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c0aac3a51c
Most platforms do not need to do synci instruction operations when synci_step is 0. But for example, the synci implementation on Loongson64 platform has some changes. On the one hand, it ensures that the memory access instructions have been completed. On the other hand, it guarantees that all prefetch instructions need to be fetched again. And its address information is useless. Thus, only one synci operation is required when synci_step is 0 on Loongson64 platform. I guess that some other platforms have similar implementations on synci, so add judgment conditions in `while` to ensure that at least all platforms perform synci operations once. For those platforms that do not need synci, they just do one more operation similar to nop. Signed-off-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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.