alpha: switch to NO_BOOTMEM

Replace bootmem allocator with memblock and enable use of NO_BOOTMEM like
on most other architectures.

Alpha gets the description of the physical memory from the firmware as an
array of memory clusters.  Each cluster that is not reserved by the
firmware is added to memblock.memory.

Once the memblock.memory is set up, we reserve the kernel and initrd pages
with memblock reserve.

Since we don't need the bootmem bitmap anymore, the code that finds an
appropriate place is removed.

The conversion does not take care of NUMA support which is marked broken
for more than 10 years now.

Link: http://lkml.kernel.org/r/1535952894-10967-1-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 13 insertions, 100 deletions

diff --git a/arch/alpha/mm/numa.c b/arch/alpha/mm/numa.c
index a9e86475f169..26cd925d19b1 100644
--- a/arch/alpha/mm/numa.c
+++ b/arch/alpha/mm/numa.c
@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/bootmem.h>
+#include <linux/memblock.h>
 #include <linux/swap.h>
 #include <linux/initrd.h>
 #include <linux/pfn.h>
@@ -59,12 +60,10 @@ setup_memory_node(int nid, void *kernel_end)
 	struct memclust_struct * cluster;
 	struct memdesc_struct * memdesc;
 	unsigned long start_kernel_pfn, end_kernel_pfn;
-	unsigned long bootmap_size, bootmap_pages, bootmap_start;
 	unsigned long start, end;
 	unsigned long node_pfn_start, node_pfn_end;
 	unsigned long node_min_pfn, node_max_pfn;
 	int i;
-	unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
 	int show_init = 0;
 
 	/* Find the bounds of current node */
@@ -134,24 +133,14 @@ setup_memory_node(int nid, void *kernel_end)
 	/* Cute trick to make sure our local node data is on local memory */
 	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
 #endif
-	/* Quasi-mark the pg_data_t as in-use */
-	node_min_pfn += node_datasz;
-	if (node_min_pfn >= node_max_pfn) {
-		printk(" not enough mem to reserve NODE_DATA");
-		return;
-	}
-	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
-
 	printk(" Detected node memory:   start %8lu, end %8lu\n",
 	       node_min_pfn, node_max_pfn);
 
 	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
-	DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
 
 	/* Find the bounds of kernel memory.  */
 	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
 	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
-	bootmap_start = -1;
 
 	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
 		panic("kernel loaded out of ram");
@@ -161,89 +150,11 @@ setup_memory_node(int nid, void *kernel_end)
 	   has much larger alignment than 8Mb, so it's safe. */
 	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
 
-	/* We need to know how many physically contiguous pages
-	   we'll need for the bootmap.  */
-	bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
-
-	/* Now find a good region where to allocate the bootmap.  */
-	for_each_mem_cluster(memdesc, cluster, i) {
-		if (cluster->usage & 3)
-			continue;
-
-		start = cluster->start_pfn;
-		end = start + cluster->numpages;
-
-		if (start >= node_max_pfn || end <= node_min_pfn)
-			continue;
-
-		if (end > node_max_pfn)
-			end = node_max_pfn;
-		if (start < node_min_pfn)
-			start = node_min_pfn;
-
-		if (start < start_kernel_pfn) {
-			if (end > end_kernel_pfn
-			    && end - end_kernel_pfn >= bootmap_pages) {
-				bootmap_start = end_kernel_pfn;
-				break;
-			} else if (end > start_kernel_pfn)
-				end = start_kernel_pfn;
-		} else if (start < end_kernel_pfn)
-			start = end_kernel_pfn;
-		if (end - start >= bootmap_pages) {
-			bootmap_start = start;
-			break;
-		}
-	}
-
-	if (bootmap_start == -1)
-		panic("couldn't find a contiguous place for the bootmap");
-
-	/* Allocate the bootmap and mark the whole MM as reserved.  */
-	bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
-					 node_min_pfn, node_max_pfn);
-	DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
-		 bootmap_start, bootmap_size, bootmap_pages);
+	memblock_add(PFN_PHYS(node_min_pfn),
+		     (node_max_pfn - node_min_pfn) << PAGE_SHIFT);
 
-	/* Mark the free regions.  */
-	for_each_mem_cluster(memdesc, cluster, i) {
-		if (cluster->usage & 3)
-			continue;
-
-		start = cluster->start_pfn;
-		end = cluster->start_pfn + cluster->numpages;
-
-		if (start >= node_max_pfn || end <= node_min_pfn)
-			continue;
-
-		if (end > node_max_pfn)
-			end = node_max_pfn;
-		if (start < node_min_pfn)
-			start = node_min_pfn;
-
-		if (start < start_kernel_pfn) {
-			if (end > end_kernel_pfn) {
-				free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
-					     (PFN_PHYS(start_kernel_pfn)
-					      - PFN_PHYS(start)));
-				printk(" freeing pages %ld:%ld\n",
-				       start, start_kernel_pfn);
-				start = end_kernel_pfn;
-			} else if (end > start_kernel_pfn)
-				end = start_kernel_pfn;
-		} else if (start < end_kernel_pfn)
-			start = end_kernel_pfn;
-		if (start >= end)
-			continue;
-
-		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
-		printk(" freeing pages %ld:%ld\n", start, end);
-	}
-
-	/* Reserve the bootmap memory.  */
-	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
-			bootmap_size, BOOTMEM_DEFAULT);
-	printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
+	NODE_DATA(nid)->node_start_pfn = node_min_pfn;
+	NODE_DATA(nid)->node_present_pages = node_max_pfn - node_min_pfn;
 
 	node_set_online(nid);
 }
@@ -251,6 +162,7 @@ setup_memory_node(int nid, void *kernel_end)
 void __init
 setup_memory(void *kernel_end)
 {
+	unsigned long kernel_size;
 	int nid;
 
 	show_mem_layout();
@@ -262,6 +174,9 @@ setup_memory(void *kernel_end)
 	for (nid = 0; nid < MAX_NUMNODES; nid++)
 		setup_memory_node(nid, kernel_end);
 
+	kernel_size = virt_to_phys(kernel_end) - KERNEL_START_PHYS;
+	memblock_reserve(KERNEL_START_PHYS, kernel_size);
+
 #ifdef CONFIG_BLK_DEV_INITRD
 	initrd_start = INITRD_START;
 	if (initrd_start) {
@@ -279,9 +194,8 @@ setup_memory(void *kernel_end)
 				       phys_to_virt(PFN_PHYS(max_low_pfn)));
 		} else {
 			nid = kvaddr_to_nid(initrd_start);
-			reserve_bootmem_node(NODE_DATA(nid),
-					     virt_to_phys((void *)initrd_start),
-					     INITRD_SIZE, BOOTMEM_DEFAULT);
+			memblock_reserve(virt_to_phys((void *)initrd_start),
+					 INITRD_SIZE);
 		}
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */
@@ -303,9 +217,8 @@ void __init paging_init(void)
 	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 
 	for_each_online_node(nid) {
-		bootmem_data_t *bdata = &bootmem_node_data[nid];
-		unsigned long start_pfn = bdata->node_min_pfn;
-		unsigned long end_pfn = bdata->node_low_pfn;
+		unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn;
+		unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_present_pages;
 
 		if (dma_local_pfn >= end_pfn - start_pfn)
 			zones_size[ZONE_DMA] = end_pfn - start_pfn;