[patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on unsigned

From: Roel Kluin <redacted>

count is unsigned and cannot be less than 0.

Signed-off-by: Roel Kluin <redacted>
Acked-by: Cyrill Gorcunov <redacted>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <redacted>
Cc: Brian Waite <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/misc/hdpuftrs/hdpu_cpustate.c |    5 -----
 1 file changed, 5 deletions(-)

diff -puN drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned drivers/misc/hdpuftrs/hdpu_cpustate.c

--- a/drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned
+++ a/drivers/misc/hdpuftrs/hdpu_cpustate.c

@@ -121,8 +121,6 @@ static ssize_t cpustate_read(struct file
 {
 	unsigned char data;
 
-	if (count < 0)
-		return -EFAULT;
 	if (count == 0)
 		return 0;
 

@@ -137,9 +135,6 @@ static ssize_t cpustate_write(struct fil
 {
 	unsigned char data;
 
-	if (count < 0)
-		return -EFAULT;
-
 	if (count == 0)
 		return 0;
 

_

On Tue, 2010-02-02 at 14:40 -0800, akpm@linux-foundation.org wrote:

From: Roel Kluin <redacted>

count is unsigned and cannot be less than 0.

Signed-off-by: Roel Kluin <redacted>
Acked-by: Cyrill Gorcunov <redacted>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <redacted>
Cc: Brian Waite <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

I still have a hard time figuring out what this sky CPU actually is :-) 

The whole drivers/misc/hdpuftrs is only built when CONFIG_HDPU_FEATURES
is set and git grep HDPU_FEATURES doesn't show anybody ever setting
it :-)

Is that just dead code ? I'm happy to carry it in powerpc.git if you
wish so but you it would be nice to figure out what's going on there...

Cheers,
Ben.

On Wed, 2010-02-03 at 19:10 -0500, support wrote:

The sky cpu is a PPC7448.
I'm actually amazed that you guys are still working on a problem for
a 
product that was finished a number of years ago, at the request of
someone 
who hasn't worked here for years.
I sorry you, seem to have been wasting your time.
I think, but am NOT sure,  that our HAA function sets it off.
http://www.skycomputers.com/Systems/HAA_HMM.php

Still, we have finished the product some time ago, and as far as
reported 
have no problems.
Again, I'm sorry you have wasted any time on this, we just recently
found 
these emails.

Well, there seem to be some code in the Linux kernel related to that CPU
that is either dead or incomplete. So if you guys have no interest in
it, we might just rip it out completely.

Cheers,
Ben.

To All:
The sky cpu is a PPC7448.
I'm actually amazed that you guys are still working on a problem for a 
product that was finished a number of years ago, at the request of someone 
who hasn't worked here for years.
I sorry you, seem to have been wasting your time.
I think, but am NOT sure,  that our HAA function sets it off.
http://www.skycomputers.com/Systems/HAA_HMM.php

Still, we have finished the product some time ago, and as far as reported 
have no problems.
Again, I'm sorry you have wasted any time on this, we just recently found 
these emails.


Dave Bushee
Director OEM Sales and Services
SKY Computers Inc.
27 Industrial Ave.
978-250-2420 x232
www.skycomputers.com


----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: <akpm@linux-foundation.org>
Cc: <redacted>; <redacted>; 
[off-list ref]; [off-list ref]; [off-list ref]
Sent: Wednesday, February 03, 2010 6:21 PM
Subject: Re: [patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on 
unsigned

On Tue, 2010-02-02 at 14:40 -0800, akpm@linux-foundation.org wrote:

quoted

From: Roel Kluin <redacted>

count is unsigned and cannot be less than 0.

Signed-off-by: Roel Kluin <redacted>
Acked-by: Cyrill Gorcunov <redacted>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <redacted>
Cc: Brian Waite <redacted>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

I still have a hard time figuring out what this sky CPU actually is :-)

The whole drivers/misc/hdpuftrs is only built when CONFIG_HDPU_FEATURES
is set and git grep HDPU_FEATURES doesn't show anybody ever setting
it :-)

Is that just dead code ? I'm happy to carry it in powerpc.git if you
wish so but you it would be nice to figure out what's going on there...

Cheers,
Ben.

quoted

 drivers/misc/hdpuftrs/hdpu_cpustate.c |    5 -----
 1 file changed, 5 deletions(-)

diff -puN 
drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned 
drivers/misc/hdpuftrs/hdpu_cpustate.c
---  
a/drivers/misc/hdpuftrs/hdpu_cpustate.c~powerpc-sky-cpu-redundant-or-incorrect-tests-on-unsigned

+++ a/drivers/misc/hdpuftrs/hdpu_cpustate.c

@@ -121,8 +121,6 @@ static ssize_t cpustate_read(struct file
 {
 unsigned char data;

- if (count < 0)
- return -EFAULT;
 if (count == 0)
 return 0;

@@ -137,9 +135,6 @@ static ssize_t cpustate_write(struct fil
 {
 unsigned char data;

- if (count < 0)
- return -EFAULT;
-
 if (count == 0)
 return 0;

_

I doubt we'll be going to be using 7448's any more for future product lines.

Dave Bushee
Director OEM Sales and Services
SKY Computers Inc.
27 Industrial Ave.
978-250-2420 x232
www.skycomputers.com


----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "support" <redacted>
Cc: <akpm@linux-foundation.org>; <redacted>; 
[off-list ref]; [off-list ref]; [off-list ref]; 
[off-list ref]
Sent: Wednesday, February 03, 2010 7:18 PM
Subject: Re: [patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on 
unsigned

On Wed, 2010-02-03 at 19:10 -0500, support wrote:

quoted

The sky cpu is a PPC7448.
I'm actually amazed that you guys are still working on a problem for
a
product that was finished a number of years ago, at the request of
someone
who hasn't worked here for years.
I sorry you, seem to have been wasting your time.
I think, but am NOT sure,  that our HAA function sets it off.
http://www.skycomputers.com/Systems/HAA_HMM.php

Still, we have finished the product some time ago, and as far as
reported
have no problems.
Again, I'm sorry you have wasted any time on this, we just recently
found
these emails.

Well, there seem to be some code in the Linux kernel related to that CPU
that is either dead or incomplete. So if you guys have no interest in
it, we might just rip it out completely.

Cheers,
Ben.

On Wed, 2010-02-03 at 20:47 -0500, support wrote:

I doubt we'll be going to be using 7448's any more for future product lines.

Hi !

Well, that isn't really the question :-) Is there any interest in
ensuring that your current Sky is supported by upstream linux kernels or
not ? As I said, the current kernel seems to contain code relative to
the Sky CPU that is never enabled and potentially has issue. Are you
guys interested in fixing this so that upstream linux supports your
existing products, or should we just rip the code out ?

Cheers,
Ben.
 

Dave Bushee
Director OEM Sales and Services
SKY Computers Inc.
27 Industrial Ave.
978-250-2420 x232
www.skycomputers.com


----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "support" <redacted>
Cc: <akpm@linux-foundation.org>; <redacted>; 
[off-list ref]; [off-list ref]; [off-list ref]; 
[off-list ref]
Sent: Wednesday, February 03, 2010 7:18 PM
Subject: Re: [patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on 
unsigned

quoted

On Wed, 2010-02-03 at 19:10 -0500, support wrote:

quoted

The sky cpu is a PPC7448.
I'm actually amazed that you guys are still working on a problem for
a
product that was finished a number of years ago, at the request of
someone
who hasn't worked here for years.
I sorry you, seem to have been wasting your time.
I think, but am NOT sure,  that our HAA function sets it off.
http://www.skycomputers.com/Systems/HAA_HMM.php

Still, we have finished the product some time ago, and as far as
reported
have no problems.
Again, I'm sorry you have wasted any time on this, we just recently
found
these emails.

Well, there seem to be some code in the Linux kernel related to that CPU
that is either dead or incomplete. So if you guys have no interest in
it, we might just rip it out completely.

Cheers,
Ben.

We don't plan on carrying it forward, so I assume that ripping it out will
not affect us.
Anything new would be completely new development.



-----Original Message-----
From: Benjamin Herrenschmidt [mailto:benh@kernel.crashing.org] 
Sent: Wednesday, February 03, 2010 9:01 PM
To: support
Cc: akpm@linux-foundation.org; linuxppc-dev@ozlabs.org;
roel.kluin@gmail.com; galak@gate.crashing.org; gorcunov@gmail.com;
waite@skycomputers.com
Subject: Re: [patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on
unsigned

On Wed, 2010-02-03 at 20:47 -0500, support wrote:

I doubt we'll be going to be using 7448's any more for future product

lines.

Hi !

Well, that isn't really the question :-) Is there any interest in
ensuring that your current Sky is supported by upstream linux kernels or
not ? As I said, the current kernel seems to contain code relative to
the Sky CPU that is never enabled and potentially has issue. Are you
guys interested in fixing this so that upstream linux supports your
existing products, or should we just rip the code out ?

Cheers,
Ben.
 

Dave Bushee
Director OEM Sales and Services
SKY Computers Inc.
27 Industrial Ave.
978-250-2420 x232
www.skycomputers.com


----- Original Message ----- 
From: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>
To: "support" <redacted>
Cc: <akpm@linux-foundation.org>; <redacted>; 
[off-list ref]; [off-list ref]; [off-list ref]; 
[off-list ref]
Sent: Wednesday, February 03, 2010 7:18 PM
Subject: Re: [patch 1/2] powerpc: Sky CPU: redundant or incorrect tests on

unsigned

quoted

On Wed, 2010-02-03 at 19:10 -0500, support wrote:

quoted

The sky cpu is a PPC7448.
I'm actually amazed that you guys are still working on a problem for
a
product that was finished a number of years ago, at the request of
someone
who hasn't worked here for years.
I sorry you, seem to have been wasting your time.
I think, but am NOT sure,  that our HAA function sets it off.
http://www.skycomputers.com/Systems/HAA_HMM.php

Still, we have finished the product some time ago, and as far as
reported
have no problems.
Again, I'm sorry you have wasted any time on this, we just recently
found
these emails.

Well, there seem to be some code in the Linux kernel related to that CPU
that is either dead or incomplete. So if you guys have no interest in
it, we might just rip it out completely.

Cheers,
Ben.