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It is possible to cause KCSAN to ignore marked accesses by applying
__no_kcsan to the function or applying data_race() to the marked accesses.
These approaches allow the developer to restrict compiler optimizations
while also causing KCSAN to ignore diagnostic accesses.
This commit therefore updates the documentation accordingly.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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Data loaded for use by some sorts of heuristics can tolerate the
occasional erroneous value. In this case the loads may use data_race()
to give the compiler full freedom to optimize while also informing KCSAN
of the intent. However, for this to work, the heuristic needs to be
able to tolerate any erroneous value that could possibly arise. This
commit therefore adds a paragraph spelling this out.
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit adds example code for heuristic lockless reads, based loosely
on the sem_lock() and sem_unlock() functions.
[ paulmck: Apply Alan Stern and Manfred Spraul feedback. ]
Reported-by: Manfred Spraul <manfred@colorfullife.com>
[ paulmck: Update per Manfred Spraul and Hillf Danton feedback. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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The current definition of read_foo_diagnostic() in the "Lock Protection
With Lockless Diagnostic Access" section returns a value, which could
be use for any purpose. This could mislead people into incorrectly
using data_race() in cases where READ_ONCE() is required. This commit
therefore makes read_foo_diagnostic() simply print the value read.
Reported-by: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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This commit adapts the "Concurrency bugs should fear the big bad data-race
detector (part 2)" LWN article (https://lwn.net/Articles/816854/)
to kernel-documentation form. This allows more easily updating the
material as needed.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
[ paulmck: Apply Marco Elver feedback. ]
[ paulmck: Update per Akira Yokosawa feedback. ]
Reviewed-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
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