Commit d6b9acc0 authored by Paul Jackson's avatar Paul Jackson Committed by Linus Torvalds
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[PATCH] Document patch subject line better

Improve explanation of the Subject line fields in
Documentation/SubmittingPatches Canonical Patch Format.

Signed-off-by: default avatarPaul Jackson <>
Signed-off-by: default avatarLinus Torvalds <>
parent c77054e5
......@@ -305,7 +305,7 @@ point out some special detail about the sign-off.
The canonical patch subject line is:
Subject: [PATCH 001/123] [<area>:] <explanation>
Subject: [PATCH 001/123] subsystem: summary phrase
The canonical patch message body contains the following:
......@@ -330,9 +330,25 @@ alphabetically by subject line - pretty much any email reader will
support that - since because the sequence number is zero-padded,
the numerical and alphabetic sort is the same.
See further details on how to phrase the "<explanation>" in the
"Subject:" line in Andrew Morton's "The perfect patch", referenced
The "subsystem" in the email's Subject should identify which
area or subsystem of the kernel is being patched.
The "summary phrase" in the email's Subject should concisely
describe the patch which that email contains. The "summary
phrase" should not be a filename. Do not use the same "summary
phrase" for every patch in a whole patch series.
Bear in mind that the "summary phrase" of your email becomes
a globally-unique identifier for that patch. It propagates
all the way into the git changelog. The "summary phrase" may
later be used in developer discussions which refer to the patch.
People will want to google for the "summary phrase" to read
discussion regarding that patch.
A couple of example Subjects:
Subject: [patch 2/5] ext2: improve scalability of bitmap searching
Subject: [PATCHv2 001/207] x86: fix eflags tracking
The "from" line must be the very first line in the message body,
and has the form:
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