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f97f713dc2
Introduces ASSERT_EXCLUSIVE_WRITER() and ASSERT_EXCLUSIVE_ACCESS(), which
may be used to assert properties of synchronization logic, where
violation cannot be detected as a normal data race.
Examples of the reports that may be generated:
==================================================================
BUG: KCSAN: assert: race in test_thread / test_thread
write to 0xffffffffab3d1540 of 8 bytes by task 466 on cpu 2:
test_thread+0x8d/0x111
debugfs_write.cold+0x32/0x44
...
assert no writes to 0xffffffffab3d1540 of 8 bytes by task 464 on cpu 0:
test_thread+0xa3/0x111
debugfs_write.cold+0x32/0x44
...
==================================================================
==================================================================
BUG: KCSAN: assert: race in test_thread / test_thread
assert no accesses to 0xffffffffab3d1540 of 8 bytes by task 465 on cpu 1:
test_thread+0xb9/0x111
debugfs_write.cold+0x32/0x44
...
read to 0xffffffffab3d1540 of 8 bytes by task 464 on cpu 0:
test_thread+0x77/0x111
debugfs_write.cold+0x32/0x44
...
==================================================================
Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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.
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.