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On POWER8 and POWER9, the PMSR and the PMCR registers define pstates to be 8-bit wide values. The device-tree exports pstates as 32-bit wide values of which the lower byte is the actual pstate. The current implementation in the kernel treats pstates as integer type, since it used to use the sign of the pstate for performing some boundary-checks. This is no longer required after the patch "powernv-cpufreq: Fix pstate_to_idx() to handle non-continguous pstates". So, in this patch, we modify the powernv-cpufreq driver to uniformly treat pstates as opaque 8-bit values obtained from the device-tree or the PMCR. This simplifies the extract_pstate() helper function since we no longer no longer require to worry about the sign-extentions. Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.