From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: [PATCH RT 6/7] net: Use cpu_chill() instead of cpu_relax() Date: Tue, 13 Mar 2012 22:27:04 -0400 Message-ID: <20120314022945.771027206@goodmis.org> References: <20120314022658.783312660@goodmis.org> Cc: Thomas Gleixner , Carsten Emde , John Kacur , stable-rt@vger.kernel.org To: linux-kernel@vger.kernel.org, linux-rt-users Return-path: Content-Disposition: inline; filename=0006-net-Use-cpu_chill-instead-of-cpu_relax.patch Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org From: Thomas Gleixner Retry loops on RT might loop forever when the modifying side was preempted. Use cpu_chill() instead of cpu_relax() to let the system make progress. Signed-off-by: Thomas Gleixner Cc: stable-rt@vger.kernel.org Signed-off-by: Steven Rostedt --- net/rds/ib_rdma.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index 819c35a..256ad87 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -33,6 +33,7 @@ #include #include #include +#include #include "rds.h" #include "ib.h" @@ -294,7 +295,7 @@ static inline void wait_clean_list_grace(void) for_each_online_cpu(cpu) { flag = &per_cpu(clean_list_grace, cpu); while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) - cpu_relax(); + cpu_chill(); } } -- 1.7.8.3