Re: [PATCH 00/17] Add memberof(), split some headers, and slightly simplify code

Jani Nikula
2021-11-19T13:48:25Z

On Fri, 19 Nov 2021, "Alejandro Colomar (man-pages)" <alx.manpages@gmail.com> wrote:
> Hi Jani,
>
> On 11/19/21 13:47, Jani Nikula wrote:
>> On Fri, 19 Nov 2021, Alejandro Colomar <alx.manpages@gmail.com> wrote:
>>> In the first and second commits
>>> I changed a lot of stuff in many parts,
>>> and that's why I CCd so many people (also in this cover letter).
>>> However, to avoid spamming,
>>> and since it would be a nightmare to
>>> find all the relevant people affected in so many different areas,
>>> I only CCd in 01, 02 and in the cover letter.
>>> If anyone is interested in reading the full patch set,
>>> I sent it to the LKML.
>>
>> I think with the patch split you have this would be a nightmare to get
>> merged. Please consider refactoring the headers first, and once those
>> are reviewed and merged, you can proceed with using them elsewhere. For
>> example, we'd want the drm/i915 changes in patches separate from changes
>> to other drivers or the core headers.
>
> So,
> would it be preferable something like this?:
>
> Patch set 1:
> - Add <linux/memberof.h> with memberof()
> - Split offsetof() to <linux/offsetof.h>
> - Split offsetofend() to <linux/offsetofend.h>
> - Split typeof_member() to <linux/typeof_member.h>
> - Split sizeof_field() to <linux/sizeof_field.h>
> - Split NULL to <linux/NULL.h>
> - Split ARRAY_SIZE() to <linux/array_size.h>
> - Implement offsetof() in terms of memberof()
> - Implement typeof_member() in terms of memberof()
> - Implement sizeof_field() in terms of memberof()
> - Implement container_of_safe() in terms of container_of()
> - Remove unnecessary cast from container_of[_safe]()
> - Cosmetic changes
>
> Patch set 2:
> - And in a different patch set, fix all other files
> that make use of these macros.
>
>
> Patch 1 without editing any other files except for the basic ones,
> and adding includes where the definition had been previously,
> to not break stuff.
>
> And then,
> start patching individual subsystems and
> send tiny patch sets to each of them?
>
>
> For the first part,
> I agree it is better.
> I'll change it to do that.
> I'll send an v2 with less changes and more organized.
>
>
> For the second part,
> I'll see what I can do after the first one has been reviewed.
> I'll do tiny patches with a few changes to one or few files,
> so that I can reorganize them easily with a rebase -i afterwards,
> and then decide.

Sounds about right. I presume just the first series is going to generate
quite a bit of discussion, in particular <linux/NULL.h> looks like
everyone's going to have an opinion. And for that, you really don't need
or want all the users (patch series 2) Cc'd.

BR,
Jani.

>
>
> Thanks,
> Alex
>
>>
>>>
>>>
>>> Alejandro Colomar (17):
>>> linux/container_of.h: Add memberof(T, m)
>>> Use memberof(T, m) instead of explicit NULL dereference
>>> Replace some uses of memberof() by its wrappers
>>> linux/memberof.h: Move memberof() to separate header
>>> linux/typeof_member.h: Move typeof_member() to a separate header
>>> Simplify sizeof(typeof_member()) to sizeof_field()
>>> linux/NULL.h: Move NULL to a separate header
>>> linux/offsetof.h: Move offsetof(T, m) to a separate header
>>> linux/offsetof.h: Implement offsetof() in terms of memberof()
>>> linux/container_of.h: Implement container_of_safe() in terms of
>>> container_of()
>>> linux/container_of.h: Cosmetic
>>> linux/container_of.h: Remove unnecessary cast to (void *)
>>> linux/sizeof_field.h: Move sizeof_field(T, m) to a separate header
>>> include/linux/: Include a smaller header if just for NULL
>>> linux/offsetofend.h: Move offsetofend(T, m) to a separate header
>>> linux/array_size.h: Move ARRAY_SIZE(arr) to a separate header
>>> include/: Include <linux/array_size.h> for ARRAY_SIZE()
>>>
>>> arch/x86/include/asm/bootparam_utils.h | 3 +-
>>> arch/x86/kernel/signal_compat.c | 5 ++--
>>> drivers/gpu/drm/i915/i915_sw_fence.c | 1 +
>>> drivers/gpu/drm/i915/i915_utils.h | 5 ++--
>>> drivers/gpu/drm/i915/intel_runtime_pm.h | 3 +-
>>> drivers/net/ethernet/emulex/benet/be.h | 10 +++----
>>> drivers/net/ethernet/i825xx/ether1.c | 7 +++--
>>> drivers/platform/x86/wmi.c | 3 +-
>>> drivers/scsi/be2iscsi/be.h | 12 ++++----
>>> drivers/scsi/be2iscsi/be_cmds.h | 5 +++-
>>> fs/btrfs/ctree.h | 5 ++--
>>> fs/proc/inode.c | 1 +
>>> include/acpi/actypes.h | 4 ++-
>>> include/crypto/internal/blake2b.h | 1 +
>>> include/crypto/internal/blake2s.h | 1 +
>>> include/crypto/internal/chacha.h | 1 +
>>> include/drm/drm_mipi_dbi.h | 1 +
>>> include/drm/drm_mode_object.h | 1 +
>>> include/kunit/test.h | 1 +
>>> include/linux/NULL.h | 10 +++++++
>>> include/linux/arm_ffa.h | 1 +
>>> include/linux/array_size.h | 15 ++++++++++
>>> include/linux/blk_types.h | 1 +
>>> include/linux/can/core.h | 1 +
>>> include/linux/clk-provider.h | 1 +
>>> include/linux/container_of.h | 28 ++++++++++-------
>>> include/linux/counter.h | 1 +
>>> include/linux/crash_core.h | 1 +
>>> include/linux/efi.h | 1 +
>>> include/linux/extable.h | 2 +-
>>> include/linux/f2fs_fs.h | 1 +
>>> include/linux/filter.h | 3 ++
>>> include/linux/fs.h | 1 +
>>> include/linux/genl_magic_func.h | 1 +
>>> include/linux/hashtable.h | 1 +
>>> include/linux/ieee80211.h | 1 +
>>> include/linux/kbuild.h | 3 ++
>>> include/linux/kernel.h | 7 +----
>>> include/linux/kfifo.h | 1 +
>>> include/linux/kvm_host.h | 3 ++
>>> include/linux/libata.h | 1 +
>>> include/linux/llist.h | 1 +
>>> include/linux/memberof.h | 11 +++++++
>>> include/linux/mlx5/device.h | 1 +
>>> include/linux/mlx5/driver.h | 1 +
>>> include/linux/mm_types.h | 1 +
>>> include/linux/moduleparam.h | 3 ++
>>> include/linux/mtd/rawnand.h | 1 +
>>> include/linux/netdevice.h | 1 +
>>> include/linux/netfilter.h | 1 +
>>> include/linux/nvme-fc.h | 2 ++
>>> include/linux/offsetof.h | 17 +++++++++++
>>> include/linux/offsetofend.h | 19 ++++++++++++
>>> include/linux/pagemap.h | 1 +
>>> include/linux/phy.h | 1 +
>>> include/linux/phy_led_triggers.h | 1 +
>>> include/linux/pinctrl/machine.h | 1 +
>>> include/linux/property.h | 1 +
>>> include/linux/rcupdate.h | 1 +
>>> include/linux/rcupdate_wait.h | 1 +
>>> include/linux/regmap.h | 1 +
>>> include/linux/sched/task.h | 1 +
>>> include/linux/sizeof_field.h | 14 +++++++++
>>> include/linux/skb_array.h | 1 +
>>> include/linux/skbuff.h | 1 +
>>> include/linux/skmsg.h | 3 ++
>>> include/linux/slab.h | 2 ++
>>> include/linux/spinlock_types.h | 1 +
>>> include/linux/stddef.h | 30 +++----------------
>>> include/linux/string.h | 5 +++-
>>> include/linux/surface_aggregator/controller.h | 1 +
>>> include/linux/surface_aggregator/serial_hub.h | 1 +
>>> include/linux/swap.h | 1 +
>>> include/linux/ti-emif-sram.h | 1 +
>>> include/linux/typeof_member.h | 11 +++++++
>>> include/linux/ucs2_string.h | 2 +-
>>> include/linux/vdpa.h | 1 +
>>> include/linux/virtio_config.h | 17 ++++++-----
>>> include/linux/wireless.h | 2 ++
>>> include/net/bond_3ad.h | 1 +
>>> include/net/dsa.h | 1 +
>>> include/net/ip_vs.h | 1 +
>>> include/net/netfilter/nf_conntrack_tuple.h | 1 +
>>> include/net/netfilter/nf_tables.h | 1 +
>>> include/net/netlink.h | 1 +
>>> include/rdma/uverbs_ioctl.h | 1 +
>>> include/rdma/uverbs_named_ioctl.h | 1 +
>>> include/scsi/scsi_host.h | 1 +
>>> include/sound/soc-dapm.h | 1 +
>>> include/sound/soc.h | 1 +
>>> include/trace/events/wbt.h | 1 +
>>> include/uapi/linux/netfilter/xt_sctp.h | 1 +
>>> include/xen/hvm.h | 1 +
>>> kernel/kallsyms.c | 3 +-
>>> 94 files changed, 255 insertions(+), 79 deletions(-)
>>> create mode 100644 include/linux/NULL.h
>>> create mode 100644 include/linux/array_size.h
>>> create mode 100644 include/linux/memberof.h
>>> create mode 100644 include/linux/offsetof.h
>>> create mode 100644 include/linux/offsetofend.h
>>> create mode 100644 include/linux/sizeof_field.h
>>> create mode 100644 include/linux/typeof_member.h
>>

--
Jani Nikula, Intel Open Source Graphics Center