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Conor Dooley 9493e6f3ce RISC-V: take text_mutex during alternative patching Guenter reported a splat during boot, that Samuel pointed out was the lockdep assertion failing in patch_insn_write(): WARNING: CPU: 0 PID: 0 at arch/riscv/kernel/patch.c:63 patch_insn_write+0x222/0x2f6 epc : patch_insn_write+0x222/0x2f6 ra : patch_insn_write+0x21e/0x2f6 epc : ffffffff800068c6 ra : ffffffff800068c2 sp : ffffffff81803df0 gp : ffffffff81a1ab78 tp : ffffffff81814f80 t0 : ffffffffffffe000 t1 : 0000000000000001 t2 : 4c45203a76637369 s0 : ffffffff81803e40 s1 : 0000000000000004 a0 : 0000000000000000 a1 : ffffffffffffffff a2 : 0000000000000004 a3 : 0000000000000000 a4 : 0000000000000001 a5 : 0000000000000000 a6 : 0000000000000000 a7 : 0000000052464e43 s2 : ffffffff80b4889c s3 : 000000000000082c s4 : ffffffff80b48828 s5 : 0000000000000828 s6 : ffffffff8131a0a0 s7 : 0000000000000fff s8 : 0000000008000200 s9 : ffffffff8131a520 s10: 0000000000000018 s11: 000000000000000b t3 : 0000000000000001 t4 : 000000000000000d t5 : ffffffffd8180000 t6 : ffffffff81803bc8 status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003 [<ffffffff800068c6>] patch_insn_write+0x222/0x2f6 [<ffffffff80006a36>] patch_text_nosync+0xc/0x2a [<ffffffff80003b86>] riscv_cpufeature_patch_func+0x52/0x98 [<ffffffff80003348>] _apply_alternatives+0x46/0x86 [<ffffffff80c02d36>] apply_boot_alternatives+0x3c/0xfa [<ffffffff80c03ad8>] setup_arch+0x584/0x5b8 [<ffffffff80c0075a>] start_kernel+0xa2/0x8f8 This issue was exposed by `702e64550b` ("riscv: fpu: switch has_fpu() to riscv_has_extension_likely()"), as it is the patching in has_fpu() that triggers the splats in Guenter's report. Take the text_mutex before doing any code patching to satisfy lockdep. Fixes: `ff689fd21c` ("riscv: add RISC-V Svpbmt extension support") Fixes: `a35707c3d8` ("riscv: add memory-type errata for T-Head") Fixes: `1a0e5dbd37` ("riscv: sifive: Add SiFive alternative ports") Reported-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/all/20230212154333.GA3760469@roeck-us.net/ Signed-off-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Samuel Holland <samuel@sholland.org> Tested-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20230212194735.491785-1-conor@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2023-02-21 17:21:33 -08:00
arch	RISC-V: take text_mutex during alternative patching	2023-02-21 17:21:33 -08:00
block	treewide: Convert del_timer() to timer_shutdown()	2022-12-25 13:38:09 -08:00
certs	certs: make system keyring depend on built-in x509 parser	2022-09-24 04:31:18 +09:00
crypto	This update includes the following changes:	2022-12-14 12:31:09 -08:00
Documentation	Merge patch series "dt-bindings: Add a cpu-capacity property for RISC-V"	2023-02-14 19:29:46 -08:00
drivers	treewide: Convert del_timer() to timer_shutdown()	2022-12-25 13:38:09 -08:00
fs	treewide: Convert del_timer() to timer_shutdown()	2022-12-25 13:38:09 -08:00
include	9p-for-6.2-rc1	2022-12-23 11:39:18 -08:00
init	Kbuild updates for v6.2	2022-12-19 12:33:32 -06:00
io_uring	io_uring/net: fix cleanup after recycle	2022-12-19 08:28:28 -07:00
ipc	Non-MM patches for 6.2-rc1.	2022-12-12 17:28:58 -08:00
kernel	kernel hardening fixes for v6.2-rc1	2022-12-23 12:00:24 -08:00
lib	test_maple_tree: add test for mas_spanning_rebalance() on insufficient data	2022-12-21 14:31:52 -08:00
LICENSES	LICENSES: Add the copyleft-next-0.3.1 license	2022-11-08 15:44:01 +01:00
mm	hugetlb: really allocate vma lock for all sharable vmas	2022-12-21 14:31:52 -08:00
net	treewide: Convert del_timer() to timer_shutdown()	2022-12-25 13:38:09 -08:00
rust	rust: types: add `Opaque` type	2022-12-04 01:59:16 +01:00
samples	Char/Misc driver changes for 6.2-rc1	2022-12-16 03:49:24 -08:00
scripts	modernize use of grep in coccicheck	2022-12-23 13:56:41 -08:00
security	kernel hardening fixes for v6.2-rc1	2022-12-23 12:00:24 -08:00
sound	treewide: Convert del_timer() to timer_shutdown()	2022-12-25 13:38:09 -08:00
tools	perf tools fixes and improvements for v6.2: 2nd batch	2022-12-22 11:07:29 -08:00
usr	usr/gen_init_cpio.c: remove unnecessary -1 values from int file	2022-10-03 14:21:44 -07:00
virt	ARM64:	2022-12-15 11:12:21 -08:00
.clang-format	iommufd for 6.2	2022-12-14 09:15:43 -08:00
.cocciconfig
.get_maintainer.ignore	get_maintainer: add Alan to .get_maintainer.ignore	2022-08-20 15:17:44 -07:00
.gitattributes
.gitignore	kbuild: Cleanup DT Overlay intermediate files as appropriate	2022-11-18 14:45:30 -06:00
.mailmap	Non-MM patches for 6.2-rc1.	2022-12-12 17:28:58 -08:00
.rustfmt.toml	rust: add `.rustfmt.toml`	2022-09-28 09:02:20 +02:00
COPYING	COPYING: state that all contributions really are covered by this file	2020-02-10 13:32:20 -08:00
CREDITS	MAINTAINERS: zram: zsmalloc: Add an additional co-maintainer	2022-12-15 16:37:49 -08:00
Kbuild	Kbuild updates for v6.1	2022-10-10 12:00:45 -07:00
Kconfig	kbuild: ensure full rebuild when the compiler is updated	2020-05-12 13:28:33 +09:00
MAINTAINERS	MAINTAINERS: add an IRC entry for RISC-V	2023-01-19 16:37:10 -08:00
Makefile	Linux 6.2-rc1	2022-12-25 13:41:39 -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.