tree 20a5a2f01fdb6304e23d51663e0f926d0c25ac11
parent 3d8dcb3c76bb2930798f61675c33cce8945ab988
author Martin Schwidefsky <schwidefsky@de.ibm.com> 1305040423 +0200
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1305040423 +0200

[S390] fix alloc_pgste check in init_new_context

Processes started with kernel_execve from a kernel thread will have
current->mm==NULL. Reading current->mm->context.alloc_pgste will
read a more or less random bit from lowcore in this case. If the
bit turns out to be set the whole process tree started this way
will allocate page table extensions although they have no need
for it.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>