From mboxrd@z Thu Jan 1 00:00:00 1970 From: Viresh Kumar Subject: Re: [PATCH] opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table Date: Thu, 8 Feb 2018 20:15:13 +0530 Message-ID: <20180208144513.GW28462@vireshk-i7> References: <1516956529-32264-1-git-send-email-baijiaju1990@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1516956529-32264-1-git-send-email-baijiaju1990@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Jia-Ju Bai Cc: vireshk@kernel.org, nm@ti.com, sboyd@codeaurora.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-pm@vger.kernel.org On 26-01-18, 16:48, Jia-Ju Bai wrote: > After checking all possible call chains to > dev_pm_opp_init_cpufreq_table() here, > my tool finds that this function is never called in atomic context, > namely never in an interrupt handler or holding a spinlock. > And dev_pm_opp_init_cpufreq_table() calls dev_pm_opp_get_opp_count(), > which calls mutex_lock that can sleep. > It indicates that atmtcp_v_send() can call functions which may sleep. > Thus GFP_ATOMIC is not necessary, and it can be replaced with GFP_KERNEL. > > This is found by a static analysis tool named DCNS written by myself. > > Signed-off-by: Jia-Ju Bai > --- > drivers/opp/cpu.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/opp/cpu.c b/drivers/opp/cpu.c > index 2d87bc1..0c09107 100644 > --- a/drivers/opp/cpu.c > +++ b/drivers/opp/cpu.c > @@ -55,7 +55,7 @@ int dev_pm_opp_init_cpufreq_table(struct device *dev, > if (max_opps <= 0) > return max_opps ? max_opps : -ENODATA; > > - freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_ATOMIC); > + freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL); > if (!freq_table) > return -ENOMEM; Applied thanks. -- viresh