From 1eeac51e6201c1c0980fcdae73dbbe34811f8503 Mon Sep 17 00:00:00 2001 From: Andrey Konovalov Date: Thu, 24 Mar 2022 18:11:41 -0700 Subject: [PATCH] kasan: mark kasan_arg_stacktrace as __initdata 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 Suggested-by: Marco Elver Acked-by: Marco Elver Cc: Alexander Potapenko Cc: Andrey Ryabinin Cc: Catalin Marinas Cc: Dmitry Vyukov Cc: Evgenii Stepanov Cc: Mark Rutland Cc: Peter Collingbourne Cc: Vincenzo Frascino Cc: Will Deacon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/kasan/hw_tags.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c index 2e9378a4f07f..6509809dd5d8 100644 --- a/mm/kasan/hw_tags.c +++ b/mm/kasan/hw_tags.c @@ -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) { /* -- 2.20.1