Re: Phyr Starter
On Thu, Jan 20, 2022 at 02:56:02PM +0100, Christoph Hellwig wrote: > - on the input side to dma mapping the bio_vecs (or phyrs) are chained >as bios or whatever the containing structure is. These already exist >and have infrastructure at least in the block layer > - on the output side I plan for two options: > > 1) we have a sane IOMMU and everyting will be coalesced into a > single dma_range. This requires setting the block layer > merge boundary to match the IOMMU page size, but that is > a very good thing to do anyway. It doesn't look like IOMMU page sizes are exported, or even necessarily consistently sized on at least one arch (power).
Re: [trivial PATCH] treewide: Convert switch/case fallthrough; to break;
On Wed, Sep 09, 2020 at 01:06:39PM -0700, Joe Perches wrote:
> diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
> index eea0f453cfb6..8aac5bc60f4c 100644
> --- a/crypto/tcrypt.c
> +++ b/crypto/tcrypt.c
> @@ -2464,7 +2464,7 @@ static int do_test(const char *alg, u32 type, u32 mask,
> int m, u32 num_mb)
> test_hash_speed("streebog512", sec,
> generic_hash_speed_template);
> if (mode > 300 && mode < 400) break;
> - fallthrough;
> + break;
> case 399:
> break;
Just imho, this change makes the preceding 'if' look even more
pointless. Maybe the fallthrough was a deliberate choice? Not that my
opinion matters here as I don't know this module, but it looked a bit
odd to me.
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Re: [PATCH 26/34] mm/gup_benchmark.c: convert put_page() to put_user_page*()
On Thu, Aug 01, 2019 at 07:19:57PM -0700, john.hubb...@gmail.com wrote:
> From: John Hubbard
>
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
>
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
>
> Cc: Dan Carpenter
> Cc: Greg Kroah-Hartman
> Cc: Keith Busch
> Cc: Kirill A. Shutemov
> Cc: Michael S. Tsirkin
> Cc: YueHaibing
> Signed-off-by: John Hubbard
Looks fine.
Reviewed-by: Keith Busch
> mm/gup_benchmark.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
> index 7dd602d7f8db..515ac8eeb6ee 100644
> --- a/mm/gup_benchmark.c
> +++ b/mm/gup_benchmark.c
> @@ -79,7 +79,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
> for (i = 0; i < nr_pages; i++) {
> if (!pages[i])
> break;
> - put_page(pages[i]);
> + put_user_page(pages[i]);
> }
> end_time = ktime_get();
> gup->put_delta_usec = ktime_us_delta(end_time, start_time);
> --
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