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8b92887ced
The POWER5 < DD2.1 issue is that slbie needs to be issued more than once. It came in with this change: ChangeSet@1.1608, 2004-04-29 07:12:31-07:00, david@gibson.dropbear.id.au [PATCH] POWER5 erratum workaround Early POWER5 revisions (<DD2.1) have a problem requiring slbie instructions to be repeated under some circumstances. The patch below adds a workaround (patch made by Anton Blanchard). (aka. 3e4520f7605243abf66a7ccd3d2e49e48e8c0483 in the full history tree) The extra slbie in switch_slb is done even for the case where slbia is called (slb_flush_and_rebolt). I don't believe that is required because there are other slb_flush_and_rebolt callers which do not issue the workaround slbie, which would be broken if it was required. It also seems to be fine inside the isync with the first slbie, as it is in the kernel stack switch code. So move this workaround to where it is required. This is not much of an optimisation because this is the fast path, but it makes the code more understandable and neater. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> [mpe: Retain slbie_data initialisation to avoid compiler warning] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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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.