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Currently we implement flushing of the page walk cache (PWC) by calling _tlbiel_pid() with a RIC (Radix Invalidation Control) value of 1 which says to only flush the PWC. But _tlbiel_pid() loops over each set (congruence class) of the TLB, which is not necessary when we're just flushing the PWC. In fact the set argument is ignored for a PWC flush, so essentially we're just flushing the PWC 127 extra times for no benefit. Fix it by adding tlbiel_pwc() which just does a single flush of the PWC. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> [mpe: Split out of combined patch, drop _ in name, rewrite change log] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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.