TWx Linux Repository
ee5eda8ea5
a194dfe6e6f6 ("pipe: Rearrange sequence in pipe_write() to preallocate slot")
changed pipe_write() to increment pipe->head in advance. IIUC to avoid the
race with the post_one_notification()-like code which can add another buffer
under pipe->rd_wait.lock without pipe->mutex.
This is no longer necessary after c73be61cede5 ("pipe: Add general notification
queue support"), pipe_write() checks pipe_has_watch_queue() and returns -EXDEV
at the start. And can't help in any case, pipe_write() no longer takes this
rd_wait.lock spinlock.
Change pipe_write() to call copy_page_from_iter() first and do nothing if it
fails. This way pipe_write() can't add a zero-sized buffer and we can simplify
pipe_read() which currently has to take care of this very unlikely case.
Also, with this patch we can probably kill eat_empty_buffer() and more
"is this buffer empty" checks in fs/splice.c later.
Link: https://lore.kernel.org/all/20250209150718.GA17013@redhat.com/
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20250210114039.GA3588@redhat.com
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 reStructuredText 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.