cregit-Linux how code gets into the kernel

Release 4.7 include/linux/page_ref.h

Directory: include/linux
#ifndef _LINUX_PAGE_REF_H

#define _LINUX_PAGE_REF_H

#include <linux/atomic.h>
#include <linux/mm_types.h>
#include <linux/page-flags.h>
#include <linux/tracepoint-defs.h>

extern struct tracepoint __tracepoint_page_ref_set;
extern struct tracepoint __tracepoint_page_ref_mod;
extern struct tracepoint __tracepoint_page_ref_mod_and_test;
extern struct tracepoint __tracepoint_page_ref_mod_and_return;
extern struct tracepoint __tracepoint_page_ref_mod_unless;
extern struct tracepoint __tracepoint_page_ref_freeze;
extern struct tracepoint __tracepoint_page_ref_unfreeze;

#ifdef CONFIG_DEBUG_PAGE_REF

/*
 * Ideally we would want to use the trace_<tracepoint>_enabled() helper
 * functions. But due to include header file issues, that is not
 * feasible. Instead we have to open code the static key functions.
 *
 * See trace_##name##_enabled(void) in include/linux/tracepoint.h
 */

#define page_ref_tracepoint_active(t) static_key_false(&(t).key)

extern void __page_ref_set(struct page *page, int v);
extern void __page_ref_mod(struct page *page, int v);
extern void __page_ref_mod_and_test(struct page *page, int v, int ret);
extern void __page_ref_mod_and_return(struct page *page, int v, int ret);
extern void __page_ref_mod_unless(struct page *page, int v, int u);
extern void __page_ref_freeze(struct page *page, int v, int ret);
extern void __page_ref_unfreeze(struct page *page, int v);

#else


#define page_ref_tracepoint_active(t) false


static inline void __page_ref_set(struct page *page, int v) { }

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static inline void __page_ref_mod(struct page *page, int v) { }

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static inline void __page_ref_mod_and_test(struct page *page, int v, int ret) { }

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static inline void __page_ref_mod_and_return(struct page *page, int v, int ret) { }

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static inline void __page_ref_mod_unless(struct page *page, int v, int u) { }

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static inline void __page_ref_freeze(struct page *page, int v, int ret) { }

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static inline void __page_ref_unfreeze(struct page *page, int v) { }

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#endif
static inline int page_ref_count(struct page *page) { return atomic_read(&page->_refcount); }

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static inline int page_count(struct page *page) { return atomic_read(&compound_head(page)->_refcount); }

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static inline void set_page_count(struct page *page, int v) { atomic_set(&page->_refcount, v); if (page_ref_tracepoint_active(__tracepoint_page_ref_set)) __page_ref_set(page, v); }

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/* * Setup the page count before being freed into the page allocator for * the first time (boot or memory hotplug) */
static inline void init_page_count(struct page *page) { set_page_count(page, 1); }

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static inline void page_ref_add(struct page *page, int nr) { atomic_add(nr, &page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod)) __page_ref_mod(page, nr); }

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static inline void page_ref_sub(struct page *page, int nr) { atomic_sub(nr, &page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod)) __page_ref_mod(page, -nr); }

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static inline void page_ref_inc(struct page *page) { atomic_inc(&page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod)) __page_ref_mod(page, 1); }

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static inline void page_ref_dec(struct page *page) { atomic_dec(&page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod)) __page_ref_mod(page, -1); }

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static inline int page_ref_sub_and_test(struct page *page, int nr) { int ret = atomic_sub_and_test(nr, &page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_test)) __page_ref_mod_and_test(page, -nr, ret); return ret; }

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static inline int page_ref_dec_and_test(struct page *page) { int ret = atomic_dec_and_test(&page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_test)) __page_ref_mod_and_test(page, -1, ret); return ret; }

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static inline int page_ref_dec_return(struct page *page) { int ret = atomic_dec_return(&page->_refcount); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_and_return)) __page_ref_mod_and_return(page, -1, ret); return ret; }

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static inline int page_ref_add_unless(struct page *page, int nr, int u) { int ret = atomic_add_unless(&page->_refcount, nr, u); if (page_ref_tracepoint_active(__tracepoint_page_ref_mod_unless)) __page_ref_mod_unless(page, nr, ret); return ret; }

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static inline int page_ref_freeze(struct page *page, int count) { int ret = likely(atomic_cmpxchg(&page->_refcount, count, 0) == count); if (page_ref_tracepoint_active(__tracepoint_page_ref_freeze)) __page_ref_freeze(page, count, ret); return ret; }

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static inline void page_ref_unfreeze(struct page *page, int count) { VM_BUG_ON_PAGE(page_count(page) != 0, page); VM_BUG_ON(count == 0); atomic_set(&page->_refcount, count); if (page_ref_tracepoint_active(__tracepoint_page_ref_unfreeze)) __page_ref_unfreeze(page, count); }

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#endif

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Directory: include/linux
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