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* [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators
@ 2019-07-29 12:03 Colin King
  2019-07-29 12:34 ` walter harms
  2019-07-29 21:09 ` Srinivas Pandruvada
  0 siblings, 2 replies; 4+ messages in thread
From: Colin King @ 2019-07-29 12:03 UTC (permalink / raw)
  To: Zhang Rui, Eduardo Valentin, Daniel Lezcano, Srinivas Pandruvada,
	linux-pm
  Cc: kernel-janitors, linux-kernel

From: Colin Ian King <colin.king@canonical.com>

The variable val is having the top 8 bits cleared and then the variable is being
re-assinged and setting just the top 8 bits.  I believe the intention was bitwise-or
in the top 8 bits.  Fix this by replacing the = operators with &= and |= instead.

Addresses-Coverity: ("Unused value")
Fixes: b0c74b08517e ("drivers: thermal: processor_thermal_device: Export sysfs inteface for TCC offset")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---

V2: Add in &= operator missing from V1. Doh.

---
 .../thermal/intel/int340x_thermal/processor_thermal_device.c  | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
index 6f6ac6a8e82d..97333fc4be42 100644
--- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
+++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
@@ -163,8 +163,8 @@ static int tcc_offset_update(int tcc)
 	if (err)
 		return err;
 
-	val = ~GENMASK_ULL(31, 24);
-	val = (tcc & 0xff) << 24;
+	val &= ~GENMASK_ULL(31, 24);
+	val |= (tcc & 0xff) << 24;
 
 	err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
 	if (err)
-- 
2.20.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators
  2019-07-29 12:03 [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators Colin King
@ 2019-07-29 12:34 ` walter harms
  2019-07-29 21:09 ` Srinivas Pandruvada
  1 sibling, 0 replies; 4+ messages in thread
From: walter harms @ 2019-07-29 12:34 UTC (permalink / raw)
  To: Colin King
  Cc: Zhang Rui, Eduardo Valentin, Daniel Lezcano, Srinivas Pandruvada,
	linux-pm, kernel-janitors, linux-kernel



Am 29.07.2019 14:03, schrieb Colin King:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The variable val is having the top 8 bits cleared and then the variable is being
> re-assinged and setting just the top 8 bits.  I believe the intention was bitwise-or
> in the top 8 bits.  Fix this by replacing the = operators with &= and |= instead.
> 
> Addresses-Coverity: ("Unused value")
> Fixes: b0c74b08517e ("drivers: thermal: processor_thermal_device: Export sysfs inteface for TCC offset")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> 
> V2: Add in &= operator missing from V1. Doh.
> 
> ---
>  .../thermal/intel/int340x_thermal/processor_thermal_device.c  | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> index 6f6ac6a8e82d..97333fc4be42 100644
> --- a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> +++ b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> @@ -163,8 +163,8 @@ static int tcc_offset_update(int tcc)
>  	if (err)
>  		return err;
>  
> -	val = ~GENMASK_ULL(31, 24);
> -	val = (tcc & 0xff) << 24;
> +	val &= ~GENMASK_ULL(31, 24);
> +	val |= (tcc & 0xff) << 24;
>  

IMHO GENMASK_ULL(31, 24) is a complicated way to say 0xFF000000
In this special case it would be better to use that (or 0xff<<24).

just my 2 cents,

re,
 wh


>  	err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
>  	if (err)

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators
  2019-07-29 12:03 [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators Colin King
  2019-07-29 12:34 ` walter harms
@ 2019-07-29 21:09 ` Srinivas Pandruvada
  2019-08-19  6:32   ` Zhang Rui
  1 sibling, 1 reply; 4+ messages in thread
From: Srinivas Pandruvada @ 2019-07-29 21:09 UTC (permalink / raw)
  To: Colin King, Zhang Rui, Eduardo Valentin, Daniel Lezcano, linux-pm
  Cc: kernel-janitors, linux-kernel

On Mon, 2019-07-29 at 13:03 +0100, Colin King wrote:
> From: Colin Ian King <colin.king@canonical.com>
> 
> The variable val is having the top 8 bits cleared and then the
> variable is being
> re-assinged and setting just the top 8 bits.  I believe the intention
> was bitwise-or
> in the top 8 bits.  Fix this by replacing the = operators with &= and
> |= instead.
> 
> Addresses-Coverity: ("Unused value")
> Fixes: b0c74b08517e ("drivers: thermal: processor_thermal_device:
> Export sysfs inteface for TCC offset")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

> ---
> 
> V2: Add in &= operator missing from V1. Doh.
> 
> ---
>  .../thermal/intel/int340x_thermal/processor_thermal_device.c  | 4
> ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> index 6f6ac6a8e82d..97333fc4be42 100644
> ---
> a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> +++
> b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> @@ -163,8 +163,8 @@ static int tcc_offset_update(int tcc)
>  	if (err)
>  		return err;
>  
> -	val = ~GENMASK_ULL(31, 24);
> -	val = (tcc & 0xff) << 24;
> +	val &= ~GENMASK_ULL(31, 24);
> +	val |= (tcc & 0xff) << 24;
>  
>  	err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
>  	if (err)


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators
  2019-07-29 21:09 ` Srinivas Pandruvada
@ 2019-08-19  6:32   ` Zhang Rui
  0 siblings, 0 replies; 4+ messages in thread
From: Zhang Rui @ 2019-08-19  6:32 UTC (permalink / raw)
  To: Srinivas Pandruvada, Colin King, Eduardo Valentin,
	Daniel Lezcano, linux-pm
  Cc: kernel-janitors, linux-kernel

On Mon, 2019-07-29 at 14:09 -0700, Srinivas Pandruvada wrote:
> On Mon, 2019-07-29 at 13:03 +0100, Colin King wrote:
> > From: Colin Ian King <colin.king@canonical.com>
> > 
> > The variable val is having the top 8 bits cleared and then the
> > variable is being
> > re-assinged and setting just the top 8 bits.  I believe the
> > intention
> > was bitwise-or
> > in the top 8 bits.  Fix this by replacing the = operators with &=
> > and
> > > = instead.
> > 
> > Addresses-Coverity: ("Unused value")
> > Fixes: b0c74b08517e ("drivers: thermal: processor_thermal_device:
> > Export sysfs inteface for TCC offset")
> > Signed-off-by: Colin Ian King <colin.king@canonical.com>
> 
> Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com
> >

Hi, Colin,

thanks for the fix, as b0c74b08517e ("drivers: thermal:
processor_thermal_device: Export sysfs inteface for TCC offset") has
not been shipped in upstream yet, I will fold this fix into the
original patch directly.

thanks,
rui
> 
> > ---
> > 
> > V2: Add in &= operator missing from V1. Doh.
> > 
> > ---
> >  .../thermal/intel/int340x_thermal/processor_thermal_device.c  | 4
> > ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > index 6f6ac6a8e82d..97333fc4be42 100644
> > ---
> > a/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > +++
> > b/drivers/thermal/intel/int340x_thermal/processor_thermal_device.c
> > @@ -163,8 +163,8 @@ static int tcc_offset_update(int tcc)
> >  	if (err)
> >  		return err;
> >  
> > -	val = ~GENMASK_ULL(31, 24);
> > -	val = (tcc & 0xff) << 24;
> > +	val &= ~GENMASK_ULL(31, 24);
> > +	val |= (tcc & 0xff) << 24;
> >  
> >  	err = wrmsrl_safe(MSR_IA32_TEMPERATURE_TARGET, val);
> >  	if (err)
> 
> 


^ permalink raw reply	[flat|nested] 4+ messages in thread

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Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2019-07-29 12:03 [PATCH][V2] drivers: thermal: processor_thermal_device: fix missing bitwise-or operators Colin King
2019-07-29 12:34 ` walter harms
2019-07-29 21:09 ` Srinivas Pandruvada
2019-08-19  6:32   ` Zhang Rui

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