| Message ID | f618f1fe2d13417ebed185da392fb48811593a9f.1618180660.git.mitaliborkar810@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [1/6] staging: media: intel-ipu3: replace bit shifts with BIT() macro | expand |
Hi Mitali, On Mon, Apr 12, 2021 at 04:38:59AM +0530, Mitali Borkar wrote: > This patch fixes the warning identified by checkpatch.pl by replacing > __attribute__aligned(size) with __aligned(size) Same comments on this than the 1st patch. It's a staging driver so even if this is a user space header, it's not under include/uapi/linux. -- Kind regards, Sakari Ailus
On Mon, Apr 12, 2021 at 12:43:15PM +0300, Sakari Ailus wrote: > Hi Mitali, > > On Mon, Apr 12, 2021 at 04:38:59AM +0530, Mitali Borkar wrote: > > This patch fixes the warning identified by checkpatch.pl by replacing > > __attribute__aligned(size) with __aligned(size) > > Same comments on this than the 1st patch. > > It's a staging driver so even if this is a user space header, it's not > under include/uapi/linux. > Sir, I am not able to understandd what you are trying to say in this. As you mentioned in patch 1/6, I removed and added header where BIT() macro under apprpriate userpace, but what should I modify in this patch? > -- > Kind regards, > > Sakari Ailus > > -- > You received this message because you are subscribed to the Google Groups "outreachy-kernel" group. > To unsubscribe from this group and stop receiving emails from it, send an email to outreachy-kernel+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/outreachy-kernel/20210412094315.GJ3%40paasikivi.fi.intel.com.
Hi Mitali, On Mon, Apr 12, 2021 at 07:59:29PM +0530, Mitali Borkar wrote: > On Mon, Apr 12, 2021 at 12:43:15PM +0300, Sakari Ailus wrote: > > Hi Mitali, > > > > On Mon, Apr 12, 2021 at 04:38:59AM +0530, Mitali Borkar wrote: > > > This patch fixes the warning identified by checkpatch.pl by replacing > > > __attribute__aligned(size) with __aligned(size) > > > > Same comments on this than the 1st patch. > > > > It's a staging driver so even if this is a user space header, it's not > > under include/uapi/linux. > > > Sir, I am not able to understandd what you are trying to say in this. As you > mentioned in patch 1/6, I removed and added header where BIT() macro under > apprpriate userpace, but what should I modify in this patch? The comment on the 1st patch and above was a weird way of saying "please drop patches 1 and 2". BIT(), __aligned() and __packed are macros in kernel headers that generally are not available in headers exported for user space consumption. -- Kind regards, Sakari Ailus
From: Mitali Borkar > Sent: 12 April 2021 00:09 > > This patch fixes the warning identified by checkpatch.pl by replacing > __attribute__aligned(size) with __aligned(size) > > Signed-off-by: Mitali Borkar <mitaliborkar810@gmail.com> > --- > .../staging/media/ipu3/include/intel-ipu3.h | 74 +++++++++---------- > 1 file changed, 37 insertions(+), 37 deletions(-) > > diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h > b/drivers/staging/media/ipu3/include/intel-ipu3.h > index 589d5ccee3a7..d95ca9ebfafb 100644 > --- a/drivers/staging/media/ipu3/include/intel-ipu3.h > +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h > @@ -84,7 +84,7 @@ struct ipu3_uapi_grid_config { > */ > struct ipu3_uapi_awb_raw_buffer { > __u8 meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] > - __attribute__((aligned(32))); > + __aligned(32); > } __packed; WTF? It either has 1-byte alignment because it is just __u8, 32-byte because of the aligned(32), or 1 byte because of the outer packed. What alignment does this (and all the other) structures actually need? Specifying 'packed' isn't free. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
Hi David, On Tue, Apr 13, 2021 at 07:40:12AM +0000, David Laight wrote: > From: Mitali Borkar > > Sent: 12 April 2021 00:09 > > > > This patch fixes the warning identified by checkpatch.pl by replacing > > __attribute__aligned(size) with __aligned(size) > > > > Signed-off-by: Mitali Borkar <mitaliborkar810@gmail.com> > > --- > > .../staging/media/ipu3/include/intel-ipu3.h | 74 +++++++++---------- > > 1 file changed, 37 insertions(+), 37 deletions(-) > > > > diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h > > b/drivers/staging/media/ipu3/include/intel-ipu3.h > > index 589d5ccee3a7..d95ca9ebfafb 100644 > > --- a/drivers/staging/media/ipu3/include/intel-ipu3.h > > +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h > > @@ -84,7 +84,7 @@ struct ipu3_uapi_grid_config { > > */ > > struct ipu3_uapi_awb_raw_buffer { > > __u8 meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] > > - __attribute__((aligned(32))); > > + __aligned(32); > > } __packed; > > WTF? > > It either has 1-byte alignment because it is just __u8, > 32-byte because of the aligned(32), > or 1 byte because of the outer packed. > > What alignment does this (and all the other) structures > actually need? 32 as noted above. Here packed makes no difference though. Some of these structs are used embedded in other structs or alone. I haven't checked this one. It's also possible to have __packed and __aligned() conflict (in which case a decent compiler would give you a warning) --- which does not happen currently AFAIK. > > Specifying 'packed' isn't free. It may be free if the packed alignment of the fields corresponds to architecture's packing. Here __aligned() is used to satisfy hardware alignment requirements and __packed is used to ensure the same memory layout independently of ABI rules. -- Regards, Sakari Ailus
From: sakari.ailus@linux.intel.com > Sent: 13 April 2021 10:56 > > Hi David, > > On Tue, Apr 13, 2021 at 07:40:12AM +0000, David Laight wrote: > > From: Mitali Borkar > > > Sent: 12 April 2021 00:09 > > > > > > This patch fixes the warning identified by checkpatch.pl by replacing > > > __attribute__aligned(size) with __aligned(size) > > > > > > Signed-off-by: Mitali Borkar <mitaliborkar810@gmail.com> > > > --- > > > .../staging/media/ipu3/include/intel-ipu3.h | 74 +++++++++---------- > > > 1 file changed, 37 insertions(+), 37 deletions(-) > > > > > > diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h > > > b/drivers/staging/media/ipu3/include/intel-ipu3.h > > > index 589d5ccee3a7..d95ca9ebfafb 100644 > > > --- a/drivers/staging/media/ipu3/include/intel-ipu3.h > > > +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h > > > @@ -84,7 +84,7 @@ struct ipu3_uapi_grid_config { > > > */ > > > struct ipu3_uapi_awb_raw_buffer { > > > __u8 meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] > > > - __attribute__((aligned(32))); > > > + __aligned(32); > > > } __packed; > > > > WTF? > > > > It either has 1-byte alignment because it is just __u8, > > 32-byte because of the aligned(32), > > or 1 byte because of the outer packed. > > > > What alignment does this (and all the other) structures > > actually need? > > 32 as noted above. Here packed makes no difference though. Bollocks - it ought to override the __aligned(32); > Some of these structs are used embedded in other structs or alone. I > haven't checked this one. > > It's also possible to have __packed and __aligned() conflict (in which case > a decent compiler would give you a warning) --- which does not happen > currently AFAIK. At least one compiler is objecting to some similar constructs. > > > > Specifying 'packed' isn't free. > > It may be free if the packed alignment of the fields corresponds to > architecture's packing. Here __aligned() is used to satisfy > hardware alignment requirements and __packed is used to ensure the same > memory layout independently of ABI rules. No that isn't what packed is for. 'packed' also tells the compiler that the structure may 'exist' at an unaligned address. On many architectures this requires the compiler use byte sized access and shifts for all members. If you are worried that the compiler/ABI might have inserted padding then add a compile-time assert on the structure size. But most kernel code assumes that structures where everything is on its natural boundary won't have any padding. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)
diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h b/drivers/staging/media/ipu3/include/intel-ipu3.h index 589d5ccee3a7..d95ca9ebfafb 100644 --- a/drivers/staging/media/ipu3/include/intel-ipu3.h +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h @@ -84,7 +84,7 @@ struct ipu3_uapi_grid_config { */ struct ipu3_uapi_awb_raw_buffer { __u8 meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] - __attribute__((aligned(32))); + __aligned(32); } __packed; /** @@ -105,7 +105,7 @@ struct ipu3_uapi_awb_config_s { __u16 rgbs_thr_gb; __u16 rgbs_thr_b; struct ipu3_uapi_grid_config grid; -} __attribute__((aligned(32))) __packed; +} __aligned(32) __packed; /** * struct ipu3_uapi_awb_config - AWB config wrapper @@ -113,7 +113,7 @@ struct ipu3_uapi_awb_config_s { * @config: config for auto white balance as defined by &ipu3_uapi_awb_config_s */ struct ipu3_uapi_awb_config { - struct ipu3_uapi_awb_config_s config __attribute__((aligned(32))); + struct ipu3_uapi_awb_config_s config __aligned(32); } __packed; #define IPU3_UAPI_AE_COLORS 4 /* R, G, B, Y */ @@ -138,7 +138,7 @@ struct ipu3_uapi_ae_raw_buffer { * @buff: &ipu3_uapi_ae_raw_buffer to hold full frame meta data. */ struct ipu3_uapi_ae_raw_buffer_aligned { - struct ipu3_uapi_ae_raw_buffer buff __attribute__((aligned(32))); + struct ipu3_uapi_ae_raw_buffer buff __aligned(32); } __packed; /** @@ -244,10 +244,10 @@ struct ipu3_uapi_ae_ccm { * Calculate AE grid from image resolution, resample ae weights. */ struct ipu3_uapi_ae_config { - struct ipu3_uapi_ae_grid_config grid_cfg __attribute__((aligned(32))); + struct ipu3_uapi_ae_grid_config grid_cfg __aligned(32); struct ipu3_uapi_ae_weight_elem weights[ - IPU3_UAPI_AE_WEIGHTS] __attribute__((aligned(32))); - struct ipu3_uapi_ae_ccm ae_ccm __attribute__((aligned(32))); + IPU3_UAPI_AE_WEIGHTS] __aligned(32); + struct ipu3_uapi_ae_ccm ae_ccm __aligned(32); } __packed; /** @@ -389,7 +389,7 @@ struct ipu3_uapi_af_filter_config { * each cell. */ struct ipu3_uapi_af_raw_buffer { - __u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] __attribute__((aligned(32))); + __u8 y_table[IPU3_UAPI_AF_Y_TABLE_MAX_SIZE] __aligned(32); } __packed; /** @@ -402,9 +402,9 @@ struct ipu3_uapi_af_raw_buffer { * grid size for large image and vice versa. */ struct ipu3_uapi_af_config_s { - struct ipu3_uapi_af_filter_config filter_config __attribute__((aligned(32))); + struct ipu3_uapi_af_filter_config filter_config __aligned(32); __u8 padding[4]; - struct ipu3_uapi_grid_config grid_cfg __attribute__((aligned(32))); + struct ipu3_uapi_grid_config grid_cfg __aligned(32); } __packed; #define IPU3_UAPI_AWB_FR_MAX_SETS 24 @@ -425,7 +425,7 @@ struct ipu3_uapi_af_config_s { */ struct ipu3_uapi_awb_fr_raw_buffer { __u8 meta_data[IPU3_UAPI_AWB_FR_BAYER_TABLE_MAX_SIZE] - __attribute__((aligned(32))); + __aligned(32); } __packed; /** @@ -463,12 +463,12 @@ struct ipu3_uapi_awb_fr_config_s { * @awb_fr_config: &ipu3_uapi_awb_fr_config_s, default resolution 16x16 */ struct ipu3_uapi_4a_config { - struct ipu3_uapi_awb_config_s awb_config __attribute__((aligned(32))); + struct ipu3_uapi_awb_config_s awb_config __aligned(32); struct ipu3_uapi_ae_grid_config ae_grd_config; __u8 padding[20]; struct ipu3_uapi_af_config_s af_config; struct ipu3_uapi_awb_fr_config_s awb_fr_config - __attribute__((aligned(32))); + __aligned(32); } __packed; /** @@ -487,7 +487,7 @@ struct ipu3_uapi_4a_config { * @padding3: padding bytes. */ struct ipu3_uapi_bubble_info { - __u32 num_of_stripes __attribute__((aligned(32))); + __u32 num_of_stripes __aligned(32); __u8 padding[28]; __u32 num_sets; __u8 padding1[28]; @@ -519,7 +519,7 @@ struct ipu3_uapi_stats_3a_bubble_info_per_stripe { * @padding3: padding config */ struct ipu3_uapi_ff_status { - __u32 awb_en __attribute__((aligned(32))); + __u32 awb_en __aligned(32); __u8 padding[28]; __u32 ae_en; __u8 padding1[28]; @@ -992,8 +992,8 @@ struct ipu3_uapi_gamma_corr_lut { * @gc_lut: lookup table of gamma correction &ipu3_uapi_gamma_corr_lut */ struct ipu3_uapi_gamma_config { - struct ipu3_uapi_gamma_corr_ctrl gc_ctrl __attribute__((aligned(32))); - struct ipu3_uapi_gamma_corr_lut gc_lut __attribute__((aligned(32))); + struct ipu3_uapi_gamma_corr_ctrl gc_ctrl __aligned(32); + struct ipu3_uapi_gamma_corr_lut gc_lut __aligned(32); } __packed; /** @@ -1196,8 +1196,8 @@ struct ipu3_uapi_shd_lut { * @shd_lut: shading lookup table &ipu3_uapi_shd_lut */ struct ipu3_uapi_shd_config { - struct ipu3_uapi_shd_config_static shd __attribute__((aligned(32))); - struct ipu3_uapi_shd_lut shd_lut __attribute__((aligned(32))); + struct ipu3_uapi_shd_config_static shd __aligned(32); + struct ipu3_uapi_shd_lut shd_lut __aligned(32); } __packed; /* Image Enhancement Filter directed */ @@ -2421,8 +2421,8 @@ struct ipu3_uapi_anr_stitch_config { * @stitch: create 4x4 patch from 4 surrounding 8x8 patches. */ struct ipu3_uapi_anr_config { - struct ipu3_uapi_anr_transform_config transform __attribute__((aligned(32))); - struct ipu3_uapi_anr_stitch_config stitch __attribute__((aligned(32))); + struct ipu3_uapi_anr_transform_config transform __aligned(32); + struct ipu3_uapi_anr_stitch_config stitch __aligned(32); } __packed; /** @@ -2463,21 +2463,21 @@ struct ipu3_uapi_anr_config { struct ipu3_uapi_acc_param { struct ipu3_uapi_bnr_static_config bnr; struct ipu3_uapi_bnr_static_config_green_disparity - green_disparity __attribute__((aligned(32))); - struct ipu3_uapi_dm_config dm __attribute__((aligned(32))); - struct ipu3_uapi_ccm_mat_config ccm __attribute__((aligned(32))); - struct ipu3_uapi_gamma_config gamma __attribute__((aligned(32))); - struct ipu3_uapi_csc_mat_config csc __attribute__((aligned(32))); - struct ipu3_uapi_cds_params cds __attribute__((aligned(32))); - struct ipu3_uapi_shd_config shd __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_iefd_config iefd __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_yds_config yds_c0 __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_chnr_config chnr_c0 __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_y_ee_nr_config y_ee_nr __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_yds_config yds __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_chnr_config chnr __attribute__((aligned(32))); - struct ipu3_uapi_yuvp1_yds_config yds2 __attribute__((aligned(32))); - struct ipu3_uapi_yuvp2_tcc_static_config tcc __attribute__((aligned(32))); + green_disparity __aligned(32); + struct ipu3_uapi_dm_config dm __aligned(32); + struct ipu3_uapi_ccm_mat_config ccm __aligned(32); + struct ipu3_uapi_gamma_config gamma __aligned(32); + struct ipu3_uapi_csc_mat_config csc __aligned(32); + struct ipu3_uapi_cds_params cds __aligned(32); + struct ipu3_uapi_shd_config shd __aligned(32); + struct ipu3_uapi_yuvp1_iefd_config iefd __aligned(32); + struct ipu3_uapi_yuvp1_yds_config yds_c0 __aligned(32); + struct ipu3_uapi_yuvp1_chnr_config chnr_c0 __aligned(32); + struct ipu3_uapi_yuvp1_y_ee_nr_config y_ee_nr __aligned(32); + struct ipu3_uapi_yuvp1_yds_config yds __aligned(32); + struct ipu3_uapi_yuvp1_chnr_config chnr __aligned(32); + struct ipu3_uapi_yuvp1_yds_config yds2 __aligned(32); + struct ipu3_uapi_yuvp2_tcc_static_config tcc __aligned(32); struct ipu3_uapi_anr_config anr; struct ipu3_uapi_awb_fr_config_s awb_fr; struct ipu3_uapi_ae_config ae; @@ -2765,7 +2765,7 @@ struct ipu3_uapi_flags { */ struct ipu3_uapi_params { /* Flags which of the settings below are to be applied */ - struct ipu3_uapi_flags use __attribute__((aligned(32))); + struct ipu3_uapi_flags use __aligned(32); /* Accelerator cluster parameters */ struct ipu3_uapi_acc_param acc_param;
This patch fixes the warning identified by checkpatch.pl by replacing __attribute__aligned(size) with __aligned(size) Signed-off-by: Mitali Borkar <mitaliborkar810@gmail.com> --- .../staging/media/ipu3/include/intel-ipu3.h | 74 +++++++++---------- 1 file changed, 37 insertions(+), 37 deletions(-)