mainlining shenanigans
8f3c39b856
Currently, the udlfb driver only tests for identical bytes at the beginning or at the end of a page and renders anything between the first and last mismatching pixel. But pages are not the same as lines, so this is quite suboptimal - if there is something modified at the beginning of a page and at the end of a page, the whole page is rendered, even if most of the page is not modified. This patch makes it test for identical pixels at the beginning and end of each rendering command. This patch improves identical byte detection by 41% when playing video in a window. This patch also fixes a possible screen corruption if the user is writing to the framebuffer while dlfb_render_hline is in progress - the pixel data that is copied to the backbuffer with memcpy may be different from the pixel data that is actually rendered to the hardware (because the content of the framebuffer may change between memcpy and the rendering command). We must make sure that we copy exactly the same pixel as the pixel that is being rendered. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> [b.zolnierkie: fix code indent] Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.