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Date: Fri, 3 Oct 2014 14:26:53 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Al Cooper <alcooperx@...il.com>, Grant Likely <grant.likely@...aro.org> Subject: [PATCH 3.16 027/357] of: Allow mem_reserve of memory with a base address of zero 3.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Al Cooper <alcooperx@...il.com> 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@...il.com> Signed-off-by: Grant Likely <grant.likely@...aro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- 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); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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