forked from luck/tmp_suning_uos_patched
mm: allow reserve_bootmem() cross nodes
split reserve_bootmem_core() into two functions, one which checks conflicts, and one which sets the bits. and make reserve_bootmem to loop bdata_list to cross the nodes. user could be crashkernel and ramdisk..., in case the range provided by those externalities crosses the nodes. Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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9a2dc04cf0
commit
a5645a61b3
94
mm/bootmem.c
94
mm/bootmem.c
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@ -111,44 +111,74 @@ static unsigned long __init init_bootmem_core(pg_data_t *pgdat,
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* might be used for boot-time allocations - or it might get added
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* to the free page pool later on.
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*/
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static int __init reserve_bootmem_core(bootmem_data_t *bdata,
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static int __init can_reserve_bootmem_core(bootmem_data_t *bdata,
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unsigned long addr, unsigned long size, int flags)
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{
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unsigned long sidx, eidx;
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unsigned long i;
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int ret;
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BUG_ON(!size);
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/* out of range, don't hold other */
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if (addr + size < bdata->node_boot_start ||
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PFN_DOWN(addr) > bdata->node_low_pfn)
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return 0;
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/*
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* round up, partially reserved pages are considered
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* fully reserved.
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* Round up to index to the range.
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*/
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BUG_ON(!size);
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BUG_ON(PFN_DOWN(addr) >= bdata->node_low_pfn);
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BUG_ON(PFN_UP(addr + size) > bdata->node_low_pfn);
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BUG_ON(addr < bdata->node_boot_start);
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if (addr > bdata->node_boot_start)
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sidx= PFN_DOWN(addr - bdata->node_boot_start);
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else
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sidx = 0;
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sidx = PFN_DOWN(addr - bdata->node_boot_start);
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eidx = PFN_UP(addr + size - bdata->node_boot_start);
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if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
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eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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for (i = sidx; i < eidx; i++)
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for (i = sidx; i < eidx; i++) {
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if (test_bit(i, bdata->node_bootmem_map)) {
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if (flags & BOOTMEM_EXCLUSIVE)
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return -EBUSY;
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}
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}
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return 0;
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}
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static void __init reserve_bootmem_core(bootmem_data_t *bdata,
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unsigned long addr, unsigned long size, int flags)
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{
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unsigned long sidx, eidx;
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unsigned long i;
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BUG_ON(!size);
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/* out of range */
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if (addr + size < bdata->node_boot_start ||
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PFN_DOWN(addr) > bdata->node_low_pfn)
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return;
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/*
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* Round up to index to the range.
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*/
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if (addr > bdata->node_boot_start)
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sidx= PFN_DOWN(addr - bdata->node_boot_start);
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else
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sidx = 0;
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eidx = PFN_UP(addr + size - bdata->node_boot_start);
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if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
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eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
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for (i = sidx; i < eidx; i++) {
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if (test_and_set_bit(i, bdata->node_bootmem_map)) {
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#ifdef CONFIG_DEBUG_BOOTMEM
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printk("hm, page %08lx reserved twice.\n", i*PAGE_SIZE);
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#endif
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if (flags & BOOTMEM_EXCLUSIVE) {
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ret = -EBUSY;
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goto err;
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}
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}
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return 0;
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err:
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/* unreserve memory we accidentally reserved */
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for (i--; i >= sidx; i--)
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clear_bit(i, bdata->node_bootmem_map);
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return ret;
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}
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}
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static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
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@ -415,6 +445,11 @@ unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
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void __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
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unsigned long size, int flags)
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{
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int ret;
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ret = can_reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
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if (ret < 0)
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return;
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reserve_bootmem_core(pgdat->bdata, physaddr, size, flags);
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}
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@ -440,7 +475,18 @@ unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
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int __init reserve_bootmem(unsigned long addr, unsigned long size,
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int flags)
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{
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return reserve_bootmem_core(NODE_DATA(0)->bdata, addr, size, flags);
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bootmem_data_t *bdata;
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int ret;
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list_for_each_entry(bdata, &bdata_list, list) {
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ret = can_reserve_bootmem_core(bdata, addr, size, flags);
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if (ret < 0)
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return ret;
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}
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list_for_each_entry(bdata, &bdata_list, list)
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reserve_bootmem_core(bdata, addr, size, flags);
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return 0;
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}
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#endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */
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