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-rw-r--r--include/sys/mman.h12
1 files changed, 10 insertions, 2 deletions
diff --git a/include/sys/mman.h b/include/sys/mman.h
index 10f4afe24..76c2009bf 100644
--- a/include/sys/mman.h
+++ b/include/sys/mman.h
@@ -81,6 +81,8 @@ extern int munmap (void *__addr, size_t __len) __THROW;
(and sets errno). */
extern int mprotect (void *__addr, size_t __len, int __prot) __THROW;
+#ifdef __ARCH_USE_MMU__
+
/* Synchronize the region starting at ADDR and extending LEN bytes with the
file it maps. Filesystem operations on a file being mapped are
unpredictable before this is done. Flags are from the MS_* set.
@@ -89,6 +91,13 @@ extern int mprotect (void *__addr, size_t __len, int __prot) __THROW;
__THROW. */
extern int msync (void *__addr, size_t __len, int __flags);
+#else
+
+/* On no-mmu systems you can't have real private mappings. */
+static inline int msync (void *__addr, size_t __len, int __flags) { return 0; }
+
+#endif
+
#ifdef __USE_BSD
/* Advise the system about particular usage patterns the program follows
for the region starting at ADDR and extending LEN bytes. */
@@ -120,8 +129,7 @@ extern int munlockall (void) __THROW;
#else
/* On no-mmu systems, memory cannot be swapped out, so
- * these functions will always succeed.
- */
+ * these functions will always succeed. */
static inline int mlock (__const void *__addr, size_t __len) { return 0; }
static inline int munlock (__const void *__addr, size_t __len) { return 0; }
static inline int mlockall (int __flags) { return 0; }