x86/boot/32: Rewrite test_wp_bit()

[linux-2.6-microblaze.git] / ipc / shm.c

diff --git a/ipc/shm.c b/ipc/shm.c
index d7805ac..481d2a9 100644 (file)
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -423,7 +423,7 @@ static int shm_mmap(struct file *file, struct vm_area_struct *vma)
        if (ret)
                return ret;
 
-       ret = sfd->file->f_op->mmap(sfd->file, vma);
+       ret = call_mmap(sfd->file, vma);
        if (ret) {
                shm_close(vma);
                return ret;
@@ -452,7 +452,7 @@ static int shm_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 
        if (!sfd->file->f_op->fsync)
                return -EINVAL;
-       return sfd->file->f_op->fsync(sfd->file, start, end, datasync);
+       return call_fsync(sfd->file, start, end, datasync);
 }
 
 static long shm_fallocate(struct file *file, int mode, loff_t offset,
@@ -1091,8 +1091,8 @@ out_unlock1:
  * "raddr" thing points to kernel space, and there has to be a wrapper around
  * this.
  */
-long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
-             unsigned long shmlba)
+long do_shmat(int shmid, char __user *shmaddr, int shmflg,
+             ulong *raddr, unsigned long shmlba)
 {
        struct shmid_kernel *shp;
        unsigned long addr;
@@ -1113,8 +1113,13 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
                goto out;
        else if ((addr = (ulong)shmaddr)) {
                if (addr & (shmlba - 1)) {
-                       if (shmflg & SHM_RND)
-                               addr &= ~(shmlba - 1);     /* round down */
+                       /*
+                        * Round down to the nearest multiple of shmlba.
+                        * For sane do_mmap_pgoff() parameters, avoid
+                        * round downs that trigger nil-page and MAP_FIXED.
+                        */
+                       if ((shmflg & SHM_RND) && addr >= shmlba)
+                               addr &= ~(shmlba - 1);
                        else
 #ifndef __ARCH_FORCE_SHMLBA
                                if (addr & ~PAGE_MASK)