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Date: Mon, 21 Apr 2014 15:25:58 +0200 From: Oleg Nesterov <oleg@...hat.com> To: Avi Kivity <avi.kivity@...il.com>, Gleb Natapov <gleb@...nel.org>, Paolo Bonzini <pbonzini@...hat.com> Cc: Dominik Dingel <dingel@...ux.vnet.ibm.com>, Christian Borntraeger <borntraeger@...ibm.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/2] KVM: async_pf: kill the unnecessary use_mm/unuse_mm async_pf_execute() async_pf_execute() has no reasons to adopt apf->mm, gup(current, mm) should work just fine even if current has another or NULL ->mm. Recently kvm_async_page_present_sync() was added insedie the "use_mm" section, but it seems that it doesn't need current->mm too. Signed-off-by: Oleg Nesterov <oleg@...hat.com> --- virt/kvm/async_pf.c | 2 -- 1 files changed, 0 insertions(+), 2 deletions(-) diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c index 10df100..0ced4f3 100644 --- a/virt/kvm/async_pf.c +++ b/virt/kvm/async_pf.c @@ -80,12 +80,10 @@ static void async_pf_execute(struct work_struct *work) might_sleep(); - use_mm(mm); down_read(&mm->mmap_sem); get_user_pages(current, mm, addr, 1, 1, 0, NULL, NULL); up_read(&mm->mmap_sem); kvm_async_page_present_sync(vcpu, apf); - unuse_mm(mm); spin_lock(&vcpu->async_pf.lock); list_add_tail(&apf->link, &vcpu->async_pf.done); -- 1.5.5.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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