[PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[He Ying]

warning: symbol 'rfi_flush' was not declared.
warning: symbol 'entry_flush' was not declared.
warning: symbol 'uaccess_flush' was not declared.
We found warnings above in arch/powerpc/kernel/setup_64.c by using
sparse tool.

Define 'entry_flush' and 'uaccess_flush' as static because they are not
referenced outside the file. Include asm/security_features.h in which
'rfi_flush' is declared.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: He Ying <heying24@huawei.com>
---
 arch/powerpc/kernel/setup_64.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 560ed8b975e7..f92d72a7e7ce 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -68,6 +68,7 @@
 #include <asm/early_ioremap.h>
 #include <asm/pgalloc.h>
 #include <asm/asm-prototypes.h>
+#include <asm/security_features.h>
 
 #include "setup.h"
 
@@ -949,8 +950,8 @@ static bool no_rfi_flush;
 static bool no_entry_flush;
 static bool no_uaccess_flush;
 bool rfi_flush;
-bool entry_flush;
-bool uaccess_flush;
+static bool entry_flush;
+static bool uaccess_flush;
 DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
 EXPORT_SYMBOL(uaccess_flush_key);
 
-- 
2.17.1

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[Christophe Leroy]

Le 16/03/2021 à 05:11, He Ying a écrit :
> warning: symbol 'rfi_flush' was not declared.
> warning: symbol 'entry_flush' was not declared.
> warning: symbol 'uaccess_flush' was not declared.
> We found warnings above in arch/powerpc/kernel/setup_64.c by using
> sparse tool.
> 
> Define 'entry_flush' and 'uaccess_flush' as static because they are not
> referenced outside the file. Include asm/security_features.h in which
> 'rfi_flush' is declared.
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: He Ying <heying24@huawei.com>

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>

> ---
>   arch/powerpc/kernel/setup_64.c | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 560ed8b975e7..f92d72a7e7ce 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -68,6 +68,7 @@
>   #include <asm/early_ioremap.h>
>   #include <asm/pgalloc.h>
>   #include <asm/asm-prototypes.h>
> +#include <asm/security_features.h>
>   
>   #include "setup.h"
>   
> @@ -949,8 +950,8 @@ static bool no_rfi_flush;
>   static bool no_entry_flush;
>   static bool no_uaccess_flush;
>   bool rfi_flush;
> -bool entry_flush;
> -bool uaccess_flush;
> +static bool entry_flush;
> +static bool uaccess_flush;
>   DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
>   EXPORT_SYMBOL(uaccess_flush_key);
>   
> 

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[Daniel Axtens]

Hi He Ying,

Thank you for this patch.

I'm not sure what the precise rules for Fixes are, but I wonder if this
should have:

Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")

Those are the commits that added the entry_flush and uaccess_flush
symbols. Perhaps one for rfi_flush too but I'm not sure what commit
introduced that.

Kind regards,
Daniel

> warning: symbol 'rfi_flush' was not declared.
> warning: symbol 'entry_flush' was not declared.
> warning: symbol 'uaccess_flush' was not declared.
> We found warnings above in arch/powerpc/kernel/setup_64.c by using
> sparse tool.
>
> Define 'entry_flush' and 'uaccess_flush' as static because they are not
> referenced outside the file. Include asm/security_features.h in which
> 'rfi_flush' is declared.
>
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: He Ying <heying24@huawei.com>
> ---
>  arch/powerpc/kernel/setup_64.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
> index 560ed8b975e7..f92d72a7e7ce 100644
> --- a/arch/powerpc/kernel/setup_64.c
> +++ b/arch/powerpc/kernel/setup_64.c
> @@ -68,6 +68,7 @@
>  #include <asm/early_ioremap.h>
>  #include <asm/pgalloc.h>
>  #include <asm/asm-prototypes.h>
> +#include <asm/security_features.h>
>  
>  #include "setup.h"
>  
> @@ -949,8 +950,8 @@ static bool no_rfi_flush;
>  static bool no_entry_flush;
>  static bool no_uaccess_flush;
>  bool rfi_flush;
> -bool entry_flush;
> -bool uaccess_flush;
> +static bool entry_flush;
> +static bool uaccess_flush;
>  DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
>  EXPORT_SYMBOL(uaccess_flush_key);
>  
> -- 
> 2.17.1

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[heying (H)]

Thank you for your reply.


在 2021/3/17 11:04, Daniel Axtens 写道:
> Hi He Ying,
>
> Thank you for this patch.
>
> I'm not sure what the precise rules for Fixes are, but I wonder if this
> should have:
>
> Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
> Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")

Is that necessary for warning cleanups? I thought 'Fixes' tags are 
needed only for

bugfix patches. Can someone tell me whether I am right?

>
> Those are the commits that added the entry_flush and uaccess_flush
> symbols. Perhaps one for rfi_flush too but I'm not sure what commit
> introduced that.
>
> Kind regards,
> Daniel
>
>> warning: symbol 'rfi_flush' was not declared.
>> warning: symbol 'entry_flush' was not declared.
>> warning: symbol 'uaccess_flush' was not declared.
>> We found warnings above in arch/powerpc/kernel/setup_64.c by using
>> sparse tool.
>>
>> Define 'entry_flush' and 'uaccess_flush' as static because they are not
>> referenced outside the file. Include asm/security_features.h in which
>> 'rfi_flush' is declared.
>>
>> Reported-by: Hulk Robot <hulkci@huawei.com>
>> Signed-off-by: He Ying <heying24@huawei.com>
>> ---
>>   arch/powerpc/kernel/setup_64.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
>> index 560ed8b975e7..f92d72a7e7ce 100644
>> --- a/arch/powerpc/kernel/setup_64.c
>> +++ b/arch/powerpc/kernel/setup_64.c
>> @@ -68,6 +68,7 @@
>>   #include <asm/early_ioremap.h>
>>   #include <asm/pgalloc.h>
>>   #include <asm/asm-prototypes.h>
>> +#include <asm/security_features.h>
>>   
>>   #include "setup.h"
>>   
>> @@ -949,8 +950,8 @@ static bool no_rfi_flush;
>>   static bool no_entry_flush;
>>   static bool no_uaccess_flush;
>>   bool rfi_flush;
>> -bool entry_flush;
>> -bool uaccess_flush;
>> +static bool entry_flush;
>> +static bool uaccess_flush;
>>   DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
>>   EXPORT_SYMBOL(uaccess_flush_key);
>>   
>> -- 
>> 2.17.1
> .

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[Daniel Axtens]

"heying (H)" <heying24@huawei.com> writes:

> Thank you for your reply.
>
>
> 在 2021/3/17 11:04, Daniel Axtens 写道:
>> Hi He Ying,
>>
>> Thank you for this patch.
>>
>> I'm not sure what the precise rules for Fixes are, but I wonder if this
>> should have:
>>
>> Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
>> Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")
>
> Is that necessary for warning cleanups? I thought 'Fixes' tags are 
> needed only for
>
> bugfix patches. Can someone tell me whether I am right?

Yeah, I'm not sure either. Hopefully mpe will let us know.

Kind regards,
Daniel

>
>>
>> Those are the commits that added the entry_flush and uaccess_flush
>> symbols. Perhaps one for rfi_flush too but I'm not sure what commit
>> introduced that.
>>
>> Kind regards,
>> Daniel
>>
>>> warning: symbol 'rfi_flush' was not declared.
>>> warning: symbol 'entry_flush' was not declared.
>>> warning: symbol 'uaccess_flush' was not declared.
>>> We found warnings above in arch/powerpc/kernel/setup_64.c by using
>>> sparse tool.
>>>
>>> Define 'entry_flush' and 'uaccess_flush' as static because they are not
>>> referenced outside the file. Include asm/security_features.h in which
>>> 'rfi_flush' is declared.
>>>
>>> Reported-by: Hulk Robot <hulkci@huawei.com>
>>> Signed-off-by: He Ying <heying24@huawei.com>
>>> ---
>>>   arch/powerpc/kernel/setup_64.c | 5 +++--
>>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
>>> index 560ed8b975e7..f92d72a7e7ce 100644
>>> --- a/arch/powerpc/kernel/setup_64.c
>>> +++ b/arch/powerpc/kernel/setup_64.c
>>> @@ -68,6 +68,7 @@
>>>   #include <asm/early_ioremap.h>
>>>   #include <asm/pgalloc.h>
>>>   #include <asm/asm-prototypes.h>
>>> +#include <asm/security_features.h>
>>>   
>>>   #include "setup.h"
>>>   
>>> @@ -949,8 +950,8 @@ static bool no_rfi_flush;
>>>   static bool no_entry_flush;
>>>   static bool no_uaccess_flush;
>>>   bool rfi_flush;
>>> -bool entry_flush;
>>> -bool uaccess_flush;
>>> +static bool entry_flush;
>>> +static bool uaccess_flush;
>>>   DEFINE_STATIC_KEY_FALSE(uaccess_flush_key);
>>>   EXPORT_SYMBOL(uaccess_flush_key);
>>>   
>>> -- 
>>> 2.17.1
>> .

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[Michael Ellerman]

Daniel Axtens <dja@axtens.net> writes:
> "heying (H)" <heying24@huawei.com> writes:
>
>> Thank you for your reply.
>>
>> 在 2021/3/17 11:04, Daniel Axtens 写道:
>>> Hi He Ying,
>>>
>>> Thank you for this patch.
>>>
>>> I'm not sure what the precise rules for Fixes are, but I wonder if this
>>> should have:
>>>
>>> Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
>>> Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")
>>
>> Is that necessary for warning cleanups? I thought 'Fixes' tags are 
>> needed only for
>>
>> bugfix patches. Can someone tell me whether I am right?
>
> Yeah, I'm not sure either. Hopefully mpe will let us know.

It's not necessary to add a Fixes tag for a patch like this, but you can
add one if you think it's important that the fix gets backported.

I don't think the cleanups in this case are that important, so I
wouldn't bother with a Fixes tag.

cheers

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[heying (H)]

在 2021/3/17 19:57, Michael Ellerman 写道:
> Daniel Axtens <dja@axtens.net> writes:
>> "heying (H)" <heying24@huawei.com> writes:
>>
>>> Thank you for your reply.
>>>
>>> 在 2021/3/17 11:04, Daniel Axtens 写道:
>>>> Hi He Ying,
>>>>
>>>> Thank you for this patch.
>>>>
>>>> I'm not sure what the precise rules for Fixes are, but I wonder if this
>>>> should have:
>>>>
>>>> Fixes: 9a32a7e78bd0 ("powerpc/64s: flush L1D after user accesses")
>>>> Fixes: f79643787e0a ("powerpc/64s: flush L1D on kernel entry")
>>> Is that necessary for warning cleanups? I thought 'Fixes' tags are
>>> needed only for
>>>
>>> bugfix patches. Can someone tell me whether I am right?
>> Yeah, I'm not sure either. Hopefully mpe will let us know.
> It's not necessary to add a Fixes tag for a patch like this, but you can
> add one if you think it's important that the fix gets backported.
>
> I don't think the cleanups in this case are that important, so I
> wouldn't bother with a Fixes tag.
Okay. That's a good explanation to me. Thanks.

Re: [PATCH] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings

[Michael Ellerman]

On Tue, 16 Mar 2021 00:11:48 -0400, He Ying wrote:
> warning: symbol 'rfi_flush' was not declared.
> warning: symbol 'entry_flush' was not declared.
> warning: symbol 'uaccess_flush' was not declared.
> We found warnings above in arch/powerpc/kernel/setup_64.c by using
> sparse tool.
> 
> Define 'entry_flush' and 'uaccess_flush' as static because they are not
> referenced outside the file. Include asm/security_features.h in which
> 'rfi_flush' is declared.

Applied to powerpc/next.

[1/1] powerpc: arch/powerpc/kernel/setup_64.c - cleanup warnings
      https://git.kernel.org/powerpc/c/d2313da4ff56bd631a3afe7a17992ed5bd0e04a6

cheers