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Date: Thu, 27 Jan 2022 14:47:04 -0800
From: Nick Desaulniers <ndesaulniers@...gle.com>
To: Finn Thain <fthain@...ux-m68k.org>, Miguel Ojeda <ojeda@...nel.org>
Cc: Tom Rix <trix@...hat.com>, kashyap.desai@...adcom.com,
sumit.saxena@...adcom.com, shivasharan.srikanteshwara@...adcom.com,
jejb@...ux.ibm.com, martin.petersen@...cle.com, nathan@...nel.org,
megaraidlinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] scsi: megaraid: cleanup formatting of megaraid
+ Miguel (the clang-format maintainer), Joe (checkpatch maintainer)
These criticisms are worth reviewing.
On Thu, Jan 27, 2022 at 2:38 PM Finn Thain <fthain@...ux-m68k.org> wrote:
>
>
> On Thu, 27 Jan 2022, trix@...hat.com wrote:
>
> > From: Tom Rix <trix@...hat.com>
> >
> > checkpatch reports several hundred formatting errors. Run these files
> > through clang-format and knock off some of them.
> >
>
> That method seems like a good recipe for endless churn unless checkpatch
> and clang-format really agree about these style rules.
>
> Why use checkpatch to assess code style, if we could simply diff the
> existing source with the output from clang-format... but it seems that
> clang-format harms readability, makes indentation errors and uses
> inconsistent style rules. Some examples:
>
> > static unsigned short int max_sectors_per_io = MAX_SECTORS_PER_IO;
> > module_param(max_sectors_per_io, ushort, 0);
> > -MODULE_PARM_DESC(max_sectors_per_io, "Maximum number of sectors per I/O request (default=MAX_SECTORS_PER_IO=128)");
> > -
> > +MODULE_PARM_DESC(
> > + max_sectors_per_io,
> > + "Maximum number of sectors per I/O request (default=MAX_SECTORS_PER_IO=128)");
> >
> > static unsigned short int max_mbox_busy_wait = MBOX_BUSY_WAIT;
> > module_param(max_mbox_busy_wait, ushort, 0);
> > -MODULE_PARM_DESC(max_mbox_busy_wait, "Maximum wait for mailbox in microseconds if busy (default=MBOX_BUSY_WAIT=10)");
> > +MODULE_PARM_DESC(
> > + max_mbox_busy_wait,
> > + "Maximum wait for mailbox in microseconds if busy (default=MBOX_BUSY_WAIT=10)");
> >
>
> This code is longer for no real improvement.
>
> >
> > /*
> > * The File Operations structure for the serial/ioctl interface of the driver
> > */
> > static const struct file_operations megadev_fops = {
> > - .owner = THIS_MODULE,
> > - .unlocked_ioctl = megadev_unlocked_ioctl,
> > - .open = megadev_open,
> > - .llseek = noop_llseek,
> > + .owner = THIS_MODULE,
> > + .unlocked_ioctl = megadev_unlocked_ioctl,
> > + .open = megadev_open,
> > + .llseek = noop_llseek,
> > };
> >
> > /*
>
> Readability loss.
>
> > - prod_info_dma_handle = dma_map_single(&adapter->dev->dev,
> > - (void *)&adapter->product_info,
> > - sizeof(mega_product_info),
> > - DMA_FROM_DEVICE);
> > + prod_info_dma_handle = dma_map_single(
> > + &adapter->dev->dev, (void *)&adapter->product_info,
> > + sizeof(mega_product_info), DMA_FROM_DEVICE);
> >
>
> Note the orphaned first parameter and odd indentation.
>
> >
> > static DEF_SCSI_QCMD(megaraid_queue)
> >
> > -/**
> > + /**
> > * mega_allocate_scb()
> > * @adapter: pointer to our soft state
> > * @cmd: scsi command from the mid-layer
>
> Indentation error.
>
> > @@ -418,15 +409,14 @@ static DEF_SCSI_QCMD(megaraid_queue)
> > * Allocate a SCB structure. This is the central structure for controller
> > * commands.
> > */
> > -static inline scb_t *
> > -mega_allocate_scb(adapter_t *adapter, struct scsi_cmnd *cmd)
> > + static inline scb_t *mega_allocate_scb(adapter_t *adapter,
> > + struct scsi_cmnd *cmd)
> > {
> > struct list_head *head = &adapter->free_list;
>
> Same.
>
> > @@ -586,26 +568,25 @@ mega_build_cmd(adapter_t *adapter, struct scsi_cmnd *cmd, int *busy)
> >
> > ldrv_num = mega_get_ldrv_num(adapter, cmd, channel);
> >
> > -
> > max_ldrv_num = (adapter->flag & BOARD_40LD) ?
> > - MAX_LOGICAL_DRIVES_40LD : MAX_LOGICAL_DRIVES_8LD;
> > + MAX_LOGICAL_DRIVES_40LD :
> > + MAX_LOGICAL_DRIVES_8LD;
> >
>
> Churn, if not readability loss. Note the indentation change here is
> inconsistent with the indentation change noted above.
>
> > * 6-byte READ(0x08) or WRITE(0x0A) cdb
> > */
> > - if( cmd->cmd_len == 6 ) {
> > - mbox->m_out.numsectors = (u32) cmd->cmnd[4];
> > - mbox->m_out.lba =
> > - ((u32)cmd->cmnd[1] << 16) |
> > - ((u32)cmd->cmnd[2] << 8) |
> > - (u32)cmd->cmnd[3];
> > + if (cmd->cmd_len == 6) {
> > + mbox->m_out.numsectors = (u32)cmd->cmnd[4];
> > + mbox->m_out.lba = ((u32)cmd->cmnd[1] << 16) |
> > + ((u32)cmd->cmnd[2] << 8) |
> > + (u32)cmd->cmnd[3];
> >
> > mbox->m_out.lba &= 0x1FFFFF;
> >
>
> Here, the orphaned term is moved up, next to the =. And yet,
>
> >
> > /* Calculate Scatter-Gather info */
> > - mbox->m_out.numsgelements = mega_build_sglist(adapter, scb,
> > - (u32 *)&mbox->m_out.xferaddr, &seg);
> > + mbox->m_out.numsgelements =
> > + mega_build_sglist(adapter, scb,
> > + (u32 *)&mbox->m_out.xferaddr,
> > + &seg);
> >
> > return scb;
> >
>
> ... here the first term is moved down and orphaned, which is another
> inconsistency.
--
Thanks,
~Nick Desaulniers
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