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Hide the internals of vm_page_lock(9) from the loadable modules.

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Since the address of vm_page lock mutex depends on the kernel options,
it is easy for module to get out of sync with the kernel.

No vm_page_lockptr() accessor is provided for modules. It can be added
later if needed, unless proper KPI is developed to serve the needs.

Reviewed by:	attilio, alc
MFC after:	3 weeks
This commit is contained in:
Konstantin Belousov 2011-11-29 13:07:32 +00:00
parent 3e47c78798
commit cf1911a9ad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228133
2 changed files with 49 additions and 0 deletions
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30
sys/vm/vm_page.c
View File

@ -2843,6 +2843,36 @@ vm_page_test_dirty(vm_page_t m)
vm_page_dirty(m);
}
void
vm_page_lock_KBI(vm_page_t m, const char *file, int line)
{
mtx_lock_flags_(vm_page_lockptr(m), 0, file, line);
}
void
vm_page_unlock_KBI(vm_page_t m, const char *file, int line)
{
mtx_unlock_flags_(vm_page_lockptr(m), 0, file, line);
}
int
vm_page_trylock_KBI(vm_page_t m, const char *file, int line)
{
return (mtx_trylock_flags_(vm_page_lockptr(m), 0, file, line));
}
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
void
vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line)
{
mtx_assert_(vm_page_lockptr(m), a, file, line);
}
#endif
int so_zerocp_fullpage = 0;
/*

19
sys/vm/vm_page.h
View File

@ -218,11 +218,23 @@ extern struct vpglocks pa_lock[];
#define PA_LOCK_ASSERT(pa, a) mtx_assert(PA_LOCKPTR(pa), (a))
#ifdef KLD_MODULE
#define vm_page_lock(m) vm_page_lock_KBI((m), LOCK_FILE, LOCK_LINE)
#define vm_page_unlock(m) vm_page_unlock_KBI((m), LOCK_FILE, LOCK_LINE)
#define vm_page_trylock(m) vm_page_trylock_KBI((m), LOCK_FILE, LOCK_LINE)
#if defined(INVARIANTS)
#define vm_page_lock_assert(m, a) \
vm_page_lock_assert_KBI((m), (a), __FILE__, __LINE__)
#else
#define vm_page_lock_assert(m, a)
#endif
#else /* !KLD_MODULE */
#define vm_page_lockptr(m) (PA_LOCKPTR(VM_PAGE_TO_PHYS((m))))
#define vm_page_lock(m) mtx_lock(vm_page_lockptr((m)))
#define vm_page_unlock(m) mtx_unlock(vm_page_lockptr((m)))
#define vm_page_trylock(m) mtx_trylock(vm_page_lockptr((m)))
#define vm_page_lock_assert(m, a) mtx_assert(vm_page_lockptr((m)), (a))
#endif
#define vm_page_queue_free_mtx vm_page_queue_free_lock.data
/*
@ -405,6 +417,13 @@ void vm_page_cowfault (vm_page_t);
int vm_page_cowsetup(vm_page_t);
void vm_page_cowclear (vm_page_t);
void vm_page_lock_KBI(vm_page_t m, const char *file, int line);
void vm_page_unlock_KBI(vm_page_t m, const char *file, int line);
int vm_page_trylock_KBI(vm_page_t m, const char *file, int line);
#if defined(INVARIANTS) || defined(INVARIANT_SUPPORT)
void vm_page_lock_assert_KBI(vm_page_t m, int a, const char *file, int line);
#endif
#ifdef INVARIANTS
void vm_page_object_lock_assert(vm_page_t m);
#define VM_PAGE_OBJECT_LOCK_ASSERT(m) vm_page_object_lock_assert(m)