linux-kernel - [PATCH 0/6] percpu: Implement Preemption checks for __this

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Date:	Tue, 15 Oct 2013 12:47:22 -0500
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	akpm@...uxfoundation.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 0/6] percpu: Implement Preemption checks for __this_cpu operations V4b

** Resending using Comcast instead of Amazon SES.

This patchset introduces preemption checks for __this_cpu operations.

First we add new raw_cpu operations that perform this cpu operations
without preempt checks in the future.

Then those raw_cpu operations are used in a number of locations to avoid
false positives.

The last patch then adds the preemption checks by modifying the
__this_cpu macros in include/linux/percpu.h

V3->v4:
	- Drop CONFIG_DEBUG_THIS_CPU_OPERATIONS
	- Detail operation triggering the log entry.
	- Use quilt 0.60/ [PATCH] prefix.
	- Clean up subject lines.
	- Include raw_cpu_ops conversion/fixes that were tested on
	  a Ubuntu 13.04 desktop.
	- Traces

V2->V3:
	- Subject line in the raw_cpu_ops patch had ; instead of :.
	  Guess I am getting old.
	- Improve descriptions and variable names.
	- Run tests again with kvm to verify that it still works.
		A) No warnings with just the patches applied
		B) Lots of warnings with CONFIG_DEBUG_THIS_CPU_OPERATIONS enabled
		C) No warnings with 3 core patches applied that simply convert
			__this_cpu operations to raw_cpu_ops.

V1->V2:
	- Reuse preemption check logic in lib/smp_processor_id.c
	- Add CONFIG_DEBUG_THIS_CPU_OPERATIONS
	- Remove conversions to the use of raw_cpu_ops since
	  these may require some discussion first.

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