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Mateusz Guzik <mjguzik@gmail.com> says: Since path looku is being looked at, two extra nits from me: 1. some trivial jump avoidance in inode_permission() 2. but more importantly avoiding a memory access which is most likely a cache miss when descending into devcgroup_inode_permission() the file seems to have no maintainer fwiw anyhow I'm confident the way forward is to add IOP_FAST_MAY_EXEC (or similar) to elide inode_permission() in the common case to begin with. There are quite a few branches which straight up don't need execute. On top of that btrfs has a permission hook only to check for MAY_WRITE, which in case of path lookup is not set. With the above flag the call will be avoided. * patches from https://lore.kernel.org/20250416221626.2710239-1-mjguzik@gmail.com: device_cgroup: avoid access to ->i_rdev in the common case in devcgroup_inode_permission() fs: touch up predicts in inode_permission() Link: https://lore.kernel.org/20250416221626.2710239-1-mjguzik@gmail.com Signed-off-by: Christian Brauner <brauner@kernel.org>
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.