If you are having hard time to find the definition of PageSlab() in linux kernel, here’s the answer.
In include/linux/page-flags.h:
#define __PAGEFLAG(uname, lname) TESTPAGEFLAG(uname, lname) \
__SETPAGEFLAG(uname, lname) __CLEARPAGEFLAG(uname, lname)
#define TESTPAGEFLAG(uname, lname) \
static inline int Page##uname(const struct page *page) \
{ return test_bit(PG_##lname, &page->flags); }
#define __SETPAGEFLAG(uname, lname) \
static inline void __SetPage##uname(struct page *page) \
{ __set_bit(PG_##lname, &page->flags); }
#define __CLEARPAGEFLAG(uname, lname) \
static inline void __ClearPage##uname(struct page *page) \
{ __clear_bit(PG_##lname, &page->flags); }
__PAGEFLAG(Slab, slab)
Above becomes like below during compile time.
static inline int PageSlab(const struct page *page) {
return test_bit(PG_slab, &page->flags);
}
static inline void __SetPageSlab(struct page *page) {
__set_bit(PG_slab, &page->flags);
}
static inline void __ClearPageSlab(struct page *page) {
__clear_bit(PG_slab, &page->flags);
}
Sungju's Slow Life 
Leave a Reply