[Qemu-devel] [PATCH v2 1/3] linux-user/mmap.c: Set prot page flags for the correct region in mmap_frag()

[chengang]

From: Chen Gang <address@hidden>

mmap() size in mmap_frag() is qemu_host_page_size, but the outside calls
page_set_flags() may be not with qemu_host_page_size. So after mmap(),
call page_set_flags() in time.

After this fix,  for the next call for the same region, prot1 will be
PAGE_VALID (not 0), so can avoid to enter "if (prot1 == 0)" case, again.

Signed-off-by: Chen Gang <address@hidden>
---
 linux-user/mmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 445e8c6..7807ed0 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -162,6 +162,8 @@ static int mmap_frag(abi_ulong real_start,
                        flags | MAP_ANONYMOUS, -1, 0);
         if (p == MAP_FAILED)
             return -1;
+        page_set_flags(real_start, real_start + qemu_host_page_size,
+                       PAGE_VALID);
         prot1 = prot;
     }
     prot1 &= PAGE_BITS;
-- 
1.9.1