[PATCH 33/50] memblock: Add ARCH_DISCARD_MEMBLOCK to put memblock code to .init

[Yinghai Lu <yinghai@kernel.org>]

So those memblock bits could be released after kernel is booted up.

Arch code could define ARCH_DISCARD_MEMBLOCK in asm/memblock.h,
__init_memblock will become __init, __initdata_memblock will becom __initdata

x86 code will use that.

if ARCH_DISCARD_MEMBLOCK is defined, debugfs is not used

-v2: use ARCH_DISCARD_MEMBLOCK according to Michael Ellerman

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 include/linux/memblock.h |    8 +++++++
 mm/memblock.c            |   48 +++++++++++++++++++++++-----------------------
 2 files changed, 32 insertions(+), 24 deletions(-)

diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 4aaaf0d..751a4eb 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -148,6 +148,14 @@ static inline unsigned long memblock_region_pages(const struct memblock_region *
 	     region++)
 
 
+#ifdef ARCH_DISCARD_MEMBLOCK
+#define __init_memblock __init
+#define __initdata_memblock __initdata
+#else
+#define __init_memblock
+#define __initdata_memblock
+#endif
+
 #endif /* CONFIG_HAVE_MEMBLOCK */
 
 #endif /* __KERNEL__ */
diff --git a/mm/memblock.c b/mm/memblock.c
index 3d0a754..7471dac 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -20,12 +20,12 @@
 #include <linux/seq_file.h>
 #include <linux/memblock.h>
 
-struct memblock memblock;
+struct memblock memblock __initdata_memblock;
 
-int memblock_debug;
-int memblock_can_resize;
-static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1];
-struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1];
+int memblock_debug __initdata_memblock;
+int memblock_can_resize __initdata_memblock;
+static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
+struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
 
 /* inline so we don't get a warning when pr_debug is compiled out */
 static inline const char *memblock_type_name(struct memblock_type *type)
@@ -42,23 +42,23 @@ static inline const char *memblock_type_name(struct memblock_type *type)
  * Address comparison utilities
  */
 
-static phys_addr_t memblock_align_down(phys_addr_t addr, phys_addr_t size)
+static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size)
 {
 	return addr & ~(size - 1);
 }
 
-static phys_addr_t memblock_align_up(phys_addr_t addr, phys_addr_t size)
+static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size)
 {
 	return (addr + (size - 1)) & ~(size - 1);
 }
 
-static unsigned long memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
+static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
 				       phys_addr_t base2, phys_addr_t size2)
 {
 	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
 }
 
-static long memblock_addrs_adjacent(phys_addr_t base1, phys_addr_t size1,
+static long __init_memblock memblock_addrs_adjacent(phys_addr_t base1, phys_addr_t size1,
 			       phys_addr_t base2, phys_addr_t size2)
 {
 	if (base2 == base1 + size1)
@@ -69,7 +69,7 @@ static long memblock_addrs_adjacent(phys_addr_t base1, phys_addr_t size1,
 	return 0;
 }
 
-static long memblock_regions_adjacent(struct memblock_type *type,
+static long __init_memblock memblock_regions_adjacent(struct memblock_type *type,
 				 unsigned long r1, unsigned long r2)
 {
 	phys_addr_t base1 = type->regions[r1].base;
@@ -80,7 +80,7 @@ static long memblock_regions_adjacent(struct memblock_type *type,
 	return memblock_addrs_adjacent(base1, size1, base2, size2);
 }
 
-long memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+long __init_memblock memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
 {
 	unsigned long i;
 
@@ -156,7 +156,7 @@ static phys_addr_t __init memblock_find_base(phys_addr_t size, phys_addr_t align
 	return MEMBLOCK_ERROR;
 }
 
-static void memblock_remove_region(struct memblock_type *type, unsigned long r)
+static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
 {
 	unsigned long i;
 
@@ -168,7 +168,7 @@ static void memblock_remove_region(struct memblock_type *type, unsigned long r)
 }
 
 /* Assumption: base addr of region 1 < base addr of region 2 */
-static void memblock_coalesce_regions(struct memblock_type *type,
+static void __init_memblock memblock_coalesce_regions(struct memblock_type *type,
 		unsigned long r1, unsigned long r2)
 {
 	type->regions[r1].size += type->regions[r2].size;
@@ -178,7 +178,7 @@ static void memblock_coalesce_regions(struct memblock_type *type,
 /* Defined below but needed now */
 static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);
 
-static int memblock_double_array(struct memblock_type *type)
+static int __init_memblock memblock_double_array(struct memblock_type *type)
 {
 	struct memblock_region *new_array, *old_array;
 	phys_addr_t old_size, new_size, addr;
@@ -249,13 +249,13 @@ static int memblock_double_array(struct memblock_type *type)
 	return 0;
 }
 
-extern int __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
+extern int __init_memblock __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
 					  phys_addr_t addr2, phys_addr_t size2)
 {
 	return 1;
 }
 
-static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+static long __init_memblock memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
 {
 	unsigned long coalesced = 0;
 	long adjacent, i;
@@ -342,13 +342,13 @@ static long memblock_add_region(struct memblock_type *type, phys_addr_t base, ph
 	return 0;
 }
 
-long memblock_add(phys_addr_t base, phys_addr_t size)
+long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
 {
 	return memblock_add_region(&memblock.memory, base, size);
 
 }
 
-static long __memblock_remove(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
+static long __init_memblock __memblock_remove(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
 {
 	phys_addr_t rgnbegin, rgnend;
 	phys_addr_t end = base + size;
@@ -396,7 +396,7 @@ static long __memblock_remove(struct memblock_type *type, phys_addr_t base, phys
 	return memblock_add_region(type, end, rgnend - end);
 }
 
-long memblock_remove(phys_addr_t base, phys_addr_t size)
+long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
 {
 	return __memblock_remove(&memblock.memory, base, size);
 }
@@ -562,7 +562,7 @@ phys_addr_t __init memblock_phys_mem_size(void)
 	return memblock.memory_size;
 }
 
-phys_addr_t memblock_end_of_DRAM(void)
+phys_addr_t __init_memblock memblock_end_of_DRAM(void)
 {
 	int idx = memblock.memory.cnt - 1;
 
@@ -623,7 +623,7 @@ int __init memblock_is_reserved(phys_addr_t addr)
 	return 0;
 }
 
-int memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
+int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
 {
 	return memblock_overlaps_region(&memblock.reserved, base, size);
 }
@@ -634,7 +634,7 @@ void __init memblock_set_current_limit(phys_addr_t limit)
 	memblock.current_limit = limit;
 }
 
-static void memblock_dump(struct memblock_type *region, char *name)
+static void __init_memblock memblock_dump(struct memblock_type *region, char *name)
 {
 	unsigned long long base, size;
 	int i;
@@ -650,7 +650,7 @@ static void memblock_dump(struct memblock_type *region, char *name)
 	}
 }
 
-void memblock_dump_all(void)
+void __init_memblock memblock_dump_all(void)
 {
 	if (!memblock_debug)
 		return;
@@ -716,7 +716,7 @@ static int __init early_memblock(char *p)
 }
 early_param("memblock", early_memblock);
 
-#ifdef CONFIG_DEBUG_FS
+#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK)
 
 static int memblock_debug_show(struct seq_file *m, void *private)
 {
-- 
1.6.4.2