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McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" , "Naveen N. Rao" , Anil S Keshavamurthy , "David S. Miller" , Masami Hiramatsu , Jonathan Corbet , linux-doc@vger.kernel.org Subject: [PATCH tip/core/rcu 1/2] doc/kprobes: Update obsolete RCU update functions Date: Tue, 26 Mar 2019 16:00:49 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190326230011.GA16275@linux.ibm.com> References: <20190326230011.GA16275@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19032623-0052-0000-0000-000003A1863D X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010820; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000282; SDB=6.01180128; UDB=6.00617570; IPR=6.00960844; MB=3.00026169; MTD=3.00000008; XFM=3.00000015; UTC=2019-03-26 23:00:57 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19032623-0053-0000-0000-00006048D094 Message-Id: <20190326230050.16840-1-paulmck@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-03-26_15:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=13 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1903260154 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The RCU flavors have been consolidated, so this commit replaces mentions of the now-obsolete synchronize_sched() function with synchronize_rcu(). Signed-off-by: Paul E. McKenney Cc: "Naveen N. Rao" Cc: Anil S Keshavamurthy Cc: "David S. Miller" Cc: Masami Hiramatsu Cc: Jonathan Corbet Cc: --- Documentation/kprobes.txt | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt index 10f4499e677c..ee60e519438a 100644 --- a/Documentation/kprobes.txt +++ b/Documentation/kprobes.txt @@ -243,10 +243,10 @@ Optimization ^^^^^^^^^^^^ The Kprobe-optimizer doesn't insert the jump instruction immediately; -rather, it calls synchronize_sched() for safety first, because it's +rather, it calls synchronize_rcu() for safety first, because it's possible for a CPU to be interrupted in the middle of executing the -optimized region [3]_. As you know, synchronize_sched() can ensure -that all interruptions that were active when synchronize_sched() +optimized region [3]_. As you know, synchronize_rcu() can ensure +that all interruptions that were active when synchronize_rcu() was called are done, but only if CONFIG_PREEMPT=n. So, this version of kprobe optimization supports only kernels with CONFIG_PREEMPT=n [4]_. -- 2.17.1