microblaze: Fix bug with mmap2 syscall MB implementation

Fix mmap2 behaviour which incorrectly works with pgoff
not in 4k units.

Reported-by: Rich Felker <dalias@aerifal.cx>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c
index e80a6c0..f1e1f66 100644 (file)
--- a/arch/microblaze/kernel/sys_microblaze.c
+++ b/arch/microblaze/kernel/sys_microblaze.c
@@ -42,3 +42,14 @@ SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len,
 
        return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
 }
+
+SYSCALL_DEFINE6(mmap2, unsigned long, addr, unsigned long, len,
+               unsigned long, prot, unsigned long, flags, unsigned long, fd,
+               unsigned long, pgoff)
+{
+       if (pgoff & (~PAGE_MASK >> 12))
+               return -EINVAL;
+
+       return sys_mmap_pgoff(addr, len, prot, flags, fd,
+                             pgoff >> (PAGE_SHIFT - 12));
+}

diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S
index 4fca56c..b882ad5 100644 (file)
--- a/arch/microblaze/kernel/syscall_table.S
+++ b/arch/microblaze/kernel/syscall_table.S
@@ -192,7 +192,7 @@ ENTRY(sys_call_table)
        .long sys_ni_syscall            /* reserved for streams2 */
        .long sys_vfork         /* 190 */
        .long sys_getrlimit
-       .long sys_mmap_pgoff            /* mmap2 */
+       .long sys_mmap2
        .long sys_truncate64
        .long sys_ftruncate64
        .long sys_stat64                /* 195 */