Merge branch 'keys-devel' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull crypto key patches from David Howells:
 "There are four items:

   - A patch to fix X.509 certificate gathering.  The problem was that I
     was coming up with a different path for signing_key.x509 in the
     build directory if it didn't exist to if it did exist.  This meant
     that the X.509 cert container object file would be rebuilt on the
     second rebuild in a build directory and the kernel would get
     relinked.

   - Unconditionally remove files generated by SYSTEM_TRUSTED_KEYRING=y
     when doing make mrproper.

   - Actually initialise the persistent-keyring semaphore for
     init_user_ns.  I have no idea why this works at all for users in
     the base user namespace unless it's something to do with systemd
     containerising the system.

   - Documentation for module signing"

* 'keys-devel' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  Add Documentation/module-signing.txt file
  KEYS: fix uninitialized persistent_keyring_register_sem
  KEYS: Remove files generated when SYSTEM_TRUSTED_KEYRING=y
  X.509: Fix certificate gathering

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