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5fd691afdf
Mark found ldsem_cmpxchg() needed an (atomic_long_t *) cast to keep working after making the atomic_long interface type safe. Needing casts is bad form, which made me look at the code. There are no ld_semaphore::count users outside of these functions so there is no reason why it can not be an atomic_long_t in the first place, obviating the need for this cast. That also ensures the loads use atomic_long_read(), which implies (at least) READ_ONCE() in order to guarantee single-copy-atomic loads. When using atomic_long_try_cmpxchg() the ldsem_cmpxchg() wrapper gets very thin (the only difference is not changing *old on success, which most callers don't seem to care about). So rework the whole thing to use atomic_long_t and its accessors directly. While there, fixup all the horrible comment styles. Cc: Peter Hurley <peter@hurleysoftware.com> Reported-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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 Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
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.