From: Arnd Bergmann <arnd@arndb.de> To: linux-kernel@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de>, linux-acpi@vger.kernel.org, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, dri-devel@lists.freedesktop.org, linux-ide@vger.kernel.org, Tejun Heo <tj@kernel.org>, akpm@linux-foundation.org, Linus Torvalds <torvalds@linux-foundation.org>, Guenter Roeck <linux@roeck-us.net>, linux-media@vger.kernel.org Subject: [PATCH 06/14] acpi: thermal: fix gcc-6/ccache warning Date: Fri, 14 Jul 2017 11:25:18 +0200 [thread overview] Message-ID: <20170714092540.1217397-7-arnd@arndb.de> (raw) In-Reply-To: <20170714092540.1217397-1-arnd@arndb.de> In some configurations, topology_physical_package_id() is trivially defined as '-1' for any input, resulting a comparison that is always true: drivers/acpi/processor_thermal.c: In function ‘cpufreq_set_cur_state’: drivers/acpi/processor_thermal.c:137:36: error: self-comparison always evaluates to true [-Werror=tautological-compare] By introducing a temporary variable, we can tell gcc that this is intentional. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/acpi/processor_thermal.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c index 59c3a5d1e600..411f3a7f4a7c 100644 --- a/drivers/acpi/processor_thermal.c +++ b/drivers/acpi/processor_thermal.c @@ -122,20 +122,22 @@ static int cpufreq_get_cur_state(unsigned int cpu) static int cpufreq_set_cur_state(unsigned int cpu, int state) { int i; + int id; if (!cpu_has_cpufreq(cpu)) return 0; reduction_pctg(cpu) = state; + id = topology_physical_package_id(cpu); + /* * Update all the CPUs in the same package because they all * contribute to the temperature and often share the same * frequency. */ for_each_online_cpu(i) { - if (topology_physical_package_id(i) == - topology_physical_package_id(cpu)) + if (topology_physical_package_id(i) == id) cpufreq_update_policy(i); } return 0; -- 2.9.0 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@arndb.de> To: linux-kernel@vger.kernel.org, Zhang Rui <rui.zhang@intel.com>, "Rafael J. Wysocki" <rjw@rjwysocki.net>, Len Brown <lenb@kernel.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Linus Torvalds <torvalds@linux-foundation.org>, Tejun Heo <tj@kernel.org>, Guenter Roeck <linux@roeck-us.net>, linux-ide@vger.kernel.org, linux-media@vger.kernel.org, akpm@linux-foundation.org, dri-devel@lists.freedesktop.org, Arnd Bergmann <arnd@arndb.de>, linux-acpi@vger.kernel.org Subject: [PATCH 06/14] acpi: thermal: fix gcc-6/ccache warning Date: Fri, 14 Jul 2017 11:25:18 +0200 [thread overview] Message-ID: <20170714092540.1217397-7-arnd@arndb.de> (raw) In-Reply-To: <20170714092540.1217397-1-arnd@arndb.de> In some configurations, topology_physical_package_id() is trivially defined as '-1' for any input, resulting a comparison that is always true: drivers/acpi/processor_thermal.c: In function ‘cpufreq_set_cur_state’: drivers/acpi/processor_thermal.c:137:36: error: self-comparison always evaluates to true [-Werror=tautological-compare] By introducing a temporary variable, we can tell gcc that this is intentional. Signed-off-by: Arnd Bergmann <arnd@arndb.de> --- drivers/acpi/processor_thermal.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/processor_thermal.c b/drivers/acpi/processor_thermal.c index 59c3a5d1e600..411f3a7f4a7c 100644 --- a/drivers/acpi/processor_thermal.c +++ b/drivers/acpi/processor_thermal.c @@ -122,20 +122,22 @@ static int cpufreq_get_cur_state(unsigned int cpu) static int cpufreq_set_cur_state(unsigned int cpu, int state) { int i; + int id; if (!cpu_has_cpufreq(cpu)) return 0; reduction_pctg(cpu) = state; + id = topology_physical_package_id(cpu); + /* * Update all the CPUs in the same package because they all * contribute to the temperature and often share the same * frequency. */ for_each_online_cpu(i) { - if (topology_physical_package_id(i) == - topology_physical_package_id(cpu)) + if (topology_physical_package_id(i) == id) cpufreq_update_policy(i); } return 0; -- 2.9.0
next prev parent reply other threads:[~2017-07-14 9:25 UTC|newest] Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-07-14 9:25 [PATCH 00/14] gcc-7 warnings Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 9:25 ` [PATCH, RESEND 01/14] ide: avoid warning for timings calculation Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 9:25 ` [PATCH, RESEND 02/14] ata: avoid gcc-7 warning in ata_timing_quantize Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-15 10:56 ` Tejun Heo 2017-07-15 10:56 ` Tejun Heo 2017-07-14 9:25 ` [PATCH, RESEND 03/14] drm/vmwgfx: avoid gcc-7 parentheses warning Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 10:11 ` Jani Nikula 2017-07-14 10:11 ` Jani Nikula 2017-07-14 19:21 ` Linus Torvalds 2017-07-14 19:21 ` Linus Torvalds 2017-07-14 19:23 ` Linus Torvalds 2017-07-14 20:28 ` Arnd Bergmann 2017-07-17 13:15 ` Sinclair Yeh 2017-07-17 13:15 ` Sinclair Yeh 2017-07-14 9:25 ` [PATCH 04/14] x86: math-emu: avoid -Wint-in-bool-context warning Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 9:25 ` [PATCH 05/14] isdn: isdnloop: suppress a gcc-7 warning Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 10:08 ` Joe Perches 2017-07-14 10:37 ` Arnd Bergmann 2017-07-15 4:20 ` Kevin Easton 2017-07-14 9:25 ` Arnd Bergmann [this message] 2017-07-14 9:25 ` [PATCH 06/14] acpi: thermal: fix gcc-6/ccache warning Arnd Bergmann 2017-07-14 9:25 ` [PATCH 07/14] proc/kcore: hide a harmless warning Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 12:28 ` Ard Biesheuvel 2017-07-18 19:53 ` Arnd Bergmann 2017-07-18 19:53 ` Arnd Bergmann 2017-07-18 19:55 ` Ard Biesheuvel 2017-07-18 20:01 ` Arnd Bergmann 2017-07-18 20:07 ` Ard Biesheuvel 2017-07-18 20:21 ` Arnd Bergmann 2017-07-14 9:25 ` [PATCH 08/14] Input: adxl34x - fix gcc-7 -Wint-in-bool-context warning Arnd Bergmann 2017-07-14 9:25 ` Arnd Bergmann 2017-07-14 19:24 ` Linus Torvalds 2017-07-14 20:17 ` Arnd Bergmann 2017-07-14 21:40 ` Dmitry Torokhov 2017-07-14 9:30 ` [PATCH 09/14] SFI: fix tautological-compare warning Arnd Bergmann 2017-07-14 9:30 ` Arnd Bergmann 2017-07-14 9:31 ` [PATCH 10/14] staging:iio:resolver:ad2s1210 fix negative IIO_ANGL_VEL read Arnd Bergmann 2017-07-14 9:31 ` Arnd Bergmann 2017-07-15 11:42 ` Jonathan Cameron 2017-07-14 9:31 ` [PATCH 11/14] IB/uverbs: fix gcc-7 type warning Arnd Bergmann 2017-07-14 9:31 ` Arnd Bergmann 2017-07-14 9:46 ` Leon Romanovsky 2017-07-14 9:31 ` [PATCH 12/14] drm/nouveau/clk: fix gcc-7 -Wint-in-bool-context warning Arnd Bergmann 2017-07-14 9:31 ` Arnd Bergmann 2017-07-14 9:31 ` [PATCH 13/14] iopoll: avoid " Arnd Bergmann 2017-07-14 9:31 ` Arnd Bergmann 2017-07-14 9:55 ` Joe Perches 2017-07-14 10:22 ` Arnd Bergmann 2017-07-14 9:36 ` [PATCH 14/14] [media] fix warning on v4l2_subdev_call() result interpreted as bool Arnd Bergmann 2017-07-14 9:36 ` Arnd Bergmann 2017-07-14 9:36 ` Arnd Bergmann 2017-07-14 12:05 ` Dan Carpenter 2017-07-14 12:05 ` Dan Carpenter 2017-07-14 12:05 ` Dan Carpenter 2017-07-14 12:27 ` Arnd Bergmann 2017-07-14 12:27 ` Arnd Bergmann 2017-07-14 12:27 ` Arnd Bergmann 2017-07-14 12:55 ` Dan Carpenter 2017-07-14 12:55 ` Dan Carpenter 2017-07-14 12:55 ` Dan Carpenter 2017-07-14 13:09 ` Dan Carpenter 2017-07-14 13:09 ` Dan Carpenter 2017-07-14 13:09 ` Dan Carpenter 2017-07-14 19:32 ` Arnd Bergmann 2017-07-14 19:32 ` Arnd Bergmann 2017-07-14 19:32 ` Arnd Bergmann 2017-07-14 12:41 ` Dan Carpenter 2017-07-14 12:41 ` Dan Carpenter 2017-07-14 12:41 ` Dan Carpenter 2017-07-17 13:45 ` Hans Verkuil 2017-07-17 13:45 ` Hans Verkuil 2017-07-17 14:26 ` Arnd Bergmann 2017-07-17 14:26 ` Arnd Bergmann 2017-07-17 14:26 ` Arnd Bergmann 2017-07-17 14:28 ` Dan Carpenter 2017-07-17 14:28 ` Dan Carpenter 2017-07-17 14:28 ` Dan Carpenter 2017-07-17 14:32 ` Hans Verkuil 2017-07-17 14:32 ` Hans Verkuil 2017-07-17 14:32 ` Hans Verkuil 2017-07-17 14:35 ` Hans Verkuil 2017-07-17 14:35 ` Hans Verkuil 2017-07-17 14:35 ` Hans Verkuil 2017-07-17 21:23 ` Arnd Bergmann 2017-07-17 21:23 ` Arnd Bergmann 2017-07-17 21:23 ` Arnd Bergmann 2017-07-14 10:29 ` [PATCH 00/14] gcc-7 warnings Greg Kroah-Hartman 2017-07-14 10:29 ` Greg Kroah-Hartman
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