Introduce flags for reserve_bootmem()

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>

arch/alpha/kernel/core_irongate.c

@@ -241,7 +241,8 @@ albacore_init_arch(void)
 				       size / 1024);
 		}
 #endif
-		reserve_bootmem_node(NODE_DATA(0), pci_mem, memtop - pci_mem);
+		reserve_bootmem_node(NODE_DATA(0), pci_mem, memtop -
+				pci_mem, BOOTMEM_DEFAULT);
 		printk("irongate_init_arch: temporarily reserving "
 			"region %08lx-%08lx for PCI\n", pci_mem, memtop - 1);
 	}

arch/alpha/kernel/setup.c

@@ -428,7 +428,8 @@ setup_memory(void *kernel_end)
 	}
 
 	/* Reserve the bootmap memory.  */
-	reserve_bootmem(PFN_PHYS(bootmap_start), bootmap_size);
+	reserve_bootmem(PFN_PHYS(bootmap_start), bootmap_size,
+			BOOTMEM_DEFAULT);
 	printk("reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -446,7 +447,7 @@ setup_memory(void *kernel_end)
 				       phys_to_virt(PFN_PHYS(max_low_pfn)));
 		} else {
 			reserve_bootmem(virt_to_phys((void *)initrd_start),
-					INITRD_SIZE);
+					INITRD_SIZE, BOOTMEM_DEFAULT);
 		}
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */

arch/alpha/mm/numa.c

@@ -242,7 +242,8 @@ setup_memory_node(int nid, void *kernel_end)
 	}
 
 	/* Reserve the bootmap memory.  */
-	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start), bootmap_size);
+	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_set_online(nid);
@@ -281,7 +282,7 @@ setup_memory(void *kernel_end)
 			nid = kvaddr_to_nid(initrd_start);
 			reserve_bootmem_node(NODE_DATA(nid),
 					     virt_to_phys((void *)initrd_start),
-					     INITRD_SIZE);
+					     INITRD_SIZE, BOOTMEM_DEFAULT);
 		}
 	}
 #endif /* CONFIG_BLK_DEV_INITRD */

arch/arm/mm/init.c

@@ -239,7 +239,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
 	 * Reserve the bootmem bitmap for this node.
 	 */
 	reserve_bootmem_node(pgdat, boot_pfn << PAGE_SHIFT,
-			     boot_pages << PAGE_SHIFT);
+			     boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	/*
@@ -247,7 +247,7 @@ bootmem_init_node(int node, int initrd_node, struct meminfo *mi)
 	 */
 	if (node == initrd_node) {
 		reserve_bootmem_node(pgdat, phys_initrd_start,
-				     phys_initrd_size);
+				     phys_initrd_size, BOOTMEM_DEFAULT);
 		initrd_start = __phys_to_virt(phys_initrd_start);
 		initrd_end = initrd_start + phys_initrd_size;
 	}

arch/arm/mm/mmu.c

@@ -605,9 +605,11 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	 * Note that this can only be in node 0.
 	 */
 #ifdef CONFIG_XIP_KERNEL
-	reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+	reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start,
+			BOOTMEM_DEFAULT);
 #else
-	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext,
+			BOOTMEM_DEFAULT);
 #endif
 
 	/*
@@ -615,7 +617,7 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	 * and can only be in node 0.
 	 */
 	reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
-			     PTRS_PER_PGD * sizeof(pgd_t));
+			     PTRS_PER_PGD * sizeof(pgd_t), BOOTMEM_DEFAULT);
 
 	/*
 	 * Hmm... This should go elsewhere, but we really really need to
@@ -638,8 +640,10 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	/* H1940 and RX3715 need to reserve this for suspend */
 
 	if (machine_is_h1940() || machine_is_rx3715()) {
-		reserve_bootmem_node(pgdat, 0x30003000, 0x1000);
+		reserve_bootmem_node(pgdat, 0x30003000, 0x1000,
-		reserve_bootmem_node(pgdat, 0x30081000, 0x1000);
+				BOOTMEM_DEFAULT);
+		reserve_bootmem_node(pgdat, 0x30081000, 0x1000,
+				BOOTMEM_DEFAULT);
 	}
 
 #ifdef CONFIG_SA1111
@@ -650,7 +654,8 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
 #endif
 	if (res_size)
-		reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
+		reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size,
+				BOOTMEM_DEFAULT);
 }
 
 /*

arch/arm/mm/nommu.c

@@ -27,9 +27,11 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	 * Note that this can only be in node 0.
 	 */
 #ifdef CONFIG_XIP_KERNEL
-	reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+	reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start,
+			BOOTMEM_DEFAULT);
 #else
-	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext,
+			BOOTMEM_DEFAULT);
 #endif
 
 	/*
@@ -37,7 +39,8 @@ void __init reserve_node_zero(pg_data_t *pgdat)
 	 * some architectures which the DRAM is the exception vector to trap,
 	 * alloc_page breaks with error, although it is not NULL, but "0."
 	 */
-	reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE);
+	reserve_bootmem_node(pgdat, CONFIG_VECTORS_BASE, PAGE_SIZE,
+			BOOTMEM_DEFAULT);
 }
 
 /*

arch/arm/plat-omap/fb.c

@@ -207,7 +207,7 @@ void __init omapfb_reserve_sdram(void)
 			return;
 		}
 		if (rg.paddr)
-			reserve_bootmem(rg.paddr, rg.size);
+			reserve_bootmem(rg.paddr, rg.size, BOOTMEM_DEFAULT);
 		reserved += rg.size;
 		omapfb_config.mem_desc.region[i] = rg;
 		configured_regions++;

arch/avr32/kernel/setup.c

@@ -489,7 +489,8 @@ static void __init setup_bootmem(void)
 		/* Reserve space for the bootmem bitmap... */
 		reserve_bootmem_node(NODE_DATA(node),
 				     PFN_PHYS(bootmap_pfn),
-				     bootmap_size);
+				     bootmap_size,
+				     BOOTMEM_DEFAULT);
 
 		/* ...and any other reserved regions. */
 		for (res = reserved; res; res = res->sibling) {
@@ -505,7 +506,8 @@ static void __init setup_bootmem(void)
 			    && res->end < PFN_PHYS(max_pfn))
 				reserve_bootmem_node(
 					NODE_DATA(node), res->start,
-					res->end - res->start + 1);
+					res->end - res->start + 1,
+					BOOTMEM_DEFAULT);
 		}
 
 		node_set_online(node);

arch/blackfin/kernel/setup.c

@@ -406,7 +406,7 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	free_bootmem(memory_start, memory_end - memory_start);
 
-	reserve_bootmem(memory_start, bootmap_size);
+	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
 	/*
 	 * get kmalloc into gear
 	 */

arch/cris/kernel/setup.c

@@ -137,7 +137,7 @@ setup_arch(char **cmdline_p)
 	 * Arguments are start, size
          */
 
-        reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size);
+	reserve_bootmem(PFN_PHYS(start_pfn), bootmap_size, BOOTMEM_DEFAULT);
 
 	/* paging_init() sets up the MMU and marks all pages as reserved */
 

arch/frv/kernel/setup.c

@@ -925,13 +925,15 @@ static void __init setup_linux_memory(void)
 #endif
 
 	/* take back the memory occupied by the kernel image and the bootmem alloc map */
-	reserve_bootmem(kstart, kend - kstart + bootmap_size);
+	reserve_bootmem(kstart, kend - kstart + bootmap_size,
+			BOOTMEM_DEFAULT);
 
 	/* reserve the memory occupied by the initial ramdisk */
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (LOADER_TYPE && INITRD_START) {
 		if (INITRD_START + INITRD_SIZE <= (low_top_pfn << PAGE_SHIFT)) {
-			reserve_bootmem(INITRD_START, INITRD_SIZE);
+			reserve_bootmem(INITRD_START, INITRD_SIZE,
+					BOOTMEM_DEFAULT);
 			initrd_start = INITRD_START + PAGE_OFFSET;
 			initrd_end = initrd_start + INITRD_SIZE;
 		}
@@ -986,9 +988,10 @@ static void __init setup_uclinux_memory(void)
 
 	/* now take back the bits the core kernel is occupying */
 #ifndef CONFIG_PROTECT_KERNEL
-	reserve_bootmem(kend, bootmap_size);
+	reserve_bootmem(kend, bootmap_size, BOOTMEM_DEFAULT);
 	reserve_bootmem((unsigned long) &__kernel_image_start,
-			kend - (unsigned long) &__kernel_image_start);
+			kend - (unsigned long) &__kernel_image_start,
+			BOOTMEM_DEFAULT);
 
 #else
 	dampr = __get_DAMPR(0);
@@ -996,14 +999,15 @@ static void __init setup_uclinux_memory(void)
 	dampr = (dampr >> 4) + 17;
 	dampr = 1 << dampr;
 
-	reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr);
+	reserve_bootmem(__get_DAMPR(0) & xAMPRx_PPFN, dampr, BOOTMEM_DEFAULT);
 #endif
 
 	/* reserve some memory to do uncached DMA through if requested */
 #ifdef CONFIG_RESERVE_DMA_COHERENT
 	if (dma_coherent_mem_start)
 		reserve_bootmem(dma_coherent_mem_start,
-				dma_coherent_mem_end - dma_coherent_mem_start);
+				dma_coherent_mem_end - dma_coherent_mem_start,
+				BOOTMEM_DEFAULT);
 #endif
 
 } /* end setup_uclinux_memory() */

arch/h8300/kernel/setup.c

@@ -173,7 +173,7 @@ void __init setup_arch(char **cmdline_p)
 	 * the bootmem bitmap so we then reserve it after freeing it :-)
 	 */
 	free_bootmem(memory_start, memory_end - memory_start);
-	reserve_bootmem(memory_start, bootmap_size);
+	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
 	/*
 	 * get kmalloc into gear
 	 */

arch/ia64/mm/contig.c

@@ -218,7 +218,7 @@ find_memory (void)
 
 	/* Free all available memory, then mark bootmem-map as being in use. */
 	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
-	reserve_bootmem(bootmap_start, bootmap_size);
+	reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
 
 	find_initrd();
 

arch/ia64/mm/discontig.c

@@ -299,12 +299,12 @@ static void __init reserve_pernode_space(void)
 		pages = bdp->node_low_pfn - (bdp->node_boot_start>>PAGE_SHIFT);
 		size = bootmem_bootmap_pages(pages) << PAGE_SHIFT;
 		base = __pa(bdp->node_bootmem_map);
-		reserve_bootmem_node(pdp, base, size);
+		reserve_bootmem_node(pdp, base, size, BOOTMEM_DEFAULT);
 
 		/* Now the per-node space */
 		size = mem_data[node].pernode_size;
 		base = __pa(mem_data[node].pernode_addr);
-		reserve_bootmem_node(pdp, base, size);
+		reserve_bootmem_node(pdp, base, size, BOOTMEM_DEFAULT);
 	}
 }
 

arch/m32r/kernel/setup.c

@@ -177,25 +177,28 @@ static unsigned long __init setup_memory(void)
 	 */
 	reserve_bootmem(CONFIG_MEMORY_START + PAGE_SIZE,
 		(PFN_PHYS(start_pfn) + bootmap_size + PAGE_SIZE - 1)
-		- CONFIG_MEMORY_START);
+		- CONFIG_MEMORY_START,
+		BOOTMEM_DEFAULT);
 
 	/*
 	 * reserve physical page 0 - it's a special BIOS page on many boxes,
 	 * enabling clean reboots, SMP operation, laptop functions.
 	 */
-	reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE);
+	reserve_bootmem(CONFIG_MEMORY_START, PAGE_SIZE, BOOTMEM_DEFAULT);
 
 	/*
 	 * reserve memory hole
 	 */
 #ifdef CONFIG_MEMHOLE
-	reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE);
+	reserve_bootmem(CONFIG_MEMHOLE_START, CONFIG_MEMHOLE_SIZE,
+			BOOTMEM_DEFAULT);
 #endif
 
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (LOADER_TYPE && INITRD_START) {
 		if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
-			reserve_bootmem(INITRD_START, INITRD_SIZE);
+			reserve_bootmem(INITRD_START, INITRD_SIZE,
+					BOOTMEM_DEFAULT);
 			initrd_start = INITRD_START + PAGE_OFFSET;
 			initrd_end = initrd_start + INITRD_SIZE;
 			printk("initrd:start[%08lx],size[%08lx]\n",

arch/m32r/mm/discontig.c

@@ -91,7 +91,8 @@ unsigned long __init setup_memory(void)
 			PFN_PHYS(mp->pages));
 
 		reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(mp->start_pfn),
-			PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size);
+			PFN_PHYS(mp->free_pfn - mp->start_pfn) + bootmap_size,
+			BOOTMEM_DEFAULT);
 
 		if (max_low_pfn < max_pfn)
 			max_low_pfn = max_pfn;
@@ -104,7 +105,7 @@ unsigned long __init setup_memory(void)
 	if (LOADER_TYPE && INITRD_START) {
 		if (INITRD_START + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
 			reserve_bootmem_node(NODE_DATA(0), INITRD_START,
-				INITRD_SIZE);
+				INITRD_SIZE, BOOTMEM_DEFAULT);
 			initrd_start = INITRD_START + PAGE_OFFSET;
 			initrd_end = initrd_start + INITRD_SIZE;
 			printk("initrd:start[%08lx],size[%08lx]\n",

arch/m68k/atari/stram.c

@@ -154,7 +154,7 @@ void __init atari_stram_reserve_pages(void *start_mem)
 	/* always reserve first page of ST-RAM, the first 2 kB are
 	 * supervisor-only! */
 	if (!kernel_in_stram)
-		reserve_bootmem (0, PAGE_SIZE);
+		reserve_bootmem(0, PAGE_SIZE, BOOTMEM_DEFAULT);
 
 }
 

arch/m68k/kernel/setup.c

@@ -323,7 +323,8 @@ void __init setup_arch(char **cmdline_p)
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (m68k_ramdisk.size) {
 		reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),
-				     m68k_ramdisk.addr, m68k_ramdisk.size);
+				     m68k_ramdisk.addr, m68k_ramdisk.size,
+				     BOOTMEM_DEFAULT);
 		initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 		initrd_end = initrd_start + m68k_ramdisk.size;
 		printk("initrd: %08lx - %08lx\n", initrd_start, initrd_end);

arch/m68knommu/kernel/setup.c

@@ -203,7 +203,7 @@ void __init setup_arch(char **cmdline_p)
 	 * the bootmem bitmap so we then reserve it after freeing it :-)
 	 */
 	free_bootmem(memory_start, memory_end - memory_start);
-	reserve_bootmem(memory_start, bootmap_size);
+	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);
 
 	/*
 	 * Get kmalloc into gear.

arch/mips/kernel/setup.c

@@ -232,7 +232,7 @@ static void __init finalize_initrd(void)
 		goto disable;
 	}
 
-	reserve_bootmem(__pa(initrd_start), size);
+	reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 	initrd_below_start_ok = 1;
 
 	printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
@@ -413,7 +413,7 @@ static void __init bootmem_init(void)
 	/*
 	 * Reserve the bootmap memory.
 	 */
-	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
+	reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 
 	/*
 	 * Reserve initrd memory if needed.