From: "Rafael J. Wysocki" <rafael@kernel.org> To: Lee Jones <lee.jones@linaro.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>, Viresh Kumar <viresh.kumar@linaro.org>, Linux ARM <linux-arm-kernel@lists.infradead.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux PM <linux-pm@vger.kernel.org>, Andreas Herrmann <herrmann.der.user@googlemail.com>, Dominik Brodowski <linux@brodo.de>, Pavel Machek <pavel@ucw.cz>, Paul Devriendt <paul.devriendt@amd.com>, Mark Langsdorf <mark.langsdorf@amd.com> Subject: Re: [PATCH 10/13] cpufreq: powernow-k8: Make use of known set but not used variables Date: Tue, 14 Jul 2020 19:43:48 +0200 [thread overview] Message-ID: <CAJZ5v0jXjtZ0=ZnOZm2LNR32TwWSrq4C4bwhNh5tOOChfpWZxw@mail.gmail.com> (raw) In-Reply-To: <20200714145049.2496163-11-lee.jones@linaro.org> On Tue, Jul 14, 2020 at 4:51 PM Lee Jones <lee.jones@linaro.org> wrote: > > If we fail to use a variable, even a 'dummy' one, then the compiler > complains that it is set but not used. We know this is fine, so we > set it to its own value here. > > Fixes the following W=1 kernel build warning(s): > > drivers/cpufreq/powernow-k8.c: In function ‘pending_bit_stuck’: > drivers/cpufreq/powernow-k8.c:89:10: warning: variable ‘hi’ set but not used [-Wunused-but-set-variable] > 89 | u32 lo, hi; > | ^~ > drivers/cpufreq/powernow-k8.c: In function ‘core_voltage_pre_transition’: > drivers/cpufreq/powernow-k8.c:285:14: warning: variable ‘lo’ set but not used [-Wunused-but-set-variable] > 285 | u32 maxvid, lo, rvomult = 1; > | ^~ > > Cc: Andreas Herrmann <herrmann.der.user@googlemail.com> > Cc: Dominik Brodowski <linux@brodo.de> > Cc: Pavel Machek <pavel@ucw.cz> > Cc: Paul Devriendt <paul.devriendt@amd.com> > Cc: Mark Langsdorf <mark.langsdorf@amd.com> > Signed-off-by: Lee Jones <lee.jones@linaro.org> > --- > drivers/cpufreq/powernow-k8.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c > index 3984959eed1d5..b76df81044c4f 100644 > --- a/drivers/cpufreq/powernow-k8.c > +++ b/drivers/cpufreq/powernow-k8.c > @@ -89,6 +89,7 @@ static int pending_bit_stuck(void) > u32 lo, hi; > > rdmsr(MSR_FIDVID_STATUS, lo, hi); > + hi &= hi; /* Silence set but not used warning */ Hmm. What about using __always_unused for this? > return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0; > } > > @@ -292,6 +293,7 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data, > rvomult = 2; > rvosteps *= rvomult; > rdmsr(MSR_FIDVID_STATUS, lo, maxvid); > + lo &= lo; /* Silence set but not used warning */ > maxvid = 0x1f & (maxvid >> 16); > pr_debug("ph1 maxvid=0x%x\n", maxvid); > if (reqvid < maxvid) /* lower numbers are higher voltages */ > -- > 2.25.1 >
WARNING: multiple messages have this Message-ID (diff)
From: "Rafael J. Wysocki" <rafael@kernel.org> To: Lee Jones <lee.jones@linaro.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>, Linux PM <linux-pm@vger.kernel.org>, Viresh Kumar <viresh.kumar@linaro.org>, Paul Devriendt <paul.devriendt@amd.com>, Andreas Herrmann <herrmann.der.user@googlemail.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Mark Langsdorf <mark.langsdorf@amd.com>, Pavel Machek <pavel@ucw.cz>, Linux ARM <linux-arm-kernel@lists.infradead.org>, Dominik Brodowski <linux@brodo.de> Subject: Re: [PATCH 10/13] cpufreq: powernow-k8: Make use of known set but not used variables Date: Tue, 14 Jul 2020 19:43:48 +0200 [thread overview] Message-ID: <CAJZ5v0jXjtZ0=ZnOZm2LNR32TwWSrq4C4bwhNh5tOOChfpWZxw@mail.gmail.com> (raw) In-Reply-To: <20200714145049.2496163-11-lee.jones@linaro.org> On Tue, Jul 14, 2020 at 4:51 PM Lee Jones <lee.jones@linaro.org> wrote: > > If we fail to use a variable, even a 'dummy' one, then the compiler > complains that it is set but not used. We know this is fine, so we > set it to its own value here. > > Fixes the following W=1 kernel build warning(s): > > drivers/cpufreq/powernow-k8.c: In function ‘pending_bit_stuck’: > drivers/cpufreq/powernow-k8.c:89:10: warning: variable ‘hi’ set but not used [-Wunused-but-set-variable] > 89 | u32 lo, hi; > | ^~ > drivers/cpufreq/powernow-k8.c: In function ‘core_voltage_pre_transition’: > drivers/cpufreq/powernow-k8.c:285:14: warning: variable ‘lo’ set but not used [-Wunused-but-set-variable] > 285 | u32 maxvid, lo, rvomult = 1; > | ^~ > > Cc: Andreas Herrmann <herrmann.der.user@googlemail.com> > Cc: Dominik Brodowski <linux@brodo.de> > Cc: Pavel Machek <pavel@ucw.cz> > Cc: Paul Devriendt <paul.devriendt@amd.com> > Cc: Mark Langsdorf <mark.langsdorf@amd.com> > Signed-off-by: Lee Jones <lee.jones@linaro.org> > --- > drivers/cpufreq/powernow-k8.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/cpufreq/powernow-k8.c b/drivers/cpufreq/powernow-k8.c > index 3984959eed1d5..b76df81044c4f 100644 > --- a/drivers/cpufreq/powernow-k8.c > +++ b/drivers/cpufreq/powernow-k8.c > @@ -89,6 +89,7 @@ static int pending_bit_stuck(void) > u32 lo, hi; > > rdmsr(MSR_FIDVID_STATUS, lo, hi); > + hi &= hi; /* Silence set but not used warning */ Hmm. What about using __always_unused for this? > return lo & MSR_S_LO_CHANGE_PENDING ? 1 : 0; > } > > @@ -292,6 +293,7 @@ static int core_voltage_pre_transition(struct powernow_k8_data *data, > rvomult = 2; > rvosteps *= rvomult; > rdmsr(MSR_FIDVID_STATUS, lo, maxvid); > + lo &= lo; /* Silence set but not used warning */ > maxvid = 0x1f & (maxvid >> 16); > pr_debug("ph1 maxvid=0x%x\n", maxvid); > if (reqvid < maxvid) /* lower numbers are higher voltages */ > -- > 2.25.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-07-14 17:44 UTC|newest] Thread overview: 150+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-14 14:50 [PATCH 00/13] Rid W=1 warnings in CPUFreq Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 14:50 ` [PATCH 01/13] cpufreq: freq_table: Demote obvious misuse of kerneldoc to standard comment blocks Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 2:44 ` Viresh Kumar 2020-07-15 2:44 ` Viresh Kumar 2020-07-14 14:50 ` [PATCH 02/13] cpufreq: cpufreq: Demote lots of function headers unworthy of kerneldoc status Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 2:49 ` Viresh Kumar 2020-07-15 2:49 ` Viresh Kumar 2020-07-15 6:47 ` Lee Jones 2020-07-15 6:47 ` Lee Jones 2020-07-15 7:09 ` Viresh Kumar 2020-07-15 7:09 ` Viresh Kumar 2020-07-14 14:50 ` [PATCH 03/13] cpufreq: cpufreq_governor: Demote store_sampling_rate() header to standard comment block Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 2:52 ` Viresh Kumar 2020-07-15 2:52 ` Viresh Kumar 2020-07-15 6:45 ` Lee Jones 2020-07-15 6:45 ` Lee Jones 2020-07-15 7:08 ` Viresh Kumar 2020-07-15 7:08 ` Viresh Kumar 2020-07-15 7:31 ` Lee Jones 2020-07-15 7:31 ` Lee Jones 2020-07-15 8:02 ` Viresh Kumar 2020-07-15 8:02 ` Viresh Kumar 2020-07-15 8:15 ` Lee Jones 2020-07-15 8:15 ` Lee Jones 2020-07-14 14:50 ` [PATCH 04/13] cpufreq: sti-cpufreq: Fix some formatting and misspelling issues Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 2:58 ` Viresh Kumar 2020-07-15 2:58 ` Viresh Kumar 2020-07-14 14:50 ` [PATCH 05/13] cpufreq/arch: powerpc: pasemi: Move prototypes to shared header Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 3:07 ` Viresh Kumar 2020-07-15 3:07 ` Viresh Kumar 2020-07-15 3:07 ` Viresh Kumar 2020-07-15 3:49 ` Olof Johansson 2020-07-15 3:49 ` Olof Johansson 2020-07-15 3:49 ` Olof Johansson 2020-07-15 3:51 ` Viresh Kumar 2020-07-15 3:51 ` Viresh Kumar 2020-07-15 3:51 ` Viresh Kumar 2020-07-15 6:36 ` Lee Jones 2020-07-15 6:36 ` Lee Jones 2020-07-15 6:36 ` Lee Jones 2020-07-15 6:39 ` Viresh Kumar 2020-07-15 6:39 ` Viresh Kumar 2020-07-15 6:39 ` Viresh Kumar 2020-07-15 3:26 ` Olof Johansson 2020-07-15 3:26 ` Olof Johansson 2020-07-15 3:26 ` Olof Johansson 2020-07-15 6:33 ` Lee Jones 2020-07-15 6:33 ` Lee Jones 2020-07-15 6:33 ` Lee Jones 2020-07-15 6:46 ` Olof Johansson 2020-07-15 6:46 ` Olof Johansson 2020-07-15 6:46 ` Olof Johansson 2020-07-15 7:33 ` Lee Jones 2020-07-15 7:33 ` Lee Jones 2020-07-15 7:33 ` Lee Jones 2020-07-14 14:50 ` [PATCH 06/13] cpufreq: powernv-cpufreq: Functions only used in call-backs should be static Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 3:07 ` Viresh Kumar 2020-07-15 3:07 ` Viresh Kumar 2020-07-15 3:07 ` Viresh Kumar 2020-07-14 14:50 ` [PATCH 07/13] cpufreq: powernv-cpufreq: Fix a bunch of kerneldoc related issues Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-15 3:09 ` Viresh Kumar 2020-07-15 3:09 ` Viresh Kumar 2020-07-15 3:09 ` Viresh Kumar 2020-07-14 14:50 ` [PATCH 08/13] cpufreq: acpi-cpufreq: Take 'dummy' principle one stage further Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 16:03 ` Rafael J. Wysocki 2020-07-14 16:03 ` Rafael J. Wysocki 2020-07-14 16:20 ` Robin Murphy 2020-07-14 16:20 ` Robin Murphy 2020-07-14 21:00 ` Lee Jones 2020-07-14 21:00 ` Lee Jones 2020-07-14 14:50 ` [PATCH 09/13] cpufreq: acpi-cpufreq: Remove unused ID structs Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 15:58 ` Rafael J. Wysocki 2020-07-14 15:58 ` Rafael J. Wysocki 2020-07-14 21:03 ` Lee Jones 2020-07-14 21:03 ` Lee Jones 2020-07-15 3:24 ` Viresh Kumar 2020-07-15 3:24 ` Viresh Kumar 2020-07-15 3:27 ` Viresh Kumar 2020-07-15 3:27 ` Viresh Kumar 2020-07-15 6:37 ` Lee Jones 2020-07-15 6:37 ` Lee Jones 2020-07-15 11:27 ` Rafael J. Wysocki 2020-07-15 11:27 ` Rafael J. Wysocki 2020-07-15 11:34 ` Lee Jones 2020-07-15 11:34 ` Lee Jones 2020-07-15 11:44 ` Rafael J. Wysocki 2020-07-15 11:44 ` Rafael J. Wysocki 2020-07-15 11:50 ` Lee Jones 2020-07-15 11:50 ` Lee Jones 2020-07-15 12:07 ` Lee Jones 2020-07-15 12:07 ` Lee Jones 2020-07-15 12:11 ` Rafael J. Wysocki 2020-07-15 12:11 ` Rafael J. Wysocki 2020-07-15 12:09 ` Rafael J. Wysocki 2020-07-15 12:09 ` Rafael J. Wysocki 2020-07-15 12:16 ` Lee Jones 2020-07-15 12:16 ` Lee Jones 2020-07-15 12:30 ` Robin Murphy 2020-07-15 12:30 ` Robin Murphy 2020-07-15 12:38 ` Lee Jones 2020-07-15 12:38 ` Lee Jones 2020-07-14 14:50 ` [PATCH 10/13] cpufreq: powernow-k8: Make use of known set but not used variables Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 17:43 ` Rafael J. Wysocki [this message] 2020-07-14 17:43 ` Rafael J. Wysocki 2020-07-14 21:01 ` Lee Jones 2020-07-14 21:01 ` Lee Jones 2020-07-14 14:50 ` [PATCH 11/13] cpufreq: pcc-cpufreq: Remove unused ID structs Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 17:42 ` Rafael J. Wysocki 2020-07-14 17:42 ` Rafael J. Wysocki 2020-07-14 14:50 ` [PATCH 12/13] cpufreq: intel_pstate: Supply struct attribute description for get_aperf_mperf_shift() Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 16:35 ` Rafael J. Wysocki 2020-07-14 16:35 ` Rafael J. Wysocki 2020-07-14 21:03 ` Lee Jones 2020-07-14 21:03 ` Lee Jones 2020-07-15 12:38 ` Rafael J. Wysocki 2020-07-15 12:38 ` Rafael J. Wysocki 2020-07-14 14:50 ` [PATCH 13/13] cpufreq: amd_freq_sensitivity: Remove unused ID structs Lee Jones 2020-07-14 14:50 ` Lee Jones 2020-07-14 17:15 ` Kim Phillips 2020-07-14 17:15 ` Kim Phillips 2020-07-14 21:02 ` Lee Jones 2020-07-14 21:02 ` Lee Jones 2020-07-14 21:13 ` Kim Phillips 2020-07-14 21:13 ` Kim Phillips 2020-07-15 6:47 ` Lee Jones 2020-07-15 6:47 ` Lee Jones 2020-07-15 3:36 ` [PATCH 00/13] Rid W=1 warnings in CPUFreq Viresh Kumar 2020-07-15 3:36 ` Viresh Kumar 2020-07-15 6:32 ` Lee Jones 2020-07-15 6:32 ` Lee Jones 2020-07-15 6:38 ` Viresh Kumar 2020-07-15 6:38 ` Viresh Kumar 2020-07-15 7:34 ` Lee Jones 2020-07-15 7:34 ` Lee Jones
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to='CAJZ5v0jXjtZ0=ZnOZm2LNR32TwWSrq4C4bwhNh5tOOChfpWZxw@mail.gmail.com' \ --to=rafael@kernel.org \ --cc=herrmann.der.user@googlemail.com \ --cc=lee.jones@linaro.org \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-pm@vger.kernel.org \ --cc=linux@brodo.de \ --cc=mark.langsdorf@amd.com \ --cc=paul.devriendt@amd.com \ --cc=pavel@ucw.cz \ --cc=rjw@rjwysocki.net \ --cc=viresh.kumar@linaro.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.