Mark Rutland f83cbd14c7 arm64: fix rodata=full ... commit 2e8cff0a0e upstream. On arm64, "rodata=full" has been suppored (but not documented) since commit: c55191e96c ("arm64: mm: apply r/o permissions of VM areas to its linear alias as well") As it's necessary to determine the rodata configuration early during boot, arm64 has an early_param() handler for this, whereas init/main.c has a __setup() handler which is run later. Unfortunately, this split meant that since commit: f9a40b0890 ("init/main.c: return 1 from handled __setup() functions") ... passing "rodata=full" would result in a spurious warning from the __setup() handler (though RO permissions would be configured appropriately). Further, "rodata=full" has been broken since commit: 0d6ea3ac94 ("lib/kstrtox.c: add "false"/"true" support to kstrtobool()") ... which caused strtobool() to parse "full" as false (in addition to many other values not documented for the "rodata=" kernel parameter. This patch fixes this breakage by: * Moving the core parameter parser to an __early_param(), such that it is available early. * Adding an (optional) arch hook which arm64 can use to parse "full". * Updating the documentation to mention that "full" is valid for arm64. * Having the core parameter parser handle "on" and "off" explicitly, such that any undocumented values (e.g. typos such as "ful") are reported as errors rather than being silently accepted. Note that __setup() and early_param() have opposite conventions for their return values, where __setup() uses 1 to indicate a parameter was handled and early_param() uses 0 to indicate a parameter was handled. Fixes: f9a40b0890 ("init/main.c: return 1 from handled __setup() functions") Fixes: 0d6ea3ac94 ("lib/kstrtox.c: add "false"/"true" support to kstrtobool()") Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jagdish Gediya <jvgediya@linux.ibm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Will Deacon <will@kernel.org> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Link: https://lore.kernel.org/r/20220817154022.3974645-1-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2022-08-31 17:18:19 +02:00
..
Kconfig	gcc-12: disable '-Warray-bounds' universally for now	2022-06-09 10:11:12 -07:00
Makefile	sched/preempt: Tell about PREEMPT_DYNAMIC on kernel headers	2022-03-11 15:36:35 +01:00
calibrate.c	…
do_mounts.c	block: remove genhd.h	2022-02-02 07:49:59 -07:00
do_mounts.h	…
do_mounts_initrd.c	kernel/do_mount_initrd: move real_root_dev sysctls to its own file	2022-04-06 13:43:44 -07:00
do_mounts_rd.c	…
init_task.c	kcsan: Remove redundant zero-initialization of globals	2021-12-09 16:42:26 -08:00
initramfs.c	This set of changes updates init and user mode helper tasks to be	2022-06-03 16:03:05 -07:00
main.c	arm64: fix rodata=full	2022-08-31 17:18:19 +02:00
noinitramfs.c	init: move usermodehelper_enable() to populate_rootfs()	2021-09-08 11:50:27 -07:00
version.c	kbuild: add an elfnote for whether vmlinux is built with lto	2021-04-25 05:25:42 +09:00