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58b0afa038
Instead of having separate calls to 'inode_permission()' depending on whether we're in RCU lookup or not, just share the first call. Note that the initial "conditional" on LOOKUP_RCU really turns into just a "convert the LOOKUP_RCU bit in the nameidata into the MAY_NOT_BLOCK bit in the argument", which is just a trivial bitwise and and shift operation. So the initial conditional goes away entirely, and then the likely case is that it will succeed independently of us being in RCU lookup or not, and the possible "we may need to fall out of RCU and redo it all" fixups that are needed afterwards all go in the unlikely path. [ This also marks 'nd' restrict, because that means that the compiler can know that there is no other alias, and can cache the LOOKUP_RCU value over the call to inode_permission(). ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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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 reStructuredText 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.