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A recent lockdep report included these lines: [ 96.177910] 3 locks held by containerd/770: [ 96.177934] #0: ffff88810815ea28 (&mm->mmap_lock#2){++++}-{3:3}, at: do_user_addr_fault+0x115/0x770 [ 96.177999] #1: ffffffff82915020 (rcu_read_lock){....}-{1:2}, at: get_swap_device+0x33/0x140 [ 96.178057] #2: ffffffff82955ba0 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x5/0x30 While it was not useful to that bug report to know where the reclaim lock had been acquired, it might be useful under other circumstances. Allow the caller of __fs_reclaim_acquire to specify the instruction pointer to use. Link: https://lkml.kernel.org/r/20210719185709.1755149-1-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Omar Sandoval <osandov@fb.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Boqun Feng <boqun.feng@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.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.