[PATCH 18/33] lmb: Add ARCH_DISCARD_LMB to put lmb code to .init

[Yinghai Lu <yinghai@kernel.org>]

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

Arch code could define ARCH_DISCARD_LMB in asm/lmb.h, __init_lmb will become __init, __initdata_lmb will becom __initdata

x86 code will use that.

-v2: use ARCH_DISCARD_LMB according to Michael Ellerman

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 include/linux/lmb.h |    8 +++++++
 mm/lmb.c            |   54 ++++++++++++++++++++++++++++++--------------------
 2 files changed, 40 insertions(+), 22 deletions(-)

diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 3c8095f..f615626 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -106,6 +106,14 @@ u64 lmb_memory_size(u64 addr, u64 limit);
 
 #include <asm/lmb.h>
 
+#ifdef ARCH_DISCARD_LMB
+#define __init_lmb __init
+#define __initdata_lmb __initdata
+#else
+#define __init_lmb
+#define __initdata_lmb
+#endif
+
 #endif /* CONFIG_HAVE_LMB */
 
 #endif /* __KERNEL__ */
diff --git a/mm/lmb.c b/mm/lmb.c
index 0260258..d082210 100644
--- a/mm/lmb.c
+++ b/mm/lmb.c
@@ -21,11 +21,11 @@
 
 #define LMB_ALLOC_ANYWHERE	0
 
-struct lmb lmb;
-static struct lmb_property lmb_memory_region[MAX_LMB_REGIONS + 1];
-static struct lmb_property lmb_reserved_region[MAX_LMB_REGIONS + 1];
+struct lmb lmb __initdata_lmb;
+static struct lmb_property lmb_memory_region[MAX_LMB_REGIONS + 1] __initdata_lmb;
+static struct lmb_property lmb_reserved_region[MAX_LMB_REGIONS + 1] __initdata_lmb;
 
-static int lmb_debug;
+static int lmb_debug __initdata_lmb;
 
 static int __init early_lmb(char *p)
 {
@@ -35,7 +35,7 @@ static int __init early_lmb(char *p)
 }
 early_param("lmb", early_lmb);
 
-static void lmb_dump(struct lmb_region *region, char *name)
+static void __init_lmb lmb_dump(struct lmb_region *region, char *name)
 {
 	unsigned long long base, size;
 	int i;
@@ -51,7 +51,7 @@ static void lmb_dump(struct lmb_region *region, char *name)
 	}
 }
 
-void lmb_dump_all(void)
+void __init_lmb lmb_dump_all(void)
 {
 	if (!lmb_debug)
 		return;
@@ -64,13 +64,13 @@ void lmb_dump_all(void)
 	lmb_dump(&lmb.reserved, "reserved");
 }
 
-static unsigned long lmb_addrs_overlap(u64 base1, u64 size1, u64 base2,
+static unsigned long __init_lmb lmb_addrs_overlap(u64 base1, u64 size1, u64 base2,
 					u64 size2)
 {
 	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
 }
 
-static long lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
+static long __init_lmb lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
 {
 	if (base2 == base1 + size1)
 		return 1;
@@ -80,7 +80,7 @@ static long lmb_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2)
 	return 0;
 }
 
-static long lmb_regions_adjacent(struct lmb_region *rgn,
+static long __init_lmb lmb_regions_adjacent(struct lmb_region *rgn,
 		unsigned long r1, unsigned long r2)
 {
 	u64 base1 = rgn->region[r1].base;
@@ -91,7 +91,7 @@ static long lmb_regions_adjacent(struct lmb_region *rgn,
 	return lmb_addrs_adjacent(base1, size1, base2, size2);
 }
 
-static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
+static void __init_lmb lmb_remove_region(struct lmb_region *rgn, unsigned long r)
 {
 	unsigned long i;
 
@@ -103,7 +103,7 @@ static void lmb_remove_region(struct lmb_region *rgn, unsigned long r)
 }
 
 /* Assumption: base addr of region 1 < base addr of region 2 */
-static void lmb_coalesce_regions(struct lmb_region *rgn,
+static void __init_lmb lmb_coalesce_regions(struct lmb_region *rgn,
 		unsigned long r1, unsigned long r2)
 {
 	rgn->region[r1].size += rgn->region[r2].size;
@@ -140,7 +140,7 @@ void __init lmb_analyze(void)
 		lmb.memory.size += lmb.memory.region[i].size;
 }
 
-static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
+static long __init_lmb lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 {
 	unsigned long coalesced = 0;
 	long adjacent, i;
@@ -204,7 +204,7 @@ static long lmb_add_region(struct lmb_region *rgn, u64 base, u64 size)
 	return 0;
 }
 
-long lmb_add(u64 base, u64 size)
+long __init_lmb lmb_add(u64 base, u64 size)
 {
 	struct lmb_region *_rgn = &lmb.memory;
 
@@ -216,7 +216,7 @@ long lmb_add(u64 base, u64 size)
 
 }
 
-static long __lmb_remove(struct lmb_region *rgn, u64 base, u64 size)
+static long __init_lmb __lmb_remove(struct lmb_region *rgn, u64 base, u64 size)
 {
 	u64 rgnbegin, rgnend;
 	u64 end = base + size;
@@ -264,7 +264,7 @@ static long __lmb_remove(struct lmb_region *rgn, u64 base, u64 size)
 	return lmb_add_region(rgn, end, rgnend - end);
 }
 
-long lmb_remove(u64 base, u64 size)
+long __init_lmb lmb_remove(u64 base, u64 size)
 {
 	return __lmb_remove(&lmb.memory, base, size);
 }
@@ -283,7 +283,7 @@ long __init lmb_reserve(u64 base, u64 size)
 	return lmb_add_region(_rgn, base, size);
 }
 
-long lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
+long __init_lmb lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
 {
 	unsigned long i;
 
@@ -297,12 +297,12 @@ long lmb_overlaps_region(struct lmb_region *rgn, u64 base, u64 size)
 	return (i < rgn->cnt) ? i : -1;
 }
 
-static u64 lmb_align_down(u64 addr, u64 size)
+static u64 __init_lmb lmb_align_down(u64 addr, u64 size)
 {
 	return addr & ~(size - 1);
 }
 
-static u64 lmb_align_up(u64 addr, u64 size)
+static u64 __init_lmb lmb_align_up(u64 addr, u64 size)
 {
 	return (addr + (size - 1)) & ~(size - 1);
 }
@@ -462,7 +462,7 @@ u64 __init lmb_phys_mem_size(void)
 	return lmb.memory.size;
 }
 
-u64 lmb_end_of_DRAM(void)
+u64 __init_lmb lmb_end_of_DRAM(void)
 {
 	int idx = lmb.memory.cnt - 1;
 
@@ -526,7 +526,7 @@ int __init lmb_is_reserved(u64 addr)
 	return 0;
 }
 
-int lmb_is_region_reserved(u64 base, u64 size)
+int __init_lmb lmb_is_region_reserved(u64 base, u64 size)
 {
 	return lmb_overlaps_region(&lmb.reserved, base, size);
 }
@@ -535,7 +535,7 @@ int lmb_is_region_reserved(u64 base, u64 size)
  * Given a <base, len>, find which memory regions belong to this range.
  * Adjust the request and return a contiguous chunk.
  */
-int lmb_find(struct lmb_property *res)
+int __init_lmb lmb_find(struct lmb_property *res)
 {
 	int i;
 	u64 rstart, rend;
@@ -689,10 +689,11 @@ static void __init subtract_lmb_reserved(struct range *range, int az)
 	int i, count;
 	u64 final_start, final_end;
 
+#ifdef ARCH_DISCARD_LMB
 	/* Take out region array itself at first*/
 	if (lmb.reserved.region != lmb_reserved_region)
 		lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
-
+#endif
 	count  = lmb.reserved.cnt;
 
 	if (lmb_debug)
@@ -708,9 +709,11 @@ static void __init subtract_lmb_reserved(struct range *range, int az)
 			continue;
 		subtract_range(range, az, final_start, final_end);
 	}
+#ifdef ARCH_DISCARD_LMB
 	/* Put region array back ? */
 	if (lmb.reserved.region != lmb_reserved_region)
 		lmb_reserve(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
+#endif
 }
 
 int __init get_free_all_memory_range(struct range **rangep, int nodeid)
@@ -735,6 +738,7 @@ int __init get_free_all_memory_range(struct range **rangep, int nodeid)
 	subtract_lmb_reserved(range, count);
 	nr_range = clean_sort_range(range, count);
 
+#ifdef ARCH_DISCARD_LMB
 	/* Need to clear it ? */
 	if (nodeid == MAX_NUMNODES) {
 		memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
@@ -742,6 +746,7 @@ int __init get_free_all_memory_range(struct range **rangep, int nodeid)
 		lmb.reserved.nr_regions = 0;
 		lmb.reserved.cnt = 0;
 	}
+#endif
 
 	*rangep = range;
 	return nr_range;
@@ -752,9 +757,11 @@ void __init lmb_to_bootmem(u64 start, u64 end)
 	int i, count;
 	u64 final_start, final_end;
 
+#ifdef ARCH_DISCARD_LMB
 	/* Take out region array itself */
 	if (lmb.reserved.region != lmb_reserved_region)
 		lmb_free(__pa(lmb.reserved.region), sizeof(struct lmb_property) * lmb.reserved.nr_regions);
+#endif
 
 	count  = lmb.reserved.cnt;
 	if (lmb_debug)
@@ -774,11 +781,14 @@ void __init lmb_to_bootmem(u64 start, u64 end)
 			pr_cont(" ==> [%010llx - %010llx]\n", final_start, final_end);
 		reserve_bootmem_generic(final_start, final_end - final_start, BOOTMEM_DEFAULT);
 	}
+
+#ifdef ARCH_DISCARD_LMB
 	/* Clear them to avoid misusing ? */
 	memset(&lmb.reserved.region[0], 0, sizeof(struct lmb_property) * lmb.reserved.nr_regions);
 	lmb.reserved.region = NULL;
 	lmb.reserved.nr_regions = 0;
 	lmb.reserved.cnt = 0;
+#endif
 }
 #endif
 
-- 
1.6.4.2