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Date: Sat, 5 Dec 2015 01:20:56 +0600
From: Alexander Kuleshov <kuleshovmail@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Tony Luck <tony.luck@...el.com>,
Tang Chen <tangchen@...fujitsu.com>,
Pekka Enberg <penberg@...nel.org>,
Wei Yang <weiyang@...ux.vnet.ibm.com>,
Robin Holt <holt@....com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH] mm/memblock: introduce for_each_memblock_type()
We already have the for_each_memblock() macrom in the <linux/memblock.h>
which provides ability to iterate over memblock regions of a known type.
The for_each_memblock() macro does allow us to pass the pointer to the
struct memblock_type, instead we need to pass name of the type.
This patch introduces new macro - for_each_memblock_type() which allows
us iterate over memblock regions with the given type when the type is
unknown.
Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
include/linux/memblock.h | 5 +++++
mm/memblock.c | 32 ++++++++++++++++----------------
2 files changed, 21 insertions(+), 16 deletions(-)
diff --git a/include/linux/memblock.h b/include/linux/memblock.h
index 24daf8f..b7bb796 100644
--- a/include/linux/memblock.h
+++ b/include/linux/memblock.h
@@ -391,6 +391,11 @@ static inline unsigned long memblock_region_reserved_end_pfn(const struct memblo
region < (memblock.memblock_type.regions + memblock.memblock_type.cnt); \
region++)
+#define for_each_memblock_type(memblock_type, rgn) \
+ idx = 0; \
+ rgn = &memblock_type->regions[idx]; \
+ for (idx = 0; idx < memblock_type->cnt; \
+ idx++,rgn = &memblock_type->regions[idx])
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
#define __init_memblock __meminit
diff --git a/mm/memblock.c b/mm/memblock.c
index d300f13..bf8b8ac 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -528,7 +528,8 @@ int __init_memblock memblock_add_range(struct memblock_type *type,
bool insert = false;
phys_addr_t obase = base;
phys_addr_t end = base + memblock_cap_size(base, &size);
- int i, nr_new;
+ int idx, nr_new;
+ struct memblock_region *rgn;
if (!size)
return 0;
@@ -552,8 +553,7 @@ repeat:
base = obase;
nr_new = 0;
- for (i = 0; i < type->cnt; i++) {
- struct memblock_region *rgn = &type->regions[i];
+ for_each_memblock_type(type, rgn) {
phys_addr_t rbase = rgn->base;
phys_addr_t rend = rbase + rgn->size;
@@ -572,7 +572,7 @@ repeat:
WARN_ON(flags != rgn->flags);
nr_new++;
if (insert)
- memblock_insert_region(type, i++, base,
+ memblock_insert_region(type, idx++, base,
rbase - base, nid,
flags);
}
@@ -584,7 +584,7 @@ repeat:
if (base < end) {
nr_new++;
if (insert)
- memblock_insert_region(type, i, base, end - base,
+ memblock_insert_region(type, idx, base, end - base,
nid, flags);
}
@@ -651,7 +651,8 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
int *start_rgn, int *end_rgn)
{
phys_addr_t end = base + memblock_cap_size(base, &size);
- int i;
+ int idx;
+ struct memblock_region *rgn;
*start_rgn = *end_rgn = 0;
@@ -663,8 +664,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
if (memblock_double_array(type, base, size) < 0)
return -ENOMEM;
- for (i = 0; i < type->cnt; i++) {
- struct memblock_region *rgn = &type->regions[i];
+ for_each_memblock_type(type, rgn) {
phys_addr_t rbase = rgn->base;
phys_addr_t rend = rbase + rgn->size;
@@ -681,7 +681,7 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
rgn->base = base;
rgn->size -= base - rbase;
type->total_size -= base - rbase;
- memblock_insert_region(type, i, rbase, base - rbase,
+ memblock_insert_region(type, idx, rbase, base - rbase,
memblock_get_region_node(rgn),
rgn->flags);
} else if (rend > end) {
@@ -692,14 +692,14 @@ static int __init_memblock memblock_isolate_range(struct memblock_type *type,
rgn->base = end;
rgn->size -= end - rbase;
type->total_size -= end - rbase;
- memblock_insert_region(type, i--, rbase, end - rbase,
+ memblock_insert_region(type, idx--, rbase, end - rbase,
memblock_get_region_node(rgn),
rgn->flags);
} else {
/* @rgn is fully contained, record it */
if (!*end_rgn)
- *start_rgn = i;
- *end_rgn = i + 1;
+ *start_rgn = idx;
+ *end_rgn = idx + 1;
}
}
@@ -1613,12 +1613,12 @@ static void __init_memblock memblock_dump(struct memblock_type *type, char *name
{
unsigned long long base, size;
unsigned long flags;
- int i;
+ int idx;
+ struct memblock_region *rgn;
pr_info(" %s.cnt = 0x%lx\n", name, type->cnt);
- for (i = 0; i < type->cnt; i++) {
- struct memblock_region *rgn = &type->regions[i];
+ for_each_memblock_type(type, rgn) {
char nid_buf[32] = "";
base = rgn->base;
@@ -1630,7 +1630,7 @@ static void __init_memblock memblock_dump(struct memblock_type *type, char *name
memblock_get_region_node(rgn));
#endif
pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes%s flags: %#lx\n",
- name, i, base, base + size - 1, size, nid_buf, flags);
+ name, idx, base, base + size - 1, size, nid_buf, flags);
}
}
--
2.5.0
--
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