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Subject[PATCH 20/39] lmb: Add ARCH_DISCARD_LMB to put lmb code to .init
Date
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 dfbf660..ab3d85f 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


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