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userfaultfd: provide pid in userfault msg - add feat union

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No ABI change, but this will make it more explicit to software that ptid
is only available if requested by passing UFFD_FEATURE_THREAD_ID to
UFFDIO_API.  The fact it's a union will also self document it shouldn't
be taken for granted there's a tpid there.

Link: http://lkml.kernel.org/r/20170802165145.22628-7-aarcange@redhat.com
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Alexey Perevalov <a.perevalov@samsung.com>
Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrea Arcangeli 2017-09-06 16:23:59 -07:00 committed by Linus Torvalds
parent 9d4ac93482
commit a36985d31a
2 changed files with 4 additions and 2 deletions
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2
fs/userfaultfd.c
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@ -204,7 +204,7 @@ static inline struct uffd_msg userfault_msg(unsigned long address,
*/
msg.arg.pagefault.flags |= UFFD_PAGEFAULT_FLAG_WP;
if (features & UFFD_FEATURE_THREAD_ID)
msg.arg.pagefault.ptid = task_pid_vnr(current);
msg.arg.pagefault.feat.ptid = task_pid_vnr(current);
return msg;
}

4
include/uapi/linux/userfaultfd.h
View File

@ -80,7 +80,9 @@ struct uffd_msg {
struct {
__u64 flags;
__u64 address;
__u32 ptid;
union {
__u32 ptid;
} feat;
} pagefault;
struct {