aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/Kconfig
diff options
context:
space:
mode:
authorAvi Kivity <avi@redhat.com>2009-09-19 09:40:22 +0300
committerH. Peter Anvin <hpa@zytor.com>2009-10-01 12:12:18 -0700
commit7c68af6e32c73992bad24107311f3433c89016e2 (patch)
tree9046ac5339f944e8ddccd34be226790b953dda61 /arch/x86/Kconfig
parent817b33d38f81c8736d39283c35c886ae4668f1af (diff)
core, x86: Add user return notifiers
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>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8da93745c08..1df175d15aa 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -50,6 +50,7 @@ config X86
select HAVE_KERNEL_BZIP2
select HAVE_KERNEL_LZMA
select HAVE_ARCH_KMEMCHECK
+ select HAVE_USER_RETURN_NOTIFIER
config OUTPUT_FORMAT
string