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CPF_CURRENTPITCH starts swerving towards PTRX_PITCHTARGET as soon as that is set. In practice this means that CPF_FRACADDRESS may acquire a non-zero value before we manage to force CPF_CURRENTPITCH to the final value, which would prevent bit-for-bit reproduction. To avoid that this state persists, we now reset CPF_FRACADDRESS when setting CPF_CURRENTPITCH, and to (mostly) avoid that it progresses too far in the first place (possibly even reaching CCCA_CURRADDR), we write PTRX and CPF in one critical section (though NMIs, etc. still make this unreliable). Signed-off-by: Oswald Buddenhagen <oswald.buddenhagen@gmx.de> Link: https://lore.kernel.org/r/20230518140339.3722279-2-oswald.buddenhagen@gmx.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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.
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.