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Jens Axboe 7a60d6d7b3 mm: use filemap_range_needs_writeback() for O_DIRECT reads
For the generic page cache read helper, use the better variant of checking
for the need to call filemap_write_and_wait_range() when doing O_DIRECT
reads.  This avoids falling back to the slow path for IOCB_NOWAIT, if
there are no pages to wait for (or write out).

Link: https://lkml.kernel.org/r/20210224164455.1096727-3-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-04-30 11:20:36 -07:00
arch mm/memtest: add ARCH_USE_MEMTEST 2021-04-30 11:20:36 -07:00
block
certs
crypto
Documentation mm/page_owner: record the timestamp of all pages during free 2021-04-30 11:20:36 -07:00
drivers
fs vfs: fs_parser: clean up kernel-doc warnings 2021-04-30 11:20:35 -07:00
include mm: provide filemap_range_needs_writeback() helper 2021-04-30 11:20:36 -07:00
init Kconfig updates for v5.13 2021-04-29 14:32:00 -07:00
ipc
kernel watchdog: cleanup handling of false positives 2021-04-30 11:20:36 -07:00
lib mm/memtest: add ARCH_USE_MEMTEST 2021-04-30 11:20:36 -07:00
LICENSES
mm mm: use filemap_range_needs_writeback() for O_DIRECT reads 2021-04-30 11:20:36 -07:00
net
samples kfifo: fix ternary sign extension bugs 2021-04-30 11:20:35 -07:00
scripts scripts: a new script for checking duplicate struct declaration 2021-04-30 11:20:35 -07:00
security
sound
tools Kbuild updates for v5.13 2021-04-29 14:24:39 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Kbuild updates for v5.13 2021-04-29 14:24:39 -07:00
Makefile Kconfig updates for v5.13 2021-04-29 14:32:00 -07:00
README

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.