Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH] x86: mark native_set_p4d() as __always_inline | Date | Tue, 5 Jun 2018 13:35:15 +0200 |
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When CONFIG_OPTIMIZE_INLINING is enabled, the function native_set_p4d() may not be fully inlined into the caller, resulting in a false-positive warning about an access to the __pgtable_l5_enabled variable from a non-__init function, despite the original caller being an __init function:
WARNING: vmlinux.o(.text.unlikely+0x1429): Section mismatch in reference from the function native_set_p4d() to the variable .init.data:__pgtable_l5_enabled WARNING: vmlinux.o(.text.unlikely+0x1429): Section mismatch in reference from the function native_p4d_clear() to the variable .init.data:__pgtable_l5_enabled The function native_set_p4d() references the variable __initdata __pgtable_l5_enabled. This is often because native_set_p4d lacks a __initdata annotation or the annotation of __pgtable_l5_enabled is wrong.
Marking the native_set_p4d function and its caller native_p4d_clear() avoids this problem.
I did not bisect the original cause, but I assume this is related to the recent rework that turned pgtable_l5_enabled() into an inline function, which in turn caused the compiler to make different inlining decisions.
Fixes: ad3fe525b950 ("x86/mm: Unify pgtable_l5_enabled usage in early boot code") Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- arch/x86/include/asm/pgtable_64.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h index 3c5385f9a88f..0fdcd21dadbd 100644 --- a/arch/x86/include/asm/pgtable_64.h +++ b/arch/x86/include/asm/pgtable_64.h @@ -216,7 +216,7 @@ static inline pgd_t pti_set_user_pgd(pgd_t *pgdp, pgd_t pgd) } #endif -static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d) +static __always_inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d) { pgd_t pgd; @@ -230,7 +230,7 @@ static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d) *p4dp = native_make_p4d(native_pgd_val(pgd)); } -static inline void native_p4d_clear(p4d_t *p4d) +static __always_inline void native_p4d_clear(p4d_t *p4d) { native_set_p4d(p4d, native_make_p4d(0)); } -- 2.9.0
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