Merge git://git.infradead.org/users/eparis/audit

[cascardo/linux.git] / mm / util.c

diff --git a/mm/util.c b/mm/util.c
index 43b4419..f380af7 100644 (file)
--- a/mm/util.c
+++ b/mm/util.c
@@ -1,6 +1,7 @@
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/compiler.h>
 #include <linux/export.h>
 #include <linux/err.h>
 #include <linux/sched.h>
@@ -307,7 +308,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
  * If the architecture not support this function, simply return with no
  * page pinned
  */
-int __attribute__((weak)) __get_user_pages_fast(unsigned long start,
+int __weak __get_user_pages_fast(unsigned long start,
                                 int nr_pages, int write, struct page **pages)
 {
        return 0;
@@ -338,7 +339,7 @@ EXPORT_SYMBOL_GPL(__get_user_pages_fast);
  * callers need to carefully consider what to use. On many architectures,
  * get_user_pages_fast simply falls back to get_user_pages.
  */
-int __attribute__((weak)) get_user_pages_fast(unsigned long start,
+int __weak get_user_pages_fast(unsigned long start,
                                int nr_pages, int write, struct page **pages)
 {
        struct mm_struct *mm = current->mm;
@@ -404,13 +405,45 @@ struct address_space *page_mapping(struct page *page)
        return mapping;
 }
 
+int overcommit_ratio_handler(struct ctl_table *table, int write,
+                            void __user *buffer, size_t *lenp,
+                            loff_t *ppos)
+{
+       int ret;
+
+       ret = proc_dointvec(table, write, buffer, lenp, ppos);
+       if (ret == 0 && write)
+               sysctl_overcommit_kbytes = 0;
+       return ret;
+}
+
+int overcommit_kbytes_handler(struct ctl_table *table, int write,
+                            void __user *buffer, size_t *lenp,
+                            loff_t *ppos)
+{
+       int ret;
+
+       ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
+       if (ret == 0 && write)
+               sysctl_overcommit_ratio = 0;
+       return ret;
+}
+
 /*
  * Committed memory limit enforced when OVERCOMMIT_NEVER policy is used
  */
 unsigned long vm_commit_limit(void)
 {
-       return ((totalram_pages - hugetlb_total_pages())
-               * sysctl_overcommit_ratio / 100) + total_swap_pages;
+       unsigned long allowed;
+
+       if (sysctl_overcommit_kbytes)
+               allowed = sysctl_overcommit_kbytes >> (PAGE_SHIFT - 10);
+       else
+               allowed = ((totalram_pages - hugetlb_total_pages())
+                          * sysctl_overcommit_ratio / 100);
+       allowed += total_swap_pages;
+
+       return allowed;
 }
 
 /**