mm: mmap: add new /proc tunable for mmap_base ASLR

[deliverable/linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 00bad7793788b2fb3342bda26335fc0713f0e909..d396753c0577f05b131a51688a90ebf899bfa9d3 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -51,6 +51,17 @@ extern int sysctl_legacy_va_layout;
 #define sysctl_legacy_va_layout 0
 #endif
 
+#ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
+extern const int mmap_rnd_bits_min;
+extern const int mmap_rnd_bits_max;
+extern int mmap_rnd_bits __read_mostly;
+#endif
+#ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
+extern const int mmap_rnd_compat_bits_min;
+extern const int mmap_rnd_compat_bits_max;
+extern int mmap_rnd_compat_bits __read_mostly;
+#endif
+
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -1361,10 +1372,26 @@ static inline void dec_mm_counter(struct mm_struct *mm, int member)
        atomic_long_dec(&mm->rss_stat.count[member]);
 }
 
+/* Optimized variant when page is already known not to be PageAnon */
+static inline int mm_counter_file(struct page *page)
+{
+       if (PageSwapBacked(page))
+               return MM_SHMEMPAGES;
+       return MM_FILEPAGES;
+}
+
+static inline int mm_counter(struct page *page)
+{
+       if (PageAnon(page))
+               return MM_ANONPAGES;
+       return mm_counter_file(page);
+}
+
 static inline unsigned long get_mm_rss(struct mm_struct *mm)
 {
        return get_mm_counter(mm, MM_FILEPAGES) +
-               get_mm_counter(mm, MM_ANONPAGES);
+               get_mm_counter(mm, MM_ANONPAGES) +
+               get_mm_counter(mm, MM_SHMEMPAGES);
 }
 
 static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm)