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[14.202.190.183]) by smtp.gmail.com with ESMTPSA id lt11sm5105005pjb.2.2020.03.20.08.27.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Mar 2020 08:27:12 -0700 (PDT) From: Nicholas Piggin To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH] powerpc/pseries: avoid harmless preempt warning Date: Sat, 21 Mar 2020 01:24:36 +1000 Message-Id: <20200320152436.1468651-1-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nicholas Piggin Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Signed-off-by: Nicholas Piggin --- arch/powerpc/platforms/pseries/lpar.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 3c3da25b445c..e4ed5317f117 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -636,8 +636,16 @@ static const struct proc_ops vcpudispatch_stats_freq_proc_ops = { static int __init vcpudispatch_stats_procfs_init(void) { - if (!lppaca_shared_proc(get_lppaca())) + /* + * Avoid smp_processor_id while preemptible. All CPUs should have + * the same value for lppaca_shared_proc. + */ + preempt_disable(); + if (!lppaca_shared_proc(get_lppaca())) { + preempt_enable(); return 0; + } + preempt_enable(); if (!proc_create("powerpc/vcpudispatch_stats", 0600, NULL, &vcpudispatch_stats_proc_ops)) -- 2.23.0