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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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861ce4a324
'__vmalloc_start_set' currently only gets set in initmem_init() when !CONFIG_NEED_MULTIPLE_NODES. This breaks detection of vmalloc address with virt_addr_valid() with CONFIG_NEED_MULTIPLE_NODES=y, causing a kernel crash: [mm/usercopy]517e1fbeb6: kernel BUG at arch/x86/mm/physaddr.c:78! Set '__vmalloc_start_set' appropriately for that case as well. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes:dc16ecf7fd("x86-32: use specific __vmalloc_start_set flag in __virt_addr_valid") Link: http://lkml.kernel.org/r/1494278596-30373-1-git-send-email-labbott@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
/*
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* Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
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* August 2002: added remote node KVA remap - Martin J. Bligh
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#include <linux/init.h>
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#include "numa_internal.h"
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#ifdef CONFIG_DISCONTIGMEM
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/*
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* 4) physnode_map - the mapping between a pfn and owning node
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* physnode_map keeps track of the physical memory layout of a generic
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* numa node on a 64Mb break (each element of the array will
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* represent 64Mb of memory and will be marked by the node id. so,
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* if the first gig is on node 0, and the second gig is on node 1
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* physnode_map will contain:
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*
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* physnode_map[0-15] = 0;
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* physnode_map[16-31] = 1;
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* physnode_map[32- ] = -1;
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*/
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s8 physnode_map[MAX_SECTIONS] __read_mostly = { [0 ... (MAX_SECTIONS - 1)] = -1};
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EXPORT_SYMBOL(physnode_map);
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void memory_present(int nid, unsigned long start, unsigned long end)
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{
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unsigned long pfn;
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printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n",
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nid, start, end);
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printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid);
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printk(KERN_DEBUG " ");
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start = round_down(start, PAGES_PER_SECTION);
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end = round_up(end, PAGES_PER_SECTION);
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for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) {
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physnode_map[pfn / PAGES_PER_SECTION] = nid;
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printk(KERN_CONT "%lx ", pfn);
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}
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printk(KERN_CONT "\n");
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}
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unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
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unsigned long end_pfn)
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{
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unsigned long nr_pages = end_pfn - start_pfn;
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if (!nr_pages)
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return 0;
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return (nr_pages + 1) * sizeof(struct page);
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}
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#endif
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extern unsigned long highend_pfn, highstart_pfn;
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void __init initmem_init(void)
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{
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x86_numa_init();
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#ifdef CONFIG_HIGHMEM
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highstart_pfn = highend_pfn = max_pfn;
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if (max_pfn > max_low_pfn)
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highstart_pfn = max_low_pfn;
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printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
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pages_to_mb(highend_pfn - highstart_pfn));
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high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
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#else
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high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1;
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#endif
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printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
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pages_to_mb(max_low_pfn));
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printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n",
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max_low_pfn, highstart_pfn);
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printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(max_low_pfn));
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printk(KERN_DEBUG "High memory starts at vaddr %08lx\n",
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(ulong) pfn_to_kaddr(highstart_pfn));
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__vmalloc_start_set = true;
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setup_bootmem_allocator();
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}
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