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x86/mm: Hide mm_free_global_asid() definition under CONFIG_BROADCAST_TLB_FLUSH

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When CONFIG_BROADCAST_TLB_FLUSH is not enabled, mm_free_global_asid() remains
a globally visible symbol and generates a useless function call to it in
destroy_context(). Therefore, hide the mm_free_global_asid() definition under
CONFIG_BROADCAST_TLB_FLUSH and provide a static inline empty version when it
is not enabled to remove the function call.

Signed-off-by: Hou Wenlong <houwenlong.hwl@antgroup.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Rik van Riel <riel@surriel.com>
Link: https://patch.msgid.link/b262a8ec8076fb26bb692aaf113848b1e6f40e40.1768448079.git.houwenlong.hwl@antgroup.com
This commit is contained in:
Hou Wenlong 2026-01-15 11:38:34 +08:00 committed by Borislav Petkov (AMD)
parent 8a4e92b326
commit 954fc7ac15
3 changed files with 5 additions and 4 deletions
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2
arch/x86/include/asm/mmu_context.h
View File

@ -139,9 +139,7 @@ static inline void mm_reset_untag_mask(struct mm_struct *mm)
#define enter_lazy_tlb enter_lazy_tlb
extern void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk);
#define mm_init_global_asid mm_init_global_asid
extern void mm_init_global_asid(struct mm_struct *mm);
extern void mm_free_global_asid(struct mm_struct *mm);
/*

3
arch/x86/include/asm/tlbflush.h
View File

@ -292,9 +292,12 @@ static inline bool mm_in_asid_transition(struct mm_struct *mm)
return mm && READ_ONCE(mm->context.asid_transition);
}
extern void mm_free_global_asid(struct mm_struct *mm);
#else
static inline u16 mm_global_asid(struct mm_struct *mm) { return 0; }
static inline void mm_init_global_asid(struct mm_struct *mm) { }
static inline void mm_free_global_asid(struct mm_struct *mm) { }
static inline void mm_assign_global_asid(struct mm_struct *mm, u16 asid) { }
static inline void mm_clear_asid_transition(struct mm_struct *mm) { }
static inline bool mm_in_asid_transition(struct mm_struct *mm) { return false; }

4
arch/x86/mm/tlb.c
View File

@ -401,6 +401,7 @@ static void use_global_asid(struct mm_struct *mm)
mm_assign_global_asid(mm, asid);
}
#ifdef CONFIG_BROADCAST_TLB_FLUSH
void mm_free_global_asid(struct mm_struct *mm)
{
if (!cpu_feature_enabled(X86_FEATURE_INVLPGB))
@ -412,13 +413,12 @@ void mm_free_global_asid(struct mm_struct *mm)
guard(raw_spinlock_irqsave)(&global_asid_lock);
/* The global ASID can be re-used only after flush at wrap-around. */
#ifdef CONFIG_BROADCAST_TLB_FLUSH
__set_bit(mm->context.global_asid, global_asid_freed);
mm->context.global_asid = 0;
global_asid_available++;
#endif
}
#endif
/*
* Is the mm transitioning from a CPU-local ASID to a global ASID?