* [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings
@ 2022-09-01 8:54 ruanjinjie
2022-09-30 1:34 ` Ruan Jinjie
2022-09-30 6:09 ` Christophe Leroy
0 siblings, 2 replies; 5+ messages in thread
From: ruanjinjie @ 2022-09-01 8:54 UTC (permalink / raw)
To: mpe, npiggin, christophe.leroy, joel, Julia.Lawall, linuxppc-dev,
linux-kernel
Cc: ruanjinjie
When build Linux kernel, encounter the following warnings:
./arch/powerpc/sysdev/mpic_msgr.c:230:38: warning: cast removes address space '__iomem' of expression
./arch/powerpc/sysdev/mpic_msgr.c:230:27: warning: incorrect type in assignment (different address spaces)
The data type of msgr->mer and msgr->base are 'u32 __iomem *', but
converted to 'u32 *' and 'u8 *' directly and cause above warnings, now
recover their data types to fix these warnings.
Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
---
arch/powerpc/sysdev/mpic_msgr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
index 698fefaaa6dd..cbb0d24f15ba 100644
--- a/arch/powerpc/sysdev/mpic_msgr.c
+++ b/arch/powerpc/sysdev/mpic_msgr.c
@@ -227,7 +227,7 @@ static int mpic_msgr_probe(struct platform_device *dev)
reg_number = block_number * MPIC_MSGR_REGISTERS_PER_BLOCK + i;
msgr->base = msgr_block_addr + i * MPIC_MSGR_STRIDE;
- msgr->mer = (u32 *)((u8 *)msgr->base + MPIC_MSGR_MER_OFFSET);
+ msgr->mer = (u32 __iomem *)((u8 __iomem *)msgr->base + MPIC_MSGR_MER_OFFSET);
msgr->in_use = MSGR_FREE;
msgr->num = i;
raw_spin_lock_init(&msgr->lock);
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings
2022-09-01 8:54 [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings ruanjinjie
@ 2022-09-30 1:34 ` Ruan Jinjie
2022-09-30 6:09 ` Christophe Leroy
1 sibling, 0 replies; 5+ messages in thread
From: Ruan Jinjie @ 2022-09-30 1:34 UTC (permalink / raw)
To: mpe, npiggin, christophe.leroy, joel, Julia.Lawall, linuxppc-dev,
linux-kernel
Ping.
On 2022/9/1 16:54, ruanjinjie wrote:
> When build Linux kernel, encounter the following warnings:
>
> ./arch/powerpc/sysdev/mpic_msgr.c:230:38: warning: cast removes address space '__iomem' of expression
> ./arch/powerpc/sysdev/mpic_msgr.c:230:27: warning: incorrect type in assignment (different address spaces)
>
> The data type of msgr->mer and msgr->base are 'u32 __iomem *', but
> converted to 'u32 *' and 'u8 *' directly and cause above warnings, now
> recover their data types to fix these warnings.
>
> Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
> ---
> arch/powerpc/sysdev/mpic_msgr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
> index 698fefaaa6dd..cbb0d24f15ba 100644
> --- a/arch/powerpc/sysdev/mpic_msgr.c
> +++ b/arch/powerpc/sysdev/mpic_msgr.c
> @@ -227,7 +227,7 @@ static int mpic_msgr_probe(struct platform_device *dev)
>
> reg_number = block_number * MPIC_MSGR_REGISTERS_PER_BLOCK + i;
> msgr->base = msgr_block_addr + i * MPIC_MSGR_STRIDE;
> - msgr->mer = (u32 *)((u8 *)msgr->base + MPIC_MSGR_MER_OFFSET);
> + msgr->mer = (u32 __iomem *)((u8 __iomem *)msgr->base + MPIC_MSGR_MER_OFFSET);
> msgr->in_use = MSGR_FREE;
> msgr->num = i;
> raw_spin_lock_init(&msgr->lock);
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings
2022-09-01 8:54 [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings ruanjinjie
2022-09-30 1:34 ` Ruan Jinjie
@ 2022-09-30 6:09 ` Christophe Leroy
2022-09-30 6:37 ` Ruan Jinjie
2022-09-30 7:25 ` Michael Ellerman
1 sibling, 2 replies; 5+ messages in thread
From: Christophe Leroy @ 2022-09-30 6:09 UTC (permalink / raw)
To: ruanjinjie, mpe, npiggin, joel, Julia.Lawall, linuxppc-dev, linux-kernel
Le 01/09/2022 à 10:54, ruanjinjie a écrit :
> [Vous ne recevez pas souvent de courriers de ruanjinjie@huawei.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
>
> When build Linux kernel, encounter the following warnings:
>
> ./arch/powerpc/sysdev/mpic_msgr.c:230:38: warning: cast removes address space '__iomem' of expression
> ./arch/powerpc/sysdev/mpic_msgr.c:230:27: warning: incorrect type in assignment (different address spaces)
>
> The data type of msgr->mer and msgr->base are 'u32 __iomem *', but
> converted to 'u32 *' and 'u8 *' directly and cause above warnings, now
> recover their data types to fix these warnings.
I think the best would be to change MPIC_MSGR_MER_OFFSET to 0x40 and
then drop the casts completely:
msgr->mer = msgr->base + MPIC_MSGR_MER_OFFSET;
>
> Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
> ---
> arch/powerpc/sysdev/mpic_msgr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
> index 698fefaaa6dd..cbb0d24f15ba 100644
> --- a/arch/powerpc/sysdev/mpic_msgr.c
> +++ b/arch/powerpc/sysdev/mpic_msgr.c
> @@ -227,7 +227,7 @@ static int mpic_msgr_probe(struct platform_device *dev)
>
> reg_number = block_number * MPIC_MSGR_REGISTERS_PER_BLOCK + i;
> msgr->base = msgr_block_addr + i * MPIC_MSGR_STRIDE;
> - msgr->mer = (u32 *)((u8 *)msgr->base + MPIC_MSGR_MER_OFFSET);
> + msgr->mer = (u32 __iomem *)((u8 __iomem *)msgr->base + MPIC_MSGR_MER_OFFSET);
> msgr->in_use = MSGR_FREE;
> msgr->num = i;
> raw_spin_lock_init(&msgr->lock);
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings
2022-09-30 6:09 ` Christophe Leroy
@ 2022-09-30 6:37 ` Ruan Jinjie
2022-09-30 7:25 ` Michael Ellerman
1 sibling, 0 replies; 5+ messages in thread
From: Ruan Jinjie @ 2022-09-30 6:37 UTC (permalink / raw)
To: Christophe Leroy, mpe, npiggin, joel, Julia.Lawall, linuxppc-dev,
linux-kernel
On 2022/9/30 14:09, Christophe Leroy wrote:
>
>
> Le 01/09/2022 à 10:54, ruanjinjie a écrit :
>> [Vous ne recevez pas souvent de courriers de ruanjinjie@huawei.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
>>
>> When build Linux kernel, encounter the following warnings:
>>
>> ./arch/powerpc/sysdev/mpic_msgr.c:230:38: warning: cast removes address space '__iomem' of expression
>> ./arch/powerpc/sysdev/mpic_msgr.c:230:27: warning: incorrect type in assignment (different address spaces)
>>
>> The data type of msgr->mer and msgr->base are 'u32 __iomem *', but
>> converted to 'u32 *' and 'u8 *' directly and cause above warnings, now
>> recover their data types to fix these warnings.
>
> I think the best would be to change MPIC_MSGR_MER_OFFSET to 0x40 and
> then drop the casts completely:
>
> msgr->mer = msgr->base + MPIC_MSGR_MER_OFFSET;
>
I think this is good to solve the warning.
>>
>> Signed-off-by: ruanjinjie <ruanjinjie@huawei.com>
>> ---
>> arch/powerpc/sysdev/mpic_msgr.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c
>> index 698fefaaa6dd..cbb0d24f15ba 100644
>> --- a/arch/powerpc/sysdev/mpic_msgr.c
>> +++ b/arch/powerpc/sysdev/mpic_msgr.c
>> @@ -227,7 +227,7 @@ static int mpic_msgr_probe(struct platform_device *dev)
>>
>> reg_number = block_number * MPIC_MSGR_REGISTERS_PER_BLOCK + i;
>> msgr->base = msgr_block_addr + i * MPIC_MSGR_STRIDE;
>> - msgr->mer = (u32 *)((u8 *)msgr->base + MPIC_MSGR_MER_OFFSET);
>> + msgr->mer = (u32 __iomem *)((u8 __iomem *)msgr->base + MPIC_MSGR_MER_OFFSET);
>> msgr->in_use = MSGR_FREE;
>> msgr->num = i;
>> raw_spin_lock_init(&msgr->lock);
>> --
>> 2.25.1
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings
2022-09-30 6:09 ` Christophe Leroy
2022-09-30 6:37 ` Ruan Jinjie
@ 2022-09-30 7:25 ` Michael Ellerman
1 sibling, 0 replies; 5+ messages in thread
From: Michael Ellerman @ 2022-09-30 7:25 UTC (permalink / raw)
To: Christophe Leroy, ruanjinjie, npiggin, joel, Julia.Lawall,
linuxppc-dev, linux-kernel
Christophe Leroy <christophe.leroy@csgroup.eu> writes:
> Le 01/09/2022 à 10:54, ruanjinjie a écrit :
>> [Vous ne recevez pas souvent de courriers de ruanjinjie@huawei.com. Découvrez pourquoi ceci est important à https://aka.ms/LearnAboutSenderIdentification ]
>>
>> When build Linux kernel, encounter the following warnings:
>>
>> ./arch/powerpc/sysdev/mpic_msgr.c:230:38: warning: cast removes address space '__iomem' of expression
>> ./arch/powerpc/sysdev/mpic_msgr.c:230:27: warning: incorrect type in assignment (different address spaces)
>>
>> The data type of msgr->mer and msgr->base are 'u32 __iomem *', but
>> converted to 'u32 *' and 'u8 *' directly and cause above warnings, now
>> recover their data types to fix these warnings.
>
> I think the best would be to change MPIC_MSGR_MER_OFFSET to 0x40 and
> then drop the casts completely:
>
> msgr->mer = msgr->base + MPIC_MSGR_MER_OFFSET;
Or:
#define MPIC_MSGR_MER_OFFSET (0x100 / sizeof(u32))
To document that it's 0x100 bytes, but the the offset is in units of u32.
cheers
^ permalink raw reply [flat|nested] 5+ messages in thread
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2022-09-01 8:54 [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings ruanjinjie
2022-09-30 1:34 ` Ruan Jinjie
2022-09-30 6:09 ` Christophe Leroy
2022-09-30 6:37 ` Ruan Jinjie
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