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1. Disable local irq before d-cache write-back and invalidate. The cpu_dcache_wbinval_page function is composed of d-cache write-back and invalidate. If the local irq is enabled when calling cpu_dcache_wbinval_page, the content of d-cache is possibly updated between write-back and invalidate. In this case, the updated data will be dropped due to the following d-cache invalidation. Therefore, we disable the local irq before calling cpu_dcache_wbinval_page. 2. Correct the data write-back for page aliasing case. Only the page whose (page->index << PAGE_SHIFT) is located at the same page color as page_address(page) needs to execute data write-back in flush_dcache_page function. Signed-off-by: Vincent Chen <vincentc@andestech.com> Reviewed-by: Greentime Hu <greentime@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com>
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.