linux-kernel - [PATCH 3/3] arch/s390/kvm: Use GFP

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Date:	Sun, 30 May 2010 22:28:14 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Carsten Otte <cotte@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	linux390@...ibm.com, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 3/3] arch/s390/kvm: Use GFP_ATOMIC when a lock is held

From: Julia Lawall <julia@...u.dk>

The containing function is called from several places.  At one of them, in
the function __sigp_stop, the spin lock &fi->lock is held.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@gfp exists@
identifier fn;
position p;
@@

fn(...) {
... when != spin_unlock
    when any
  GFP_KERNEL@p
 ... when any
}

@locked@
identifier gfp.fn;
@@

spin_lock(...)
... when != spin_unlock
fn(...)

@depends on locked@
position gfp.p;
@@

- GFP_KERNEL@p
+ GFP_ATOMIC
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 arch/s390/kvm/sigp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/arch/s390/kvm/sigp.c b/arch/s390/kvm/sigp.c
--- a/arch/s390/kvm/sigp.c
+++ b/arch/s390/kvm/sigp.c
@@ -113,7 +113,7 @@ static int __inject_sigp_stop(struct kvm
 {
 	struct kvm_s390_interrupt_info *inti;
 
-	inti = kzalloc(sizeof(*inti), GFP_KERNEL);
+	inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
 	if (!inti)
 		return -ENOMEM;
 	inti->type = KVM_S390_SIGP_STOP;
--
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