On Thu, May 22 2014, Gioh Kim <gioh.kim@xxxxxxx> wrote:
> I appreciate your comments.
> The previous patch was ugly. But now it's beautiful! Just 3 lines!
>
> I'm not familiar with kernel patch process.
> Can I have your name at Signed-off-by: line?
> What tag do I have to write your name in?
My Signed-off-by line does not apply in this case.
Documentation/SubmittingPatches describes what Signed-off-by means.
I've added Acked-by below. You may want to resend this patch using
“git-send-email”.
> --------------------------------- 8< ----------------------------------------------
> From 135c986cfaa5a7291519308b3d47e58bf9f5af25 Mon Sep 17 00:00:00 2001
> From: Gioh Kim <gioh.kim@xxxxxxx>
> Date: Tue, 20 May 2014 14:16:20 +0900
> Subject: [PATCH] arm: dma-mapping: add checking cma area initialized
>
> If CMA is turned on and CMA size is set to zero, kernel should
> behave as if CMA was not enabled at compile time.
> Every dma allocation should check existence of cma area
> before requesting memory.
>
> Signed-off-by: Gioh Kim <gioh.kim@xxxxxxx>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Acked-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
But like before, if someone with more ARM knowledge could take a look at
it, it would be awesome.
> ---
> arch/arm/mm/dma-mapping.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 18e98df..9173a13 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -390,12 +390,13 @@ static int __init atomic_pool_init(void)
> if (!pages)
> goto no_pages;
>
> - if (IS_ENABLED(CONFIG_DMA_CMA))
> + if (dev_get_cma_area(NULL))
> ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page,
> atomic_pool_init);
> else
> ptr = __alloc_remap_buffer(NULL, pool->size, gfp, prot, &page,
> atomic_pool_init);
> +
> if (ptr) {
> int i;
>
> @@ -701,7 +702,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
> addr = __alloc_simple_buffer(dev, size, gfp, &page);
> else if (!(gfp & __GFP_WAIT))
> addr = __alloc_from_pool(size, &page);
> - else if (!IS_ENABLED(CONFIG_DMA_CMA))
> + else if (!dev_get_cma_area(dev))
> addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);
> else
> addr = __alloc_from_contiguous(dev, size, prot, &page, caller);
> @@ -790,7 +791,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
> __dma_free_buffer(page, size);
> } else if (__free_from_pool(cpu_addr, size)) {
> return;
> - } else if (!IS_ENABLED(CONFIG_DMA_CMA)) {
> + } else if (!dev_get_cma_area(dev)) {
> __dma_free_remap(cpu_addr, size);
> __dma_free_buffer(page, size);
> } else {
> --
> 1.7.9.5
--
Best regards, _ _
.o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
..o | Computer Science, Michał “mina86” Nazarewicz (o o)
ooo +--<mpn@xxxxxxxxxx>--<xmpp:mina86@xxxxxxxxxx>--ooO--(_)--Ooo--
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