| Message ID | 20240219155939.611237-1-Frank.Li@nxp.com (mailing list archive) |
|---|---|
| State | Changes Requested |
| Headers | show |
| Series | [v2,1/1] dmaengine: fsl-qdma: add __iomem and struct in union to fix sparse warning | expand |
On 19-02-24, 10:59, Frank Li wrote: > Fix below sparse warnings. This does not apply for me, can you rebase > > drivers/dma/fsl-qdma.c:645:50: sparse: warning: incorrect type in argument 2 (different address spaces) > drivers/dma/fsl-qdma.c:645:50: sparse: expected void [noderef] __iomem *addr > drivers/dma/fsl-qdma.c:645:50: sparse: got void > > drivers/dma/fsl-qdma.c:387:15: sparse: sparse: restricted __le32 degrades to integer > drivers/dma/fsl-qdma.c:390:19: sparse: expected restricted __le64 [usertype] data > drivers/dma/fsl-qdma.c:392:13: sparse: expected unsigned int [assigned] [usertype] cmd > > QDMA decriptor have below 3 kind formats. (little endian) > > Compound Command Descriptor Format > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > ├──────┼─┴─┼─┴─┴─┼─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ > │ 0x0C │DD │ - │QUEUE│ - │ ADDR │ > ├──────┼───┴─────┴─────┴───────────────────────────────┴───────────────┤ > │ 0x08 │ ADDR │ > ├──────┼─────┬─────────────────┬───────────────────────────────────────┤ > │ 0x04 │ FMT │ OFFSET │ - │ > ├──────┼─┬─┬─┴─────────────────┴───────────────────────┬───────────────┤ > │ │ │S│ │ │ > │ 0x00 │-│E│ - │ STATUS │ > │ │ │R│ │ │ > └──────┴─┴─┴───────────────────────────────────────────┴───────────────┘ > > Compound S/G Table Entry Format > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ > │ 0x0C │ - │ ADDR │ > ├──────┼───────────────────────────────────────────────┴───────────────┤ > │ 0x08 │ ADDR │ > ├──────┼─┬─┬───────────────────────────────────────────────────────────┤ > │ 0x04 │E│F│ LENGTH │ > ├──────┼─┴─┴─────────────────────────────────┬─────────────────────────┤ > │ 0x00 │ - │ OFFSET │ > └──────┴─────────────────────────────────────┴─────────────────────────┘ > > Source/Destination Descriptor Format > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┤ > │ 0x0C │ CMD │ > ├──────┼───────────────────────────────────────────────────────────────┤ > │ 0x08 │ - │ > ├──────┼───────────────┬───────────────────────┬───────────────────────┤ > │ 0x04 │ - │ S[D]SS │ S[D]SD │ > ├──────┼───────────────┴───────────────────────┴───────────────────────┤ > │ 0x00 │ - │ > └──────┴───────────────────────────────────────────────────────────────┘ > > Previous code use 64bit 'data' map to 0x8 and 0xC. In little endian system > CMD is high part of 64bit 'data'. It is correct by left shift 32. But in > big endian system, shift left 32 will write to 0x8 position. Sparse detect > this problem. > > Add below field ot match 'Source/Destination Descriptor Format'. > struct { > __le32 __reserved2; > __le32 cmd; > } __packed; > > Using ddf(sdf)->cmd save to correct posistion regardless endian. > > Reported-by: kernel test robot <lkp@intel.com> > Closes: https://lore.kernel.org/oe-kbuild-all/202402081929.mggOTHaZ-lkp@intel.com/ > Signed-off-by: Frank Li <Frank.Li@nxp.com> > --- > > Notes: > Change from v1 to v2 > - update commit message to show why add 'cmd' > > fsl-edma-common.c's build warning should not cause by this driver. which is > difference drivers. This driver will not use any code related with > fsl-edma-common.c. > > drivers/dma/fsl-qdma.c | 21 ++++++++++----------- > 1 file changed, 10 insertions(+), 11 deletions(-) > > diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c > index 1e3bf6f30f784..5005e138fc239 100644 > --- a/drivers/dma/fsl-qdma.c > +++ b/drivers/dma/fsl-qdma.c > @@ -161,6 +161,10 @@ struct fsl_qdma_format { > u8 __reserved1[2]; > u8 cfg8b_w1; > } __packed; > + struct { > + __le32 __reserved2; > + __le32 cmd; > + } __packed; > __le64 data; > }; > } __packed; > @@ -355,7 +359,6 @@ static void fsl_qdma_free_chan_resources(struct dma_chan *chan) > static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, > dma_addr_t dst, dma_addr_t src, u32 len) > { > - u32 cmd; > struct fsl_qdma_format *sdf, *ddf; > struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest; > > @@ -384,15 +387,11 @@ static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, > /* This entry is the last entry. */ > qdma_csgf_set_f(csgf_dest, len); > /* Descriptor Buffer */ > - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << > - FSL_QDMA_CMD_RWTTYPE_OFFSET) | > - FSL_QDMA_CMD_PF; > - sdf->data = QDMA_SDDF_CMD(cmd); > - > - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << > - FSL_QDMA_CMD_RWTTYPE_OFFSET); > - cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET); > - ddf->data = QDMA_SDDF_CMD(cmd); > + sdf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | > + FSL_QDMA_CMD_PF); > + > + ddf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | > + (FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET)); > } > > /* > @@ -626,7 +625,7 @@ static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma) > > static int > fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma, > - void *block, > + __iomem void *block, > int id) > { > bool duplicate; > -- > 2.34.1
On Thu, Feb 22, 2024 at 07:30:59PM +0530, Vinod Koul wrote: > On 19-02-24, 10:59, Frank Li wrote: > > Fix below sparse warnings. > > This does not apply for me, can you rebase Which branch do you try to apply? This one is fix warnings in "fixes" branch, commit https://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine.git/commit/?h=fixes&id=9d739bccf261dd93ec1babf82f5c5d71dd4caa3e Frank > > > > > drivers/dma/fsl-qdma.c:645:50: sparse: warning: incorrect type in argument 2 (different address spaces) > > drivers/dma/fsl-qdma.c:645:50: sparse: expected void [noderef] __iomem *addr > > drivers/dma/fsl-qdma.c:645:50: sparse: got void > > > > drivers/dma/fsl-qdma.c:387:15: sparse: sparse: restricted __le32 degrades to integer > > drivers/dma/fsl-qdma.c:390:19: sparse: expected restricted __le64 [usertype] data > > drivers/dma/fsl-qdma.c:392:13: sparse: expected unsigned int [assigned] [usertype] cmd > > > > QDMA decriptor have below 3 kind formats. (little endian) > > > > Compound Command Descriptor Format > > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > > ├──────┼─┴─┼─┴─┴─┼─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ > > │ 0x0C │DD │ - │QUEUE│ - │ ADDR │ > > ├──────┼───┴─────┴─────┴───────────────────────────────┴───────────────┤ > > │ 0x08 │ ADDR │ > > ├──────┼─────┬─────────────────┬───────────────────────────────────────┤ > > │ 0x04 │ FMT │ OFFSET │ - │ > > ├──────┼─┬─┬─┴─────────────────┴───────────────────────┬───────────────┤ > > │ │ │S│ │ │ > > │ 0x00 │-│E│ - │ STATUS │ > > │ │ │R│ │ │ > > └──────┴─┴─┴───────────────────────────────────────────┴───────────────┘ > > > > Compound S/G Table Entry Format > > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > > ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ > > │ 0x0C │ - │ ADDR │ > > ├──────┼───────────────────────────────────────────────┴───────────────┤ > > │ 0x08 │ ADDR │ > > ├──────┼─┬─┬───────────────────────────────────────────────────────────┤ > > │ 0x04 │E│F│ LENGTH │ > > ├──────┼─┴─┴─────────────────────────────────┬─────────────────────────┤ > > │ 0x00 │ - │ OFFSET │ > > └──────┴─────────────────────────────────────┴─────────────────────────┘ > > > > Source/Destination Descriptor Format > > ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ > > │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ > > │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ > > ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┤ > > │ 0x0C │ CMD │ > > ├──────┼───────────────────────────────────────────────────────────────┤ > > │ 0x08 │ - │ > > ├──────┼───────────────┬───────────────────────┬───────────────────────┤ > > │ 0x04 │ - │ S[D]SS │ S[D]SD │ > > ├──────┼───────────────┴───────────────────────┴───────────────────────┤ > > │ 0x00 │ - │ > > └──────┴───────────────────────────────────────────────────────────────┘ > > > > Previous code use 64bit 'data' map to 0x8 and 0xC. In little endian system > > CMD is high part of 64bit 'data'. It is correct by left shift 32. But in > > big endian system, shift left 32 will write to 0x8 position. Sparse detect > > this problem. > > > > Add below field ot match 'Source/Destination Descriptor Format'. > > struct { > > __le32 __reserved2; > > __le32 cmd; > > } __packed; > > > > Using ddf(sdf)->cmd save to correct posistion regardless endian. > > > > Reported-by: kernel test robot <lkp@intel.com> > > Closes: https://lore.kernel.org/oe-kbuild-all/202402081929.mggOTHaZ-lkp@intel.com/ > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > > --- > > > > Notes: > > Change from v1 to v2 > > - update commit message to show why add 'cmd' > > > > fsl-edma-common.c's build warning should not cause by this driver. which is > > difference drivers. This driver will not use any code related with > > fsl-edma-common.c. > > > > drivers/dma/fsl-qdma.c | 21 ++++++++++----------- > > 1 file changed, 10 insertions(+), 11 deletions(-) > > > > diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c > > index 1e3bf6f30f784..5005e138fc239 100644 > > --- a/drivers/dma/fsl-qdma.c > > +++ b/drivers/dma/fsl-qdma.c > > @@ -161,6 +161,10 @@ struct fsl_qdma_format { > > u8 __reserved1[2]; > > u8 cfg8b_w1; > > } __packed; > > + struct { > > + __le32 __reserved2; > > + __le32 cmd; > > + } __packed; > > __le64 data; > > }; > > } __packed; > > @@ -355,7 +359,6 @@ static void fsl_qdma_free_chan_resources(struct dma_chan *chan) > > static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, > > dma_addr_t dst, dma_addr_t src, u32 len) > > { > > - u32 cmd; > > struct fsl_qdma_format *sdf, *ddf; > > struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest; > > > > @@ -384,15 +387,11 @@ static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, > > /* This entry is the last entry. */ > > qdma_csgf_set_f(csgf_dest, len); > > /* Descriptor Buffer */ > > - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << > > - FSL_QDMA_CMD_RWTTYPE_OFFSET) | > > - FSL_QDMA_CMD_PF; > > - sdf->data = QDMA_SDDF_CMD(cmd); > > - > > - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << > > - FSL_QDMA_CMD_RWTTYPE_OFFSET); > > - cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET); > > - ddf->data = QDMA_SDDF_CMD(cmd); > > + sdf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | > > + FSL_QDMA_CMD_PF); > > + > > + ddf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | > > + (FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET)); > > } > > > > /* > > @@ -626,7 +625,7 @@ static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma) > > > > static int > > fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma, > > - void *block, > > + __iomem void *block, > > int id) > > { > > bool duplicate; > > -- > > 2.34.1 > > -- > ~Vinod
On 22-02-24, 19:30, Vinod Koul wrote: > On 19-02-24, 10:59, Frank Li wrote: > > Fix below sparse warnings. > > This does not apply for me, can you rebase Nevermind I had issues in my local branch, this works
On Mon, 19 Feb 2024 10:59:39 -0500, Frank Li wrote: > Fix below sparse warnings. > > drivers/dma/fsl-qdma.c:645:50: sparse: warning: incorrect type in argument 2 (different address spaces) > drivers/dma/fsl-qdma.c:645:50: sparse: expected void [noderef] __iomem *addr > drivers/dma/fsl-qdma.c:645:50: sparse: got void > > drivers/dma/fsl-qdma.c:387:15: sparse: sparse: restricted __le32 degrades to integer > drivers/dma/fsl-qdma.c:390:19: sparse: expected restricted __le64 [usertype] data > drivers/dma/fsl-qdma.c:392:13: sparse: expected unsigned int [assigned] [usertype] cmd > > [...] Applied, thanks! [1/1] dmaengine: fsl-qdma: add __iomem and struct in union to fix sparse warning commit: 1878840a0328dac1c85d29fee31456ec26fcc01c Best regards,
diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c index 1e3bf6f30f784..5005e138fc239 100644 --- a/drivers/dma/fsl-qdma.c +++ b/drivers/dma/fsl-qdma.c @@ -161,6 +161,10 @@ struct fsl_qdma_format { u8 __reserved1[2]; u8 cfg8b_w1; } __packed; + struct { + __le32 __reserved2; + __le32 cmd; + } __packed; __le64 data; }; } __packed; @@ -355,7 +359,6 @@ static void fsl_qdma_free_chan_resources(struct dma_chan *chan) static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, dma_addr_t dst, dma_addr_t src, u32 len) { - u32 cmd; struct fsl_qdma_format *sdf, *ddf; struct fsl_qdma_format *ccdf, *csgf_desc, *csgf_src, *csgf_dest; @@ -384,15 +387,11 @@ static void fsl_qdma_comp_fill_memcpy(struct fsl_qdma_comp *fsl_comp, /* This entry is the last entry. */ qdma_csgf_set_f(csgf_dest, len); /* Descriptor Buffer */ - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << - FSL_QDMA_CMD_RWTTYPE_OFFSET) | - FSL_QDMA_CMD_PF; - sdf->data = QDMA_SDDF_CMD(cmd); - - cmd = cpu_to_le32(FSL_QDMA_CMD_RWTTYPE << - FSL_QDMA_CMD_RWTTYPE_OFFSET); - cmd |= cpu_to_le32(FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET); - ddf->data = QDMA_SDDF_CMD(cmd); + sdf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | + FSL_QDMA_CMD_PF); + + ddf->cmd = cpu_to_le32((FSL_QDMA_CMD_RWTTYPE << FSL_QDMA_CMD_RWTTYPE_OFFSET) | + (FSL_QDMA_CMD_LWC << FSL_QDMA_CMD_LWC_OFFSET)); } /* @@ -626,7 +625,7 @@ static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma) static int fsl_qdma_queue_transfer_complete(struct fsl_qdma_engine *fsl_qdma, - void *block, + __iomem void *block, int id) { bool duplicate;
Fix below sparse warnings. drivers/dma/fsl-qdma.c:645:50: sparse: warning: incorrect type in argument 2 (different address spaces) drivers/dma/fsl-qdma.c:645:50: sparse: expected void [noderef] __iomem *addr drivers/dma/fsl-qdma.c:645:50: sparse: got void drivers/dma/fsl-qdma.c:387:15: sparse: sparse: restricted __le32 degrades to integer drivers/dma/fsl-qdma.c:390:19: sparse: expected restricted __le64 [usertype] data drivers/dma/fsl-qdma.c:392:13: sparse: expected unsigned int [assigned] [usertype] cmd QDMA decriptor have below 3 kind formats. (little endian) Compound Command Descriptor Format ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ ├──────┼─┴─┼─┴─┴─┼─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ │ 0x0C │DD │ - │QUEUE│ - │ ADDR │ ├──────┼───┴─────┴─────┴───────────────────────────────┴───────────────┤ │ 0x08 │ ADDR │ ├──────┼─────┬─────────────────┬───────────────────────────────────────┤ │ 0x04 │ FMT │ OFFSET │ - │ ├──────┼─┬─┬─┴─────────────────┴───────────────────────┬───────────────┤ │ │ │S│ │ │ │ 0x00 │-│E│ - │ STATUS │ │ │ │R│ │ │ └──────┴─┴─┴───────────────────────────────────────────┴───────────────┘ Compound S/G Table Entry Format ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┼─┴─┴─┴─┴─┴─┴─┴─┤ │ 0x0C │ - │ ADDR │ ├──────┼───────────────────────────────────────────────┴───────────────┤ │ 0x08 │ ADDR │ ├──────┼─┬─┬───────────────────────────────────────────────────────────┤ │ 0x04 │E│F│ LENGTH │ ├──────┼─┴─┴─────────────────────────────────┬─────────────────────────┤ │ 0x00 │ - │ OFFSET │ └──────┴─────────────────────────────────────┴─────────────────────────┘ Source/Destination Descriptor Format ┌──────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐ │Offset│3│3│2│2│2│2│2│2│2│2│2│2│1│1│1│1│1│1│1│1│1│1│ │ │ │ │ │ │ │ │ │ │ │ │1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│9│8│7│6│5│4│3│2│1│0│ ├──────┼─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┤ │ 0x0C │ CMD │ ├──────┼───────────────────────────────────────────────────────────────┤ │ 0x08 │ - │ ├──────┼───────────────┬───────────────────────┬───────────────────────┤ │ 0x04 │ - │ S[D]SS │ S[D]SD │ ├──────┼───────────────┴───────────────────────┴───────────────────────┤ │ 0x00 │ - │ └──────┴───────────────────────────────────────────────────────────────┘ Previous code use 64bit 'data' map to 0x8 and 0xC. In little endian system CMD is high part of 64bit 'data'. It is correct by left shift 32. But in big endian system, shift left 32 will write to 0x8 position. Sparse detect this problem. Add below field ot match 'Source/Destination Descriptor Format'. struct { __le32 __reserved2; __le32 cmd; } __packed; Using ddf(sdf)->cmd save to correct posistion regardless endian. Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202402081929.mggOTHaZ-lkp@intel.com/ Signed-off-by: Frank Li <Frank.Li@nxp.com> --- Notes: Change from v1 to v2 - update commit message to show why add 'cmd' fsl-edma-common.c's build warning should not cause by this driver. which is difference drivers. This driver will not use any code related with fsl-edma-common.c. drivers/dma/fsl-qdma.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-)