[PATCH 07/25] lmb: Add lmb_find_in_range()

[Yinghai Lu <yinghai@kernel.org>]

it is a wrapper for lmb_find_base

make it more easy for x86 to use lmb. ( rebase )
x86 early_res is using find/reserve pattern instead of alloc.

keep it in weak version, so later We can use x86 own version if needed.
also We need it in lib/lmb.c, so one caller mm/page_alloc.c could get compiled

-v2: Change name to lmb_find_in_range() according to Michael Ellerman
-v3: Add generic weak version __lmb_find_in_range()
     so keep the path for fallback to x86 version that handle from low
-v4: use 0 for failing path
-v5: use LMB_ERROR again
-v6: remove __lmb_find_in_range()

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 include/linux/lmb.h |    2 ++
 lib/lmb.c           |    8 ++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/lmb.h b/include/linux/lmb.h
index 5310c7b..6ca5659 100644
--- a/include/linux/lmb.h
+++ b/include/linux/lmb.h
@@ -45,6 +45,8 @@ extern int lmb_debug;
 extern int lmb_can_resize;
 extern struct lmb_region lmb_reserved_init_regions[];
 
+u64 lmb_find_in_range(u64 start, u64 end, u64 size, u64 align);
+
 extern void __init lmb_init(void);
 extern void __init lmb_analyze(void);
 extern long lmb_add(phys_addr_t base, phys_addr_t size);
diff --git a/lib/lmb.c b/lib/lmb.c
index e45e967..2e00159 100644
--- a/lib/lmb.c
+++ b/lib/lmb.c
@@ -156,6 +156,14 @@ static phys_addr_t __init lmb_find_base(phys_addr_t size, phys_addr_t align,
 	return LMB_ERROR;
 }
 
+/*
+ * Find a free area with specified alignment in a specific range.
+ */
+u64 __init __weak lmb_find_in_range(u64 start, u64 end, u64 size, u64 align)
+{
+	return lmb_find_base(size, align, start, end);
+}
+
 static void __init_lmb lmb_remove_region(struct lmb_type *type, unsigned long r)
 {
 	unsigned long i;
-- 
1.6.4.2