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Hao Si a65d094db8 soc: fsl: dpio: Get the cpumask through cpumask_of(cpu) [ Upstream commit `2663b33885` ] The local variable 'cpumask_t mask' is in the stack memory, and its address is assigned to 'desc->affinity' in 'irq_set_affinity_hint()'. But the memory area where this variable is located is at risk of being modified. During LTP testing, the following error was generated: Unable to handle kernel paging request at virtual address ffff000012e9b790 Mem abort info: ESR = 0x96000007 Exception class = DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 Data abort info: ISV = 0, ISS = 0x00000007 CM = 0, WnR = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp = 0000000075ac5e07 [ffff000012e9b790] pgd=00000027dbffe003, pud=00000027dbffd003, pmd=00000027b6d61003, pte=0000000000000000 Internal error: Oops: 96000007 [#1] PREEMPT SMP Modules linked in: xt_conntrack Process read_all (pid: 20171, stack limit = 0x0000000044ea4095) CPU: 14 PID: 20171 Comm: read_all Tainted: G B W Hardware name: NXP Layerscape LX2160ARDB (DT) pstate: 80000085 (Nzcv daIf -PAN -UAO) pc : irq_affinity_hint_proc_show+0x54/0xb0 lr : irq_affinity_hint_proc_show+0x4c/0xb0 sp : ffff00001138bc10 x29: ffff00001138bc10 x28: 0000ffffd131d1e0 x27: 00000000007000c0 x26: ffff8025b9480dc0 x25: ffff8025b9480da8 x24: 00000000000003ff x23: ffff8027334f8300 x22: ffff80272e97d000 x21: ffff80272e97d0b0 x20: ffff8025b9480d80 x19: ffff000009a49000 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000040 x11: 0000000000000000 x10: ffff802735b79b88 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff000009a49848 x6 : 0000000000000003 x5 : 0000000000000000 x4 : ffff000008157d6c x3 : ffff00001138bc10 x2 : ffff000012e9b790 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: irq_affinity_hint_proc_show+0x54/0xb0 seq_read+0x1b0/0x440 proc_reg_read+0x80/0xd8 __vfs_read+0x60/0x178 vfs_read+0x94/0x150 ksys_read+0x74/0xf0 __arm64_sys_read+0x24/0x30 el0_svc_common.constprop.0+0xd8/0x1a0 el0_svc_handler+0x34/0x88 el0_svc+0x10/0x14 Code: f9001bbf 943e0732 f94066c2 b4000062 (f9400041) ---[ end trace b495bdcb0b3b732b ]--- Kernel panic - not syncing: Fatal exception SMP: stopping secondary CPUs SMP: failed to stop secondary CPUs 0,2-4,6,8,11,13-15 Kernel Offset: disabled CPU features: 0x0,21006008 Memory Limit: none ---[ end Kernel panic - not syncing: Fatal exception ]--- Fix it by using 'cpumask_of(cpu)' to get the cpumask. Signed-off-by: Hao Si <si.hao@zte.com.cn> Signed-off-by: Lin Chen <chen.lin5@zte.com.cn> Signed-off-by: Yi Wang <wang.yi59@zte.com.cn> Signed-off-by: Li Yang <leoyang.li@nxp.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-12-30 11:25:38 +01:00
arch	ARC: stack unwinding: don't assume non-current task is sleeping	2020-12-30 11:25:38 +01:00
block	blk-cgroup: Pre-allocate tree node on blkg_conf_prep	2020-11-10 12:35:59 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: algif_skcipher - EBUSY on aio should be an error	2020-10-29 09:55:01 +01:00
Documentation	dt-bindings: net: correct interrupt flags in examples	2020-12-08 10:18:55 +01:00
drivers	soc: fsl: dpio: Get the cpumask through cpumask_of(cpu)	2020-12-30 11:25:38 +01:00
firmware	Fix built-in early-load Intel microcode alignment	2020-01-23 08:21:29 +01:00
fs	gfs2: check for empty rgrp tree in gfs2_ri_update	2020-12-11 13:25:04 +01:00
include	spi: Introduce device-managed SPI controller allocation	2020-12-11 13:25:03 +01:00
init	printk: reduce LOG_BUF_SHIFT range for H8300	2020-11-05 11:08:41 +01:00
ipc	ipc/util.c: sysvipc_find_ipc() incorrectly updates position index	2020-05-20 08:18:40 +02:00
kernel	tracing: Fix userstacktrace option for instances	2020-12-11 13:25:03 +01:00
lib	random32: make prandom_u32() output unpredictable	2020-11-18 19:18:52 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm/swapfile: do not sleep with a spin lock held	2020-12-11 13:25:02 +01:00
net	netfilter: nf_tables: avoid false-postive lockdep splat	2020-12-11 13:25:04 +01:00
samples	misc: vop: add round_up(x,4) for vring_size to avoid kernel panic	2020-10-30 10:38:29 +01:00
scripts	scripts/setlocalversion: make git describe output more reliable	2020-11-05 11:08:31 +01:00
security	selinux: Fix error return code in sel_ib_pkey_sid_slow()	2020-11-18 19:18:50 +01:00
sound	ALSA: hda/generic: Add option to enforce preferred_dacs pairs	2020-12-11 13:25:01 +01:00
tools	x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes	2020-12-11 13:25:02 +01:00
usr	initramfs: restore default compression behavior	2020-04-13 10:44:59 +02:00
virt	KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace	2020-12-02 08:48:07 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +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 updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	Documentation/llvm: add documentation on building w/ Clang/LLVM	2020-09-26 18:01:31 +02:00
Makefile	Kbuild: do not emit debug info for assembly with LLVM_IAS=1	2020-12-30 11:25:37 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

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.
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.