Messages in this thread | | | Date | Fri, 30 Sep 2022 14:37:05 +0800 | Subject | Re: [PATCH -next] powerpc/mpic_msgr: fix cast removes address space of expression warnings | From | Ruan Jinjie <> |
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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
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