From 7208474d1c7af9f86dfb1f20bfa2abbe22ad2017 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Tue, 22 Oct 2019 10:16:48 -0700 Subject: [PATCH] dmaengine: fsl-dpaa2-qdma: Remove unnecessary local variables in DPDMAI_CMD_CREATE macro Clang warns: drivers/dma/fsl-dpaa2-qdma/dpdmai.c:148:25: warning: variable 'cfg' is uninitialized when used within its own initialization [-Wuninitialized] DPDMAI_CMD_CREATE(cmd, cfg); ~~~~~~~~~~~~~~~~~~~~~~~^~~~ drivers/dma/fsl-dpaa2-qdma/dpdmai.c:42:24: note: expanded from macro 'DPDMAI_CMD_CREATE' typeof(_cfg) (cfg) = (_cfg); \ ~~~ ^~~~ 1 warning generated. Looking at the preprocessed source, we can see that this is true. int dpdmai_create(struct fsl_mc_io *mc_io, u32 cmd_flags, const struct dpdmai_cfg *cfg, u16 *token) { struct fsl_mc_command cmd = { 0 }; int err; cmd.header = mc_encode_cmd_header((((0x90E) << 4) | 0), cmd_flags, 0); do { typeof(cmd)(cmd) = (cmd); typeof(cfg)(cfg) = (cfg); ((cmd).params[0] |= mc_enc((8), (8), (cfg)->priorities[0])); ((cmd).params[0] |= mc_enc((16), (8), (cfg)->priorities[1])); } while (0); I cannot see a good reason to create another version of cfg when the parameter one will work perfectly fine and cmd can just be used as is. Remove them to fix this warning. Fixes: f2835adf8afb ("dmaengine: fsl-dpaa2-qdma: Add the DPDMAI(Data Path DMA Interface) support") Link: https://github.com/ClangBuiltLinux/linux/issues/746 Signed-off-by: Nathan Chancellor Link: https://lore.kernel.org/r/20191022171648.37732-1-natechancellor@gmail.com Signed-off-by: Vinod Koul --- drivers/dma/fsl-dpaa2-qdma/dpdmai.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/dma/fsl-dpaa2-qdma/dpdmai.c b/drivers/dma/fsl-dpaa2-qdma/dpdmai.c index f8a1f663145b7..f8d22115154a1 100644 --- a/drivers/dma/fsl-dpaa2-qdma/dpdmai.c +++ b/drivers/dma/fsl-dpaa2-qdma/dpdmai.c @@ -37,10 +37,8 @@ struct dpdmai_rsp_get_tx_queue { ((_cmd).params[_param] |= mc_enc((_offset), (_width), _arg)) /* cmd, param, offset, width, type, arg_name */ -#define DPDMAI_CMD_CREATE(_cmd, _cfg) \ +#define DPDMAI_CMD_CREATE(cmd, cfg) \ do { \ - typeof(_cmd) (cmd) = (_cmd); \ - typeof(_cfg) (cfg) = (_cfg); \ MC_CMD_OP(cmd, 0, 8, 8, u8, (cfg)->priorities[0]);\ MC_CMD_OP(cmd, 0, 16, 8, u8, (cfg)->priorities[1]);\ } while (0) -- 2.30.2