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Use ACQUIRE() to cleanup conditional locking paths in the CXL driver The ACQUIRE() macro and its associated ACQUIRE_ERR() helpers, like scoped_cond_guard(), arrange for scoped-based conditional locking. Unlike scoped_cond_guard(), these macros arrange for an ERR_PTR() to be retrieved representing the state of the conditional lock. The goal of this conversion is to complete the removal of all explicit unlock calls in the subsystem. I.e. the methods to acquire a lock are solely via guard(), scoped_guard() (for limited cases), or ACQUIRE(). All unlock is implicit / scope-based. In order to make sure all lock sites are converted, the existing rwsem's are consolidated and renamed in 'struct cxl_rwsem'. While that makes the patch noisier it gives a clean cut-off between old-world (explicit unlock allowed), and new world (explicit unlock deleted). Cc: David Lechner <dlechner@baylibre.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Fabio M. De Francesco <fabio.m.de.francesco@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Jonathan Cameron <jonathan.cameron@huawei.com> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Alison Schofield <alison.schofield@intel.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Ira Weiny <ira.weiny@intel.com> Cc: Shiju Jose <shiju.jose@huawei.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Reviewed-by: Fabio M. De Francesco <fabio.m.de.francesco@linux.intel.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Tested-by: Shiju Jose <shiju.jose@huawei.com> Link: https://patch.msgid.link/20250711234932.671292-9-dan.j.williams@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com>
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.