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McKenney" To: linux-kernel@vger.kernel.org Cc: 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" Subject: [PATCH tip/core/rcu 16/19] rcu: Eliminate rcu_state structure's ->call field Date: Wed, 29 Aug 2018 15:20:44 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180829222021.GA29944@linux.vnet.ibm.com> References: <20180829222021.GA29944@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18082922-0068-0000-0000-00000331B7B8 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009636; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01080738; UDB=6.00557494; IPR=6.00860723; MB=3.00023001; MTD=3.00000008; XFM=3.00000015; UTC=2018-08-29 22:20:55 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18082922-0069-0000-0000-0000458F0E19 Message-Id: <20180829222047.319-16-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-08-29_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 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=8.0.1-1807170000 definitions=main-1808290217 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The rcu_state structure's ->call field references the corresponding RCU flavor's call_rcu() function. However, now that there is only ever one rcu_state structure in a given build of the Linux kernel, and that flavor uses plain old call_rcu(), there is not a lot of point in continuing to have the ->call field. This commit therefore removes it. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 1 - kernel/rcu/tree.h | 1 - kernel/rcu/tree_exp.h | 2 +- 3 files changed, 1 insertion(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 1868df8089ba..0c736e078fe6 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -76,7 +76,6 @@ static DEFINE_PER_CPU_SHARED_ALIGNED(struct rcu_data, rcu_data); struct rcu_state rcu_state = { .level = { &rcu_state.node[0] }, .rda = &rcu_data, - .call = call_rcu, .gp_state = RCU_GP_IDLE, .gp_seq = (0UL - 300UL) << RCU_SEQ_CTR_SHIFT, .barrier_mutex = __MUTEX_INITIALIZER(rcu_state.barrier_mutex), diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 3f36562d3118..c50060567146 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -313,7 +313,6 @@ struct rcu_state { /* Hierarchy levels (+1 to */ /* shut bogus gcc warning) */ struct rcu_data __percpu *rda; /* pointer of percu rcu_data. */ - call_rcu_func_t call; /* call_rcu() flavor. */ int ncpus; /* # CPUs seen so far. */ /* The following fields are guarded by the root rcu_node's lock. */ diff --git a/kernel/rcu/tree_exp.h b/kernel/rcu/tree_exp.h index 5619edfd414e..224f05f0c0c9 100644 --- a/kernel/rcu/tree_exp.h +++ b/kernel/rcu/tree_exp.h @@ -619,7 +619,7 @@ static void _synchronize_rcu_expedited(struct rcu_state *rsp, /* If expedited grace periods are prohibited, fall back to normal. */ if (rcu_gp_is_normal()) { - wait_rcu_gp(rsp->call); + wait_rcu_gp(call_rcu); return; } -- 2.17.1