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Christian Brauner <brauner@kernel.org> says: A few months ago I did work to make override_creds()/revert_creds() completely reference count free - mostly for the sake of overlayfs but it has been beneficial to everyone using this. In a recent pull request from Jens that introduced another round of override_creds()/revert_creds() for nbd Linus asked whether we could avoide the prepare_kernel_creds() calls that duplicate the kernel credentials and then drop them again later. Yes, we can actually. We can use the guard infrastructure to completely avoid the allocation and then also to never expose the temporary variable to hold the kernel credentials anywhere in the callers. So add with_kernel_creds() and scoped_with_kernel_creds() for this purpose. Also take the opportunity to fixup the scoped_class() macro I introduced two cycles ago. * patches from https://patch.msgid.link/20251103-work-creds-init_cred-v1-0-cb3ec8711a6a@kernel.org: unix: don't copy creds target: don't copy kernel creds nbd: don't copy kernel creds firmware: don't copy kernel creds cred: add {scoped_}with_kernel_creds cred: make init_cred static cred: add kernel_cred() helper cleanup: fix scoped_class() Link: https://patch.msgid.link/20251103-work-creds-init_cred-v1-0-cb3ec8711a6a@kernel.org 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.