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uclamp_fork() resets the uclamp values to their default when the reset-on-fork flag is set. It also checks whether the task has a RT policy, and sets its uclamp.min to 1024 accordingly. However, during reset-on-fork, the task's policy is lowered to SCHED_NORMAL right after, hence leading to an erroneous uclamp.min setting for the new task if it was forked from RT. Fix this by removing the unnecessary check on rt_task() in uclamp_fork() as this doesn't make sense if the reset-on-fork flag is set. [ qperret: BACKPORT because of a conflict with the Android-specific SUGOV_RT_MAX_FREQ sched_feat, which is equally unnecessary in this path ] Bug: 120440300 Fixes:1a00d99997("sched/uclamp: Set default clamps for RT tasks") Reported-by: Chitti Babu Theegala <ctheegal@codeaurora.org> Signed-off-by: Quentin Perret <qperret@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Patrick Bellasi <patrick.bellasi@matbug.net> Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Link: https://lkml.kernel.org/r/20200416085956.217587-1-qperret@google.com (cherry picked from commiteaf5a92ebd) Signed-off-by: Quentin Perret <qperret@google.com> Change-Id: I9a19ac5474d0508b8437e4a1d859573b4106ed08
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.