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Linux kernel source tree
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Don't assume the receive buffer size is a power-of-2 number of pages. Instead, define the receive buffer size independently, and then compute the page order from that size when needed. This fixes a build problem that arises when the ARM64_PAGE_SHIFT config option is set to have a page size greater than 4KB. The problem was identified by Linux Kernel Functional Testing. The IPA code basically assumed the page size to be 4KB. A larger page size caused the receive buffer size to become correspondingly larger (32KB or 128KB for ARM64_16K_PAGES and ARM64_64K_PAGES, respectively). The receive buffer size is used to compute an "aggregation byte limit" value that gets programmed into the hardware, and the large page sizes caused that limit value to be too big to fit in a 5 bit field. This triggered a BUILD_BUG_ON() call in ipa_endpoint_validate_build(). This fix causes a lot of receive buffer memory to be wasted if system is configured for page size greater than 4KB. But such a misguided configuration will now build successfully. Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Alex Elder <elder@linaro.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| 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.
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.