On 1/17/2013 4:17 PM, Russell King - ARM Linux wrote:
On Thu, Jan 17, 2013 at 10:37:42AM +, Russell King - ARM Linux wrote:
On Thu, Jan 17, 2013 at 09:11:20AM +, James Bottomley wrote:
I'd actually prefer page = pfn_to_page(page_to_pfn(page) + 1); because
it makes the code look like the
On Thu, Jan 17, 2013 at 11:19:21AM +, James Bottomley wrote:
> On Thu, 2013-01-17 at 11:04 +, Russell King - ARM Linux wrote:
> > On Thu, Jan 17, 2013 at 11:01:47AM +, James Bottomley wrote:
> > > On Thu, 2013-01-17 at 10:47 +, Russell King - ARM Linux wrote:
> > > > Also, couldn't
On Thu, 2013-01-17 at 11:04 +, Russell King - ARM Linux wrote:
> On Thu, Jan 17, 2013 at 11:01:47AM +, James Bottomley wrote:
> > On Thu, 2013-01-17 at 10:47 +, Russell King - ARM Linux wrote:
> > > Also, couldn't the addition of the scatterlist offset to the page also
> > > be buggy to
On Thu, Jan 17, 2013 at 11:01:47AM +, James Bottomley wrote:
> On Thu, 2013-01-17 at 10:47 +, Russell King - ARM Linux wrote:
> > Also, couldn't the addition of the scatterlist offset to the page also
> > be buggy too?
>
> No, fortunately, offset must be within the first page from the poin
On Thu, 2013-01-17 at 10:47 +, Russell King - ARM Linux wrote:
> On Thu, Jan 17, 2013 at 10:37:42AM +, Russell King - ARM Linux wrote:
> > On Thu, Jan 17, 2013 at 09:11:20AM +, James Bottomley wrote:
> > > I'd actually prefer page = pfn_to_page(page_to_pfn(page) + 1); because
> > > it m
On Thu, Jan 17, 2013 at 10:37:42AM +, Russell King - ARM Linux wrote:
> On Thu, Jan 17, 2013 at 09:11:20AM +, James Bottomley wrote:
> > I'd actually prefer page = pfn_to_page(page_to_pfn(page) + 1); because
> > it makes the code look like the hack it is. The preferred form for all
> > ite
On Thu, Jan 17, 2013 at 09:11:20AM +, James Bottomley wrote:
> On Wed, 2013-01-16 at 15:18 -0800, Tejun Heo wrote:
> > On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> > > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> > > index 6b2fb87..ab88c5b 100644
>
On Wed, 2013-01-16 at 15:18 -0800, Tejun Heo wrote:
> On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> > diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> > index 6b2fb87..ab88c5b 100644
> > --- a/arch/arm/mm/dma-mapping.c
> > +++ b/arch/arm/mm/dma-mapping.c
> >
On Wed, 2013-01-16 at 23:14 +, Russell King - ARM Linux wrote:
> On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> > On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
> >
> > > Now consider this call stack from MMC block driver (this is on the ARmv7
> > > based board
On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index 6b2fb87..ab88c5b 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -809,7 +809,7 @@ static void dma_cache_maint_page(struct pag
On Wed, Jan 16, 2013 at 10:32:35AM +, James Bottomley wrote:
> On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
>
> > Now consider this call stack from MMC block driver (this is on the ARmv7
> > based board):
> > [ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
> > [] (dma_
On 1/16/2013 4:02 PM, James Bottomley wrote:
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
Now consider this call stack from MMC block driver (this is on the ARmv7
based board):
[ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
[] (dma_cache_maint_page+0x1c4/0x24c)
[
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
> Now consider this call stack from MMC block driver (this is on the ARmv7
> based board):
> [ 98.918174] [] (v7_dma_inv_range+0x30/0x48) from
> [] (dma_cache_maint_page+0x1c4/0x24c)
> [ 98.927819] [] (dma_cache_maint_page+
On Wed, 2013-01-16 at 12:07 +0530, Subhash Jadavani wrote:
> On 1/15/2013 9:49 PM, James Bottomley wrote:
> > On Tue, 2013-01-15 at 21:31 +0530, Subhash Jadavani wrote:
> >> blk_rq_map_sg() function merges the physically contiguous pages to use same
> >> scatter-gather node without checking if thei
On 1/15/2013 9:49 PM, James Bottomley wrote:
On Tue, 2013-01-15 at 21:31 +0530, Subhash Jadavani wrote:
blk_rq_map_sg() function merges the physically contiguous pages to use same
scatter-gather node without checking if their page descriptors are
contiguous or not.
Now when dma_map_sg() is call
On Tue, 2013-01-15 at 21:31 +0530, Subhash Jadavani wrote:
> blk_rq_map_sg() function merges the physically contiguous pages to use same
> scatter-gather node without checking if their page descriptors are
> contiguous or not.
>
> Now when dma_map_sg() is called on the scatter gather list, it woul
blk_rq_map_sg() function merges the physically contiguous pages to use same
scatter-gather node without checking if their page descriptors are
contiguous or not.
Now when dma_map_sg() is called on the scatter gather list, it would
take the base page pointer from each node (one by one) and iterates
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