Re: [PATCH v6] checkpatch: add support to check 'Fixes:' tag format

[Joe Perches <joe@perches.com>]

On Mon, 2020-05-04 at 16:20 +0800, Wang YanQing wrote:
> According to submitting-patches.rst, 'Fixes:' tag has a little
> stricter condition about the one line summary than normal git
> commit description:
> “...
> Do not split the tag across multiple lines, tags are exempt from
> the "wrap at 75 columns" rule in order to simplify parsing scripts
> ...”
> 
> And there is no sanity check for 'Fixes:' tag format in checkpatch
> the same as GIT_COMMIT_ID for git commit description, so let's expand
> the GIT_COMMIT_ID to add 'Fixes:' tag format check support.
> 
> The check supports below formats:
> Fixes: 54a4f0239f2e ("KVM: MMU: make kvm_mmu_zap_page() return the number of pages it actually freed")
> Fixes: 85f7cd3a2aad ("Revert "media: Kconfig: better support hybrid TV devices"")
> Fixes: 878520ac45f9 ("ext4: save the error code which triggered...")
> Fixes: 878520ac45f9 ("ext4: save the error code which triggered")
> Fixes: 277f27e2f277 ("SUNRPC/cache: Allow garbage collection ... ")
> 
> The check doesn't support below formats and it will emit diagnostics info for them:
> Fixes: f2c2e717642c ("usb: gadget: add raw-gadget interface"
> Fixes: 6c73698904aa pinctrl: qcom: Introduce readl/writel accessors
> Fixes: 3fd6e7d9a146 (ASoC: tas571x: New driver for TI TAS571x power amplifiers)
> Fixes: 55697cbb44e4 ("arm64: dts: renesas: r8a779{65,80,90}: Add IPMMU devices nodes)
> Fixes: ba35f8588f47 (“ipvlan: Defer multicast / broadcast processing to a work-queue”)
> Fixes: cd758a9b57ee "KVM: PPC: Book3S HV: Use __gfn_to_pfn_memslot in HPT page fault handler"
> Fixes:      9b1640686470 ("scsi: lpfc: Fix use-after-free mailbox cmd completion")
> Fixes: 03f6fc6de919 ('ASoC: rt5682: Add the soundwire support')
> Fixes: 03404e8ae652("IB/mlx5: Add support to dropless RQ")
> 
> Because after GIT_COMMIT_ID supports 'Fixes:' tag format check, it could do
> the same check as the UNKNOWN_COMMIT_ID, so we don't need UNKNOWN_COMMIT_ID
> anymore and I decide to delete it.
> 
> Note: this patch also fixes double quotation mark issue for normal git
>       commit description, and now it supports double quotation mark in
>       title line, for example:
>       Commit e33e2241e272 ("Revert "cfg80211: Use 5MHz bandwidth by default
>       when checking usable channels"")
> 
> Note: this patch also adds diagnostics info support for normal git commit
>       description format check.

Thanks YanQing.

All of this seems fine, but perhaps checkpatch's output message content
could be a bit shorter.  I'll give it a think for a while.