unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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x86: paravirt spinlocks, !CONFIG_SMP build fixes

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Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-07-09 14:33:33 +02:00
parent 2d9e1e2f58
commit 4bb689eee1
2 changed files with 8 additions and 0 deletions
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4
arch/x86/kernel/paravirt.c
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@ -270,11 +270,13 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
void __init paravirt_use_bytelocks(void) void __init paravirt_use_bytelocks(void)
{ {
#ifdef CONFIG_SMP
pv_lock_ops.spin_is_locked = __byte_spin_is_locked; pv_lock_ops.spin_is_locked = __byte_spin_is_locked;
pv_lock_ops.spin_is_contended = __byte_spin_is_contended; pv_lock_ops.spin_is_contended = __byte_spin_is_contended;
pv_lock_ops.spin_lock = __byte_spin_lock; pv_lock_ops.spin_lock = __byte_spin_lock;
pv_lock_ops.spin_trylock = __byte_spin_trylock; pv_lock_ops.spin_trylock = __byte_spin_trylock;
pv_lock_ops.spin_unlock = __byte_spin_unlock; pv_lock_ops.spin_unlock = __byte_spin_unlock;
#endif
} }
struct pv_info pv_info = { struct pv_info pv_info = {
@ -461,12 +463,14 @@ struct pv_mmu_ops pv_mmu_ops = {
}; };
struct pv_lock_ops pv_lock_ops = { struct pv_lock_ops pv_lock_ops = {
#ifdef CONFIG_SMP
.spin_is_locked = __ticket_spin_is_locked, .spin_is_locked = __ticket_spin_is_locked,
.spin_is_contended = __ticket_spin_is_contended, .spin_is_contended = __ticket_spin_is_contended,
.spin_lock = __ticket_spin_lock, .spin_lock = __ticket_spin_lock,
.spin_trylock = __ticket_spin_trylock, .spin_trylock = __ticket_spin_trylock,
.spin_unlock = __ticket_spin_unlock, .spin_unlock = __ticket_spin_unlock,
#endif
}; };
EXPORT_SYMBOL_GPL(pv_time_ops); EXPORT_SYMBOL_GPL(pv_time_ops);

4
include/asm-x86/paravirt.h
View file

@ -1387,6 +1387,8 @@ void _paravirt_nop(void);
void paravirt_use_bytelocks(void); void paravirt_use_bytelocks(void);
#ifdef CONFIG_SMP
static inline int __raw_spin_is_locked(struct raw_spinlock *lock) static inline int __raw_spin_is_locked(struct raw_spinlock *lock)
{ {
return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock); return PVOP_CALL1(int, pv_lock_ops.spin_is_locked, lock);
@ -1412,6 +1414,8 @@ static __always_inline void __raw_spin_unlock(struct raw_spinlock *lock)
return PVOP_VCALL1(pv_lock_ops.spin_unlock, lock); return PVOP_VCALL1(pv_lock_ops.spin_unlock, lock);
} }
#endif
/* These all sit in the .parainstructions section to tell us what to patch. */ /* These all sit in the .parainstructions section to tell us what to patch. */
struct paravirt_patch_site { struct paravirt_patch_site {
u8 *instr; /* original instructions */ u8 *instr; /* original instructions */