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path: root/kernel/user-return-notifier.c
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2009-12-02core: Clean up user return notifers use of per_cpuAvi Kivity
Instead of using per_cpu(..., raw_smp_processor_id()), use __get_cpu_var(...). Signed-off-by: Avi Kivity <avi@redhat.com> LKML-Reference: <1259578491-4589-1-git-send-email-avi@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-11-02x86: Fix user return notifier put_cpu_var() invocationStephen Rothwell
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 7c68af6e32c73992bad24107311f3433c89016e2 ("core, x86: Add user return notifiers") from the tip and kvm trees but revealed by commit e0fdb0e050eae331046385643618f12452aa7e73 ("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: Stephen 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: Ingo Molnar <mingo@elte.hu>
2009-10-01core, x86: Add user return notifiersAvi Kivity
Add a general per-cpu notifier that is called whenever the kernel is about to return to userspace. The notifier uses a thread_info flag and existing checks, so there is no impact on user return or context switch fast paths. This will be used initially to speed up KVM task switching by lazily updating MSRs. Signed-off-by: Avi Kivity <avi@redhat.com> LKML-Reference: <1253342422-13811-1-git-send-email-avi@redhat.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>