* [PATCH] x86/platform/olpc: remove duplicated check on node == -1
@ 2018-12-09 15:01 Colin King
2018-12-09 17:10 ` Christophe JAILLET
2018-12-09 17:13 ` Christophe JAILLET
0 siblings, 2 replies; 4+ messages in thread
From: Colin King @ 2018-12-09 15:01 UTC (permalink / raw)
To: Thomas Gleixner, Ingo Molnar, Borislav Petkov, H . Peter Anvin,
x86, Andrew Morton
Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
Currently the node == -1 check is being performed twice, the
second check is redundant and can be removed. Fix this by
removing the redundant second check and moving the first check
into a combined check with the result from the olpc_ofw call.
Detected by cppcheck:
Identical condition '(s32)node==-1', second condition is always false
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
arch/x86/platform/olpc/olpc_dt.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
index b4ab779f1d47..658363ec3ff3 100644
--- a/arch/x86/platform/olpc/olpc_dt.c
+++ b/arch/x86/platform/olpc/olpc_dt.c
@@ -28,10 +28,7 @@ static phandle __init olpc_dt_getsibling(phandle node)
const void *args[] = { (void *)node };
void *res[] = { &node };
- if ((s32)node == -1)
- return 0;
-
- if (olpc_ofw("peer", args, res) || (s32)node == -1)
+ if (((s32)node == -1) || olpc_ofw("peer", args, res))
return 0;
return node;
--
2.19.1
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86/platform/olpc: remove duplicated check on node == -1
2018-12-09 15:01 [PATCH] x86/platform/olpc: remove duplicated check on node == -1 Colin King
@ 2018-12-09 17:10 ` Christophe JAILLET
2018-12-09 17:13 ` Christophe JAILLET
1 sibling, 0 replies; 4+ messages in thread
From: Christophe JAILLET @ 2018-12-09 17:10 UTC (permalink / raw)
To: linux-kernel; +Cc: kernel-janitors
Le 09/12/2018 à 16:01, Colin King a écrit :
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently the node == -1 check is being performed twice, the
> second check is redundant and can be removed. Fix this by
> removing the redundant second check and moving the first check
> into a combined check with the result from the olpc_ofw call.
>
> Detected by cppcheck:
> Identical condition '(s32)node==-1', second condition is always false
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> arch/x86/platform/olpc/olpc_dt.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
> index b4ab779f1d47..658363ec3ff3 100644
> --- a/arch/x86/platform/olpc/olpc_dt.c
> +++ b/arch/x86/platform/olpc/olpc_dt.c
> @@ -28,10 +28,7 @@ static phandle __init olpc_dt_getsibling(phandle node)
> const void *args[] = { (void *)node };
> void *res[] = { &node };
>
> - if ((s32)node == -1)
> - return 0;
> -
> - if (olpc_ofw("peer", args, res) || (s32)node == -1)
> + if (((s32)node == -1) || olpc_ofw("peer", args, res))
> return 0;
>
> return node;
'res' is { &node }
Could 'node' be modified by 'olpc_ofw(..., res)' and set to -1?
In other words, I'm not sure that the 2nd check is a redundant here.
Just my 2c,
CJ
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] x86/platform/olpc: remove duplicated check on node == -1
2018-12-09 15:01 [PATCH] x86/platform/olpc: remove duplicated check on node == -1 Colin King
2018-12-09 17:10 ` Christophe JAILLET
@ 2018-12-09 17:13 ` Christophe JAILLET
2018-12-09 17:30 ` NACK: " Colin Ian King
1 sibling, 1 reply; 4+ messages in thread
From: Christophe JAILLET @ 2018-12-09 17:13 UTC (permalink / raw)
To: Colin King, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
H . Peter Anvin, x86, Andrew Morton
Cc: kernel-janitors, linux-kernel
Le 09/12/2018 à 16:01, Colin King a écrit :
> From: Colin Ian King <colin.king@canonical.com>
>
> Currently the node == -1 check is being performed twice, the
> second check is redundant and can be removed. Fix this by
> removing the redundant second check and moving the first check
> into a combined check with the result from the olpc_ofw call.
>
> Detected by cppcheck:
> Identical condition '(s32)node==-1', second condition is always false
>
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> arch/x86/platform/olpc/olpc_dt.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/arch/x86/platform/olpc/olpc_dt.c b/arch/x86/platform/olpc/olpc_dt.c
> index b4ab779f1d47..658363ec3ff3 100644
> --- a/arch/x86/platform/olpc/olpc_dt.c
> +++ b/arch/x86/platform/olpc/olpc_dt.c
> @@ -28,10 +28,7 @@ static phandle __init olpc_dt_getsibling(phandle node)
> const void *args[] = { (void *)node };
> void *res[] = { &node };
>
> - if ((s32)node == -1)
> - return 0;
> -
> - if (olpc_ofw("peer", args, res) || (s32)node == -1)
> + if (((s32)node == -1) || olpc_ofw("peer", args, res))
> return 0;
>
> return node;
'res' is { &node }
Could 'node' be modified by 'olpc_ofw(..., res)' and set to -1?
In other words, I'm not sure that the 2nd check is a redundant here.
Just my 2c,
CJ
^ permalink raw reply [flat|nested] 4+ messages in thread* NACK: [PATCH] x86/platform/olpc: remove duplicated check on node == -1
2018-12-09 17:13 ` Christophe JAILLET
@ 2018-12-09 17:30 ` Colin Ian King
0 siblings, 0 replies; 4+ messages in thread
From: Colin Ian King @ 2018-12-09 17:30 UTC (permalink / raw)
To: Christophe JAILLET, Thomas Gleixner, Ingo Molnar,
Borislav Petkov, H . Peter Anvin, x86, Andrew Morton
Cc: kernel-janitors, linux-kernel
On 09/12/2018 17:13, Christophe JAILLET wrote:
> Le 09/12/2018 à 16:01, Colin King a écrit :
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Currently the node == -1 check is being performed twice, the
>> second check is redundant and can be removed. Fix this by
>> removing the redundant second check and moving the first check
>> into a combined check with the result from the olpc_ofw call.
>>
>> Detected by cppcheck:
>> Identical condition '(s32)node==-1', second condition is always false
>>
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> arch/x86/platform/olpc/olpc_dt.c | 5 +----
>> 1 file changed, 1 insertion(+), 4 deletions(-)
>>
>> diff --git a/arch/x86/platform/olpc/olpc_dt.c
>> b/arch/x86/platform/olpc/olpc_dt.c
>> index b4ab779f1d47..658363ec3ff3 100644
>> --- a/arch/x86/platform/olpc/olpc_dt.c
>> +++ b/arch/x86/platform/olpc/olpc_dt.c
>> @@ -28,10 +28,7 @@ static phandle __init olpc_dt_getsibling(phandle node)
>> const void *args[] = { (void *)node };
>> void *res[] = { &node };
>> - if ((s32)node == -1)
>> - return 0;
>> -
>> - if (olpc_ofw("peer", args, res) || (s32)node == -1)
>> + if (((s32)node == -1) || olpc_ofw("peer", args, res))
>> return 0;
>> return node;
>
> 'res' is { &node }
>
> Could 'node' be modified by 'olpc_ofw(..., res)' and set to -1?
>
> In other words, I'm not sure that the 2nd check is a redundant here.
Quite right. My mistake. Urgh.
>
> Just my 2c,
>
> CJ
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2018-12-09 17:30 UTC | newest]
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2018-12-09 15:01 [PATCH] x86/platform/olpc: remove duplicated check on node == -1 Colin King
2018-12-09 17:10 ` Christophe JAILLET
2018-12-09 17:13 ` Christophe JAILLET
2018-12-09 17:30 ` NACK: " Colin Ian King
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