etmem: add CONFIG_ETMEM macro definition for etmem feature

euleros inclusion
category: feature
eature: etmem
bugzilla: https://gitee.com/openeuler/kernel/issues/I5DC4A

-------------------------------------------------
add CONFIG_ETMEM macro definition for etmem feature.
Signed-off-by: Nliubo <liubo254@huawei.com>
Reviewed-by: NMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

fs/proc/base.c

@@ -3338,6 +3338,8 @@ static const struct pid_entry tgid_base_stuff[] = {
 	REG("smaps",      S_IRUGO, proc_pid_smaps_operations),
 	REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
 	REG("pagemap",    S_IRUSR, proc_pagemap_operations),
+#endif
+#ifdef CONFIG_ETMEM
 	REG("idle_pages", S_IRUSR|S_IWUSR, proc_mm_idle_operations),
 	REG("swap_pages", S_IWUSR, proc_mm_swap_operations),
 #endif
@@ -3689,6 +3691,8 @@ static const struct pid_entry tid_base_stuff[] = {
 	REG("smaps",     S_IRUGO, proc_pid_smaps_operations),
 	REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations),
 	REG("pagemap",    S_IRUSR, proc_pagemap_operations),
+#endif
+#ifdef CONFIG_ETMEM
 	REG("idle_pages", S_IRUSR|S_IWUSR, proc_mm_idle_operations),
 	REG("swap_pages", S_IWUSR, proc_mm_swap_operations),
 #endif

fs/proc/internal.h

@@ -304,8 +304,10 @@ extern const struct file_operations proc_pid_smaps_operations;
 extern const struct file_operations proc_pid_smaps_rollup_operations;
 extern const struct file_operations proc_clear_refs_operations;
 extern const struct file_operations proc_pagemap_operations;
+#ifdef CONFIG_ETMEM
 extern const struct file_operations proc_mm_idle_operations;
 extern const struct file_operations proc_mm_swap_operations;
+#endif
 
 extern unsigned long task_vsize(struct mm_struct *);
 extern unsigned long task_statm(struct mm_struct *,

fs/proc/task_mmu.c

@@ -1855,6 +1855,7 @@ const struct file_operations proc_pagemap_operations = {
 	.release	= pagemap_release,
 };
 
+#ifdef CONFIG_ETMEM
 static DEFINE_SPINLOCK(scan_lock);
 
 static int page_scan_lock(struct file *file, int is_lock, struct file_lock *flock)
@@ -2037,6 +2038,7 @@ const struct file_operations proc_mm_swap_operations = {
 	.open       = mm_swap_open,
 	.release    = mm_swap_release,
 };
+#endif
 #endif /* CONFIG_PROC_PAGE_MONITOR */
 
 #ifdef CONFIG_NUMA

include/linux/swap.h

@@ -383,9 +383,11 @@ extern int vm_swappiness;
 extern int remove_mapping(struct address_space *mapping, struct page *page);
 
 extern unsigned long reclaim_pages(struct list_head *page_list);
+#ifdef CONFIG_ETMEM
 extern int add_page_for_swap(struct page *page, struct list_head *pagelist);
 extern struct page *get_page_from_vaddr(struct mm_struct *mm,
 					unsigned long vaddr);
+#endif
 #ifdef CONFIG_NUMA
 extern int node_reclaim_mode;
 extern int sysctl_min_unmapped_ratio;

mm/vmscan.c

@@ -4582,6 +4582,7 @@ void check_move_unevictable_pages(struct pagevec *pvec)
 }
 EXPORT_SYMBOL_GPL(check_move_unevictable_pages);
 
+#ifdef CONFIG_ETMEM
 int add_page_for_swap(struct page *page, struct list_head *pagelist)
 {
 	int err = -EBUSY;
@@ -4636,3 +4637,4 @@ struct page *get_page_from_vaddr(struct mm_struct *mm, unsigned long vaddr)
 	return page;
 }
 EXPORT_SYMBOL_GPL(get_page_from_vaddr);
+#endif