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MIPS: CMA: Do not reserve memory if not required

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Even if CMA is disabled, the for_each_memblock macro expands
to run reserve_bootmem once. Hence, reserve_bootmem attempts to
reserve location 0 of size 0.

Add a check to avoid that.

Issue was highlighted during testing with EVA enabled.
resrve_bootmem used to exit gracefully when passed arguments to
reserve 0 size location at 0 without EVA.

But with EVA enabled, macros would point to different addresses
and the code would trigger a BUG.

Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com>
Tested-by: Markos Chandras <markos.chandras@imgtec.com>
Tested-by: Huacai Chen <chenhc@lemote.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8231/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Zubair Lutfullah Kakakhel 2014-10-28 11:28:34 +00:00 committed by Ralf Baechle
parent 5df4c8dbbc
commit 30fa0530ff
1 changed files with 2 additions and 1 deletions
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3
arch/mips/kernel/setup.c
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@ -683,7 +683,8 @@ static void __init arch_mem_init(char **cmdline_p)
dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
/* Tell bootmem about cma reserved memblock section */
for_each_memblock(reserved, reg)
reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
if (reg->size != 0)
reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
}
static void __init resource_init(void)