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Groups > linux.kernel > #1645026
| From | Mauro Carvalho Chehab <mchehab@s-opensource.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 16/31] DMA-attributes.txt: standardize document format |
| Date | 2017-05-19 03:30 +0200 |
| Message-ID | <tIETV-39a-51@gated-at.bofh.it> (permalink) |
| References | <tIETT-39a-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Each text file under Documentation follows a different format. Some doesn't even have titles! Change its representation to follow the adopted standard, using ReST markups for it to be parseable by Sphinx: This file is almost on the standard format. All it needs to be parsed by Sphinx is to fix its main title and add a few blank lines. Yet, it is worth to replace NOTE: by the corresponding ReST markup. While here, remove the extra "---" from a subtitle. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> --- Documentation/DMA-attributes.txt | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/Documentation/DMA-attributes.txt b/Documentation/DMA-attributes.txt index 44c6bc496eee..8f8d97f65d73 100644 --- a/Documentation/DMA-attributes.txt +++ b/Documentation/DMA-attributes.txt @@ -1,5 +1,6 @@ - DMA attributes - ============== +============== +DMA attributes +============== This document describes the semantics of the DMA attributes that are defined in linux/dma-mapping.h. @@ -108,6 +109,7 @@ This is a hint to the DMA-mapping subsystem that it's probably not worth the time to try to allocate memory to in a way that gives better TLB efficiency (AKA it's not worth trying to build the mapping out of larger pages). You might want to specify this if: + - You know that the accesses to this memory won't thrash the TLB. You might know that the accesses are likely to be sequential or that they aren't sequential but it's unlikely you'll ping-pong @@ -121,11 +123,12 @@ pages). You might want to specify this if: the mapping to have a short lifetime then it may be worth it to optimize allocation (avoid coming up with large pages) instead of getting the slight performance win of larger pages. + Setting this hint doesn't guarantee that you won't get huge pages, but it means that we won't try quite as hard to get them. -NOTE: At the moment DMA_ATTR_ALLOC_SINGLE_PAGES is only implemented on ARM, -though ARM64 patches will likely be posted soon. +.. note:: At the moment DMA_ATTR_ALLOC_SINGLE_PAGES is only implemented on ARM, + though ARM64 patches will likely be posted soon. DMA_ATTR_NO_WARN ---------------- @@ -142,10 +145,10 @@ problem at all, depending on the implementation of the retry mechanism. So, this provides a way for drivers to avoid those error messages on calls where allocation failures are not a problem, and shouldn't bother the logs. -NOTE: At the moment DMA_ATTR_NO_WARN is only implemented on PowerPC. +.. note:: At the moment DMA_ATTR_NO_WARN is only implemented on PowerPC. DMA_ATTR_PRIVILEGED ------------------------------- +------------------- Some advanced peripherals such as remote processors and GPUs perform accesses to DMA buffers in both privileged "supervisor" and unprivileged -- 2.9.4
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[PATCH 00/31] Standardize doc formats - part 1 Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:30 +0200
[PATCH 16/31] DMA-attributes.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:30 +0200
[PATCH 27/31] intel_txt.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:30 +0200
[PATCH 26/31] hwspinlock.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:30 +0200
[PATCH 13/31] digsig.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:30 +0200
[PATCH 19/31] efi-stub.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 28/31] Intel-IOMMU.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 06/31] cgroup-v2.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
Re: [PATCH 06/31] cgroup-v2.txt: standardize document format Tejun Heo <tj@kernel.org> - 2017-05-19 17:00 +0200
[PATCH 03/31] btmrvl.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 22/31] futex-requeue-pi.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 08/31] clk.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 07/31] circular-buffers.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 12/31] dcdbas.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 25/31] hw_random.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 21/31] flexible-arrays.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 01/31] bcache.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 04/31] bus-virt-phys-mapping.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 23/31] gcc-plugins.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
Re: [PATCH 23/31] gcc-plugins.txt: standardize document format Kees Cook <keescook@google.com> - 2017-05-24 19:40 +0200
Re: [PATCH 23/31] gcc-plugins.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-24 22:20 +0200
[PATCH 09/31] cpu-load: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 24/31] highuid.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 17/31] DMA-ISA-LPC.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 18/31] debugging-via-ohci1394.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 05/31] cachetlb.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 10/31] cputopology.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 02/31] bt8xxgpio.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 15/31] DMA-API-HOWTO.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 11/31] crc32.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 20/31] eisa.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
[PATCH 14/31] DMA-API.txt: standardize document format Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-05-19 03:50 +0200
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