Re: [PATCH -next v2] powerpc/mpic_msgr: fix cast removes address space of expression warnings
From: Christophe Leroy <hidden>
Date: 2022-11-02 08:34:27
Also in:
lkml
Le 19/10/2022 à 08:34, ruanjinjie a écrit :
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 instead of using a type cast, change the size of the pointer offset to fix these warnings. Signed-off-by: ruanjinjie <redacted>
Reviewed-by: Christophe Leroy <redacted>
quoted hunk ↗ jump to hunk
--- v2: - change the macro of MPIC_MSGR_MER_OFFSET to avoid type cast and simplify the fix --- arch/powerpc/sysdev/mpic_msgr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)diff --git a/arch/powerpc/sysdev/mpic_msgr.c b/arch/powerpc/sysdev/mpic_msgr.c index a439e33eae06..d75064fb7d12 100644 --- a/arch/powerpc/sysdev/mpic_msgr.c +++ b/arch/powerpc/sysdev/mpic_msgr.c@@ -20,7 +20,7 @@ #define MPIC_MSGR_REGISTERS_PER_BLOCK 4 #define MPIC_MSGR_STRIDE 0x10 -#define MPIC_MSGR_MER_OFFSET 0x100 +#define MPIC_MSGR_MER_OFFSET (0x100 / sizeof(u32)) #define MSGR_INUSE 0 #define MSGR_FREE 1@@ -234,7 +234,7 @@ 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 = msgr->base + MPIC_MSGR_MER_OFFSET; msgr->in_use = MSGR_FREE; msgr->num = i; raw_spin_lock_init(&msgr->lock);