This is a note to let you know that I've just added the patch titled
of: Allow mem_reserve of memory with a base address of zero
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
of-allow-mem_reserve-of-memory-with-a-base-address-of-zero.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b5f2a8c02697c3685ccbbb66495465742ffa0dc1 Mon Sep 17 00:00:00 2001
From: Al Cooper <alcooperx@xxxxxxxxx>
Date: Wed, 6 Aug 2014 16:30:04 -0400
Subject: of: Allow mem_reserve of memory with a base address of zero
From: Al Cooper <alcooperx@xxxxxxxxx>
commit b5f2a8c02697c3685ccbbb66495465742ffa0dc1 upstream.
__reserved_mem_reserve_reg() won't reserve memory if the base address
is zero. This change removes the check for a base address of zero and
allows it to be reserved.
Allowing the first 4K of memory to be reserved will help solve a
problem on some ARM systems where the the first 16K of memory is
unused and becomes allocable memory. This will prevent this memory
from being used for DMA by drivers like the USB OHCI driver which
consider a physical address of zero to be illegal.
Signed-off-by: Al Cooper <alcooperx@xxxxxxxxx>
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/of/fdt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -453,7 +453,7 @@ static int __init __reserved_mem_reserve
base = dt_mem_next_cell(dt_root_addr_cells, &prop);
size = dt_mem_next_cell(dt_root_size_cells, &prop);
- if (base && size &&
+ if (size &&
early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n",
uname, &base, (unsigned long)size / SZ_1M);
Patches currently in stable-queue which might be from alcooperx@xxxxxxxxx are
queue-3.16/of-allow-mem_reserve-of-memory-with-a-base-address-of-zero.patch
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