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Ido Schimmel cc6af90896 ipv4: Silence suspicious RCU usage warning [ Upstream commit `83f3522860` ] fib_trie_unmerge() is called with RTNL held, but not from an RCU read-side critical section. This leads to the following warning [1] when the FIB alias list in a leaf is traversed with hlist_for_each_entry_rcu(). Since the function is always called with RTNL held and since modification of the list is protected by RTNL, simply use hlist_for_each_entry() and silence the warning. [1] WARNING: suspicious RCU usage 5.8.0-rc4-custom-01520-gc1f937f3f83b #30 Not tainted ----------------------------- net/ipv4/fib_trie.c:1867 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by ip/164: #0: ffffffff85a27850 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x49a/0xbd0 stack backtrace: CPU: 0 PID: 164 Comm: ip Not tainted 5.8.0-rc4-custom-01520-gc1f937f3f83b #30 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-2.fc32 04/01/2014 Call Trace: dump_stack+0x100/0x184 lockdep_rcu_suspicious+0x153/0x15d fib_trie_unmerge+0x608/0xdb0 fib_unmerge+0x44/0x360 fib4_rule_configure+0xc8/0xad0 fib_nl_newrule+0x37a/0x1dd0 rtnetlink_rcv_msg+0x4f7/0xbd0 netlink_rcv_skb+0x17a/0x480 rtnetlink_rcv+0x22/0x30 netlink_unicast+0x5ae/0x890 netlink_sendmsg+0x98a/0xf40 ____sys_sendmsg+0x879/0xa00 ___sys_sendmsg+0x122/0x190 __sys_sendmsg+0x103/0x1d0 __x64_sys_sendmsg+0x7d/0xb0 do_syscall_64+0x54/0xa0 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc80a234e97 Code: Bad RIP value. RSP: 002b:00007ffef8b66798 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc80a234e97 RDX: 0000000000000000 RSI: 00007ffef8b66800 RDI: 0000000000000003 RBP: 000000005f141b1c R08: 0000000000000001 R09: 0000000000000000 R10: 00007fc80a2a8ac0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007ffef8b67008 R15: 0000556fccb10020 Fixes: `0ddcf43d5d` ("ipv4: FIB Local/MAIN table collapse") Signed-off-by: Ido Schimmel <idosch@mellanox.com> Reviewed-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-08-21 09:48:00 +02:00
Documentation	doc: dt: bindings: usb: dwc3: Update entries for disabling SS instances in park mode	2020-07-22 09:22:23 +02:00
arch	ARM: 8702/1: head-common.S: Clear lr before jumping to start_kernel()	2020-08-07 09:38:42 +02:00
block	block/bio-integrity: don't free 'buf' if bio_integrity_add_page() failed	2020-06-30 15:37:57 -04:00
certs	Replace magic for trusting the secondary keyring with #define	2018-09-09 19:55:54 +02:00
crypto	crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock()	2020-07-09 09:36:30 +02:00
drivers	Drivers: hv: vmbus: Ignore CHANNELMSG_TL_CONNECT_RESULT(23)	2020-08-21 09:48:00 +02:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:20:30 +01:00
fs	xattr: break delegations in {set,remove}xattr	2020-08-21 09:48:00 +02:00
include	xattr: break delegations in {set,remove}xattr	2020-08-21 09:48:00 +02:00
init	x86: Fix early boot crash on gcc-10, third try	2020-05-20 08:17:15 +02:00
ipc	ipc/util.c: sysvipc_find_ipc() incorrectly updates position index	2020-05-20 08:17:07 +02:00
kernel	random32: update the net random state on interrupt and activity	2020-08-07 09:38:41 +02:00
lib	random32: remove net_rand_state from the latent entropy gcc plugin	2020-08-07 09:38:41 +02:00
mm	mm/page_owner.c: remove drain_all_pages from init_early_allocated_pages	2020-07-31 16:44:45 +02:00
net	ipv4: Silence suspicious RCU usage warning	2020-08-21 09:48:00 +02:00
samples	samples: bpf: Fix build error	2020-06-03 08:17:55 +02:00
scripts	scripts/decode_stacktrace: strip basepath from all paths	2020-07-29 07:42:54 +02:00
security	apparmor: don't try to replace stale label in ptraceme check	2020-06-30 15:37:57 -04:00
sound	ALSA: seq: oss: Serialize ioctls	2020-08-21 09:47:57 +02:00
tools	tools lib traceevent: Fix memory leak in process_dynamic_array_len	2020-08-21 09:48:00 +02:00
usr	initramfs: restore default compression behavior	2020-04-13 10:34:19 +02:00
virt	KVM: arm: vgic: Fix limit condition when writing to GICD_I[CS]ACTIVER	2020-05-20 08:16:58 +02:00
.cocciconfig	…
.get_maintainer.ignore	…
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	kbuild: rpm-pkg: keep spec file until make mrproper	2018-02-13 10:19:46 +01:00
.mailmap	.mailmap: Add Maciej W. Rozycki's Imagination e-mail address	2017-11-10 12:16:15 -08:00
COPYING	…
CREDITS	MAINTAINERS: update TPM driver infrastructure changes	2017-11-09 17:58:40 -08:00
Kbuild	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
MAINTAINERS	MAINTAINERS: Update drm/i915 bug filing URL	2020-02-28 16:36:12 +01:00
Makefile	Linux 4.14.193	2020-08-07 09:38:42 +02:00
README	README: add a new README file, pointing to the Documentation/	2016-10-24 08:12:35 -02:00

README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.