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Date:   Wed, 27 Sep 2023 09:15:32 -0700
From:   Kees Cook <keescook@chromium.org>
To:     Justin Stitt <justinstitt@google.com>
Cc:     Joe Perches <joe@perches.com>, linux-kernel@vger.kernel.org,
        Nick Desaulniers <ndesaulniers@google.com>,
        Nathan Chancellor <nathan@kernel.org>,
        Jakub Kicinski <kuba@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        geert@linux-m68k.org, gregkh@linuxfoundation.org,
        workflows@vger.kernel.org, mario.limonciello@amd.com
Subject: Re: [PATCH 3/3] get_maintainer: add patch-only pattern matching type
Message-ID: <202309270913.911E51C@keescook>
References: <20230927-get_maintainer_add_d-v1-0-28c207229e72@google.com>
 <20230927-get_maintainer_add_d-v1-3-28c207229e72@google.com>
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On Wed, Sep 27, 2023 at 03:19:16AM +0000, Justin Stitt wrote:
> Add the "D:" type which behaves the same as "K:" but will only match
> content present in a patch file.
> 
> To illustrate:
> 
> Imagine this entry in MAINTAINERS:
> 
> NEW REPUBLIC
> M: Han Solo <hansolo@rebelalliance.co>
> W: https://www.jointheresistance.org
> D: \bstrncpy\b
> 
> Our maintainer, Han, will only be added to the recipients if a patch
> file is passed to get_maintainer (like what b4 does):
> $ ./scripts/get_maintainer.pl 0004-some-change.patch
> 
> If the above patch has a `strncpy` present in the subject, commit log or
> diff then Han will be to/cc'd.
> 
> However, in the event of a file from the tree given like:
> $ ./scripts/get_maintainer.pl ./lib/string.c
> 
> Han will not be noisily to/cc'd (like a K: type would in this
> circumstance)
> 
> Note that folks really shouldn't be using get_maintainer on tree files
> anyways [1].
> 
> [1]: https://lore.kernel.org/all/20230726151515.1650519-1-kuba@kernel.org/

As Greg suggested, please drop the above paragraph and link. Then this
looks good to me.

I would immediately want to send this patch too, so please feel free to
add this to your series (and I bet many other hints on "git grep 'K:.\\b'"
would want to switch from K: to D: too):

diff --git a/MAINTAINERS b/MAINTAINERS
index 5f18c6ba3c3c..830e10866acf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5057,7 +5057,7 @@ F:	Documentation/kbuild/llvm.rst
 F:	include/linux/compiler-clang.h
 F:	scripts/Makefile.clang
 F:	scripts/clang-tools/
-K:	\b(?i:clang|llvm)\b
+D:	\b(?i:clang|llvm)\b
 
 CLK API
 M:	Russell King <linux@armlinux.org.uk>
@@ -8199,7 +8199,7 @@ F:	lib/strcat_kunit.c
 F:	lib/strscpy_kunit.c
 F:	lib/test_fortify/*
 F:	scripts/test_fortify.sh
-K:	\b__NO_FORTIFY\b
+D:	\b__NO_FORTIFY\b
 
 FPGA DFL DRIVERS
 M:	Wu Hao <hao.wu@intel.com>
@@ -11457,9 +11457,9 @@ F:	include/linux/overflow.h
 F:	include/linux/randomize_kstack.h
 F:	kernel/configs/hardening.config
 F:	mm/usercopy.c
-K:	\b(add|choose)_random_kstack_offset\b
-K:	\b__check_(object_size|heap_object)\b
-K:	\b__counted_by\b
+D:	\b(add|choose)_random_kstack_offset\b
+D:	\b__check_(object_size|heap_object)\b
+D:	\b__counted_by\b
 
 KERNEL JANITORS
 L:	kernel-janitors@vger.kernel.org
@@ -17354,7 +17354,7 @@ F:	drivers/acpi/apei/erst.c
 F:	drivers/firmware/efi/efi-pstore.c
 F:	fs/pstore/
 F:	include/linux/pstore*
-K:	\b(pstore|ramoops)
+D:	\b(pstore|ramoops)
 
 PTP HARDWARE CLOCK SUPPORT
 M:	Richard Cochran <richardcochran@gmail.com>
@@ -19302,8 +19302,8 @@ F:	include/uapi/linux/seccomp.h
 F:	kernel/seccomp.c
 F:	tools/testing/selftests/kselftest_harness.h
 F:	tools/testing/selftests/seccomp/*
-K:	\bsecure_computing
-K:	\bTIF_SECCOMP\b
+D:	\bsecure_computing
+D:	\bTIF_SECCOMP\b
 
 SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) Broadcom BRCMSTB DRIVER
 M:	Kamal Dasu <kamal.dasu@broadcom.com>

-- 
Kees Cook