[qemu-xen master] Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' into staging

[patchbot@xxxxxxx]

commit 1448629751871c4924c234c2faaa968fc26890e1
Merge: 5772f2b1fc5d00e7e04e01fa28e9081d6550440a 
000822441e34916991f7c03217dc24f38be49e50
Author:     Peter Maydell <peter.maydell@xxxxxxxxxx>
AuthorDate: Thu Jul 30 20:02:26 2020 +0100
Commit:     Peter Maydell <peter.maydell@xxxxxxxxxx>
CommitDate: Thu Jul 30 20:02:26 2020 +0100

    Merge remote-tracking branch 'remotes/stefanha/tags/tracing-pull-request' 
into staging
    
    Pull request
    
    A build fix and a 'simple' trace backend regression fix.
    
    # gpg: Signature made Thu 30 Jul 2020 19:13:10 BST
    # gpg:                using RSA key 8695A8BFD3F97CDAAC35775A9CA4ABB381AB73C8
    # gpg: Good signature from "Stefan Hajnoczi <stefanha@xxxxxxxxxx>" [full]
    # gpg:                 aka "Stefan Hajnoczi <stefanha@xxxxxxxxx>" [full]
    # Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35  775A 9CA4 ABB3 81AB 
73C8
    
    * remotes/stefanha/tags/tracing-pull-request:
      tracetool: carefully define SDT_USE_VARIADIC
      trace/simple: Allow enabling simple traces from command line
    
    Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>

 scripts/tracetool/backend/dtrace.py | 4 ++++
 trace/control.c                     | 1 +
 2 files changed, 5 insertions(+)
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#master