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  1. 02 Dec, 2009 1 commit
  3. 29 Nov, 2009 1 commit
    • Avi Kivity's avatar
      core: Fix user return notifier on fork() · 8e7cac79
      Avi Kivity authored 
      fork() clones all thread_info flags, including
TIF_USER_RETURN_NOTIFY; if the new task is first scheduled on a cpu
which doesn't have user return notifiers set, this causes user
return notifiers to trigger without any way of clearing itself.

This is easy to trigger with a forky workload on the host in
parallel with kvm, resulting in a cpu in an endless loop on the
verge of returning to userspace.

Fix by dropping the TIF_USER_RETURN_NOTIFY immediately after fork.
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
LKML-Reference: <1259505288-16559-1-git-send-email-avi@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      8e7cac79
  5. 02 Nov, 2009 1 commit
    • Stephen Rothwell's avatar
      x86: Fix user return notifier put_cpu_var() invocation · 3c912b6e
      Stephen Rothwell authored 
      Today's linux-next build (x86_64 allmodconfig) failed like this:

  kernel/user-return-notifier.c: In function
  'fire_user_return_notifiers': kernel/user-return-notifier.c:45:
  error: expected expression before ')' token

Introduced by commit 7c68af6e
("core, x86: Add user return notifiers") from the tip and kvm trees
but revealed by commit e0fdb0e0
("percpu: add __percpu for sparse") from the percpu tree.

Before that percpu tree commit, "put_cpu_var()" would compile
without error (even though it really needs a parameter).
Signed-off-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Cc: Avi Kivity <avi@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Christoph Lameter <cl@linux-foundation.org>
LKML-Reference: <20091102161722.eea4358d.sfr@canb.auug.org.au>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      3c912b6e
  7. 25 Oct, 2009 1 commit
  9. 01 Oct, 2009 2 commits
  11. 30 Sep, 2009 34 commits