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authorPeter Zijlstra <peterz@infradead.org>2024-03-13 21:01:03 +0300
committerIngo Molnar <mingo@kernel.org>2024-03-22 13:18:16 +0300
commit91a1d97ef482c1e4c9d4c1c656a53b0f6b16d0ed (patch)
tree0a5984cd9f64775013f069da345663f8330854c9 /include/asm-generic
parent3774b28d8f3b9e8a946beb9550bee85e5454fc9f (diff)
downloadlinux-91a1d97ef482c1e4c9d4c1c656a53b0f6b16d0ed.tar.xz
jump_label,module: Don't alloc static_key_mod for __ro_after_init keys
When a static_key is marked ro_after_init, its state will never change (after init), therefore jump_label_update() will never need to iterate the entries, and thus module load won't actually need to track this -- avoiding the static_key::next write. Therefore, mark these keys such that jump_label_add_module() might recognise them and avoid the modification. Use the special state: 'static_key_linked(key) && !static_key_mod(key)' to denote such keys. jump_label_add_module() does not exist under CONFIG_JUMP_LABEL=n, so the newly-introduced jump_label_init_ro() can be defined as a nop for that configuration. [ mingo: Renamed jump_label_ro() to jump_label_init_ro() ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Valentin Schneider <vschneid@redhat.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Josh Poimboeuf <jpoimboe@kernel.org> Link: https://lore.kernel.org/r/20240313180106.2917308-2-vschneid@redhat.com
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/sections.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index db13bb620f52..c768de6f19a9 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -180,6 +180,11 @@ static inline bool is_kernel_rodata(unsigned long addr)
addr < (unsigned long)__end_rodata;
}
+static inline bool is_kernel_ro_after_init(unsigned long addr)
+{
+ return addr >= (unsigned long)__start_ro_after_init &&
+ addr < (unsigned long)__end_ro_after_init;
+}
/**
* is_kernel_inittext - checks if the pointer address is located in the
* .init.text section