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8d769ea7bc
The two users of the return value from intel_engine_wakeup() are expecting different results. In the breadcrumbs hangcheck, we are using it to determine whether wake_up_process() detected the waiter was currently running (and if so we presume that it hasn't yet missed the interrupt). However, in the fake_irq path, we are using the return value as a check as to whether there are any waiters, and so we may incorrectly stop the fake-irq if that waiter was currently running. To handle the two different needs, return both bits of information! We uninline it from the irq path in preparation for the next patch which makes the irq hotpath special and relegates intel_engine_wakeup() to the slow fixup paths. v2: s/ret/result/ Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170227205850.2828-1-chris@chris-wilson.co.uk |
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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.