[PATCH 4.2.y-ckt 071/218] of: alloc anywhere from memblock if range not specified

From: Kamal Mostafa
Date: Thu Mar 31 2016 - 17:08:18 EST

4.2.8-ckt7 -stable review patch. If anyone has any objections, please let me know.


From: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>

commit e53b50c0cbe392c946807abf7d07615a3c588642 upstream.

early_init_dt_alloc_reserved_memory_arch passes end as 0 to
__memblock_alloc_base, when limits are not specified. But
__memblock_alloc_base takes end value of 0 as MEMBLOCK_ALLOC_ACCESSIBLE
and limits the end to memblock.current_limit. This results in regions
never being placed in HIGHMEM area, for e.g. CMA.
Let __memblock_alloc_base allocate from anywhere in memory if limits are
not specified.

Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/of/of_reserved_mem.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 56c23ee..be4f65c 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -31,11 +31,13 @@ int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
phys_addr_t *res_base)
+ phys_addr_t base;
* We use __memblock_alloc_base() because memblock_alloc_base()
* panic()s on allocation failure.
- phys_addr_t base = __memblock_alloc_base(size, align, end);
+ end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
+ base = __memblock_alloc_base(size, align, end);
if (!base)
return -ENOMEM;