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Boris Brezillon 47b2d73b5a drm/panthor: Fix the logic that decides when to stop ticking 
[ Upstream commit 61d9a43d70 ]

When we have multiple active groups with the same priority, we need to
keep ticking for the priority rotation to take place. If we don't do
that, we might starve slots with lower priorities.

It's annoying to deal with that in tick_ctx_update_resched_target(),
so let's add a ::stop_tick field to the tick context which is
initialized to true, and downgraded to false as soon as we detect
something that requires to tick to happen. This way we can complement
the current logic with extra conditions if needed.

v2:
- Add R-b

v3:
- Drop panthor_sched_tick_ctx::min_priority (no longer relevant)
- Collect R-b

Fixes: de85488138 ("drm/panthor: Add the scheduler logical block")
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Link: https://patch.msgid.link/20251128094839.3856402-7-boris.brezillon@collabora.com
Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:19:48 -05:00
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README 

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 reStructuredText 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.