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kasan: mark kasan_arg_stacktrace as __initdata

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As kasan_arg_stacktrace is only used in __init functions, mark it as
__initdata instead of __ro_after_init to allow it be freed after boot.

The other enums for KASAN args are used in kasan_init_hw_tags_cpu(), which
is not marked as __init as a CPU can be hot-plugged after boot.  Clarify
this in a comment.

Link: https://lkml.kernel.org/r/7fa090865614f8e0c6c1265508efb1d429afaa50.1643047180.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Suggested-by: Marco Elver <elver@google.com>
Acked-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2022-03-24 18:11:41 -07:00 committed by Linus Torvalds
parent 36c4a73bf8
commit 1eeac51e62
1 changed files with 5 additions and 2 deletions
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7
mm/kasan/hw_tags.c
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@ -40,7 +40,7 @@ enum kasan_arg_stacktrace {
static enum kasan_arg kasan_arg __ro_after_init;
static enum kasan_arg_mode kasan_arg_mode __ro_after_init;
static enum kasan_arg_stacktrace kasan_arg_stacktrace __ro_after_init;
static enum kasan_arg_stacktrace kasan_arg_stacktrace __initdata;
/* Whether KASAN is enabled at all. */
DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled);
@ -116,7 +116,10 @@ static inline const char *kasan_mode_info(void)
return "sync";
}
/* kasan_init_hw_tags_cpu() is called for each CPU. */
/*
* kasan_init_hw_tags_cpu() is called for each CPU.
* Not marked as __init as a CPU can be hot-plugged after boot.
*/
void kasan_init_hw_tags_cpu(void)
{
/*