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6742e3425a
[ Upstream commit 8c96f1bc6fc49c724c4cdd22d3e99260263b7384 ] kmemleak_lock as a rwlock on RT can possibly be acquired in atomic context which does work. Since the kmemleak operation is performed in atomic context make it a raw_spinlock_t so it can also be acquired on RT. This is used for debugging and is not enabled by default in a production like environment (where performance/latency matters) so it makes sense to make it a raw_spinlock_t instead trying to get rid of the atomic context. Turn also the kmemleak_object->lock into raw_spinlock_t which is acquired (nested) while the kmemleak_lock is held. The time spent in "echo scan > kmemleak" slightly improved on 64core box with this patch applied after boot. [bigeasy@linutronix.de: redo the description, update comments. Merge the individual bits: He Zhe did the kmemleak_lock, Liu Haitao the ->lock and Yongxin Liu forwarded Liu's patch.] Link: http://lkml.kernel.org/r/20191219170834.4tah3prf2gdothz4@linutronix.de Link: https://lkml.kernel.org/r/20181218150744.GB20197@arrakis.emea.arm.com Link: https://lkml.kernel.org/r/1542877459-144382-1-git-send-email-zhe.he@windriver.com Link: https://lkml.kernel.org/r/20190927082230.34152-1-yongxin.liu@windriver.com Signed-off-by: He Zhe <zhe.he@windriver.com> Signed-off-by: Liu Haitao <haitao.liu@windriver.com> Signed-off-by: Yongxin Liu <yongxin.liu@windriver.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Stable-dep-of: 47b0f6d8f0d2 ("mm/kmemleak: avoid deadlock by moving pr_warn() outside kmemleak_lock") Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.