Christophe Leroy [off-list ref] writes:

Le 01/09/2022 à 10:54, ruanjinjie a écrit :

quoted

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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