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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 24/27] rcu: Print stall-warning NMI dyntick state in hexadecimal Date: Mon, 25 Jun 2018 17:35:10 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180626003448.GA26209@linux.vnet.ibm.com> References: <20180626003448.GA26209@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18062600-2213-0000-0000-000002BFF458 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009255; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01052336; UDB=6.00539469; IPR=6.00830262; MB=3.00021856; MTD=3.00000008; XFM=3.00000015; UTC=2018-06-26 00:33:15 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18062600-2214-0000-0000-00005A9BB5D1 Message-Id: <20180626003513.27812-24-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-25_11:,, 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=996 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1806260005 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ->dynticks_nmi_nesting field records the nesting depth of both interrupt and NMI handlers. Because the kernel can enter interrupts and never leave them (and vice versa) and because NMIs can interrupt manipulation of the ->dynticks_nmi_nesting field, the values in this field must be both chosen and maniupated very carefully. As a result, although the value is zero when the corresponding CPU is executing neither an interrupt nor an NMI handler, it is 4,611,686,018,427,387,906 on 64-bit systems when there is a single level of interrupt/NMI handling in progress. This number is difficult to remember and interpret, so this commit switches the output to hexadecimal, resulting in the much nicer 0x4000000000000002. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_plugin.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 2cc9bf0d363a..c1b17f5b9361 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1801,7 +1801,7 @@ static void print_cpu_stall_info(struct rcu_state *rsp, int cpu) } print_cpu_stall_fast_no_hz(fast_no_hz, cpu); delta = rcu_seq_ctr(rdp->mynode->gp_seq - rdp->rcu_iw_gp_seq); - pr_err("\t%d-%c%c%c%c: (%lu %s) idle=%03x/%ld/%ld softirq=%u/%u fqs=%ld %s\n", + pr_err("\t%d-%c%c%c%c: (%lu %s) idle=%03x/%ld/%#lx softirq=%u/%u fqs=%ld %s\n", cpu, "O."[!!cpu_online(cpu)], "o."[!!(rdp->grpmask & rdp->mynode->qsmaskinit)], -- 2.17.1