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A mirror of the official Linux kernel repository just in case
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Marco Elver 7302e91f39 mm/slab_common: use WARN() if cache still has objects on destroy 
Calling kmem_cache_destroy() while the cache still has objects allocated
is a kernel bug, and will usually result in the entire cache being
leaked.  While the message in kmem_cache_destroy() resembles a warning,
it is currently not implemented using a real WARN().

This is problematic for infrastructure testing the kernel, all of which
rely on the specific format of WARN()s to pick up on bugs.

Some 13 years ago this used to be a simple WARN_ON() in slub, but commit
d629d81957 ("slub: improve kmem_cache_destroy() error message")
changed it into an open-coded warning to avoid confusion with a bug in
slub itself.

Instead, turn the open-coded warning into a real WARN() with the message
preserved, so that test systems can actually identify these issues, and
we get all the other benefits of using a normal WARN().  The warning
message is extended with "when called from <caller-ip>" to make it even
clearer where the fault lies.

For most configurations this is only a cosmetic change, however, note
that WARN() here will now also respect panic_on_warn.

Link: https://lkml.kernel.org/r/20211102170733.648216-1-elver@google.com
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-01-15 16:30:25 +02:00
arch ia64: topology: use default_groups in kobj_type 2022-01-15 16:30:24 +02:00
block block-5.16-2021-12-19 2021-12-19 12:38:53 -08:00
certs certs: Add support for using elliptic curve keys for signing modules 2021-08-23 19:55:42 +03:00
crypto Update to zstd-1.4.10 2021-11-13 15:32:30 -08:00
Documentation SoC; Fixes for 5.16, part 4 2022-01-08 12:56:16 -08:00
drivers RDMA/siw: make use of the helper function kthread_run_on_cpu() 2022-01-15 16:30:23 +02:00
fs fs/ioctl: remove unnecessary __user annotation 2022-01-15 16:30:25 +02:00
include kthread: add the helper function kthread_run_on_cpu() 2022-01-15 16:30:23 +02:00
init kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x 2021-11-14 18:59:49 -08:00
ipc shm: extend forced shm destroy to support objects from several IPC nses 2021-11-20 10:35:54 -08:00
kernel trace/hwlat: make use of the helper function kthread_run_on_cpu() 2022-01-15 16:30:24 +02:00
lib Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2021-12-08 16:06:44 -08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/slab_common: use WARN() if cache still has objects on destroy 2022-01-15 16:30:25 +02:00
net Two more changes: 2022-01-04 07:18:28 -08:00
samples ftrace/samples: Add missing prototypes direct functions 2022-01-05 18:34:50 -05:00
scripts scripts/spelling.txt: add "oveflow" 2022-01-15 16:30:24 +02:00
security selinux/stable-5.16 PR 20211228 2021-12-28 13:33:06 -08:00
sound sound fixes for 5.16-rc7 2021-12-23 09:55:58 -08:00
tools perf tools fixes for v5.16: 6th batch 2022-01-09 10:37:07 -08:00
usr initramfs: Check timestamp to prevent broken cpio archive 2021-10-24 13:48:40 +09:00
virt KVM: downgrade two BUG_ONs to WARN_ON_ONCE 2021-11-26 06:43:28 -05:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: update email address for Guo Ren 2021-12-10 17:10:55 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS MAINTAINERS: update gpio-brcmstb maintainers 2022-01-03 10:53:02 +01:00
Makefile Linux 5.16 2022-01-09 14:55:34 -08:00
README

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.