfn, start_pfn,
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end_pfn);
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free_bootmem_with_active_regions(nid, end_pfn);
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/* Reserve the pgdat and bootmap space with the bootmem allocator */
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reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
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sizeof(struct pglist_data), BOOTMEM_DEFAULT);
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reserve_bootmem_node(NODE_DATA(nid), free_pfn << PAGE_SHIFT,
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bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
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/* It's up */
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node_set_online(nid);
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/* Kick sparsemem */
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sparse_memory_present_with_active_regions(nid);
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}
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