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By default, the 8xx pins an ITLB on the first 8M of memory in order to avoid any ITLB miss on kernel code. However, with some debug functions like DEBUG_PAGEALLOC and DEBUG_RODATA, pinning TLBs is contradictory. In order to avoid any ITLB miss in a critical section without pinning TLBs, we have to ensure that there is no page boundary crossed between the setup of a new value in SRR0/SRR1 and the associated RFI. The functions modifying srr0/srr1 are all located in setup_32.S. They are spread over almost 4kbytes. The patch forces a 12 bits (4kbytes) alignment for those functions. This garanties that the functions remain in a single 4k page. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.