linux-kernel - [PATCH] scripts: Fix incremental build header re-generation

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Date:   Mon,  1 Mar 2021 06:22:20 -0800
From:   Jeevan Shriram <jshriram@...eaurora.org>
To:     linux-kbuild@...r.kernel.org
Cc:     Jeevan Shriram <jshriram@...eaurora.org>,
        linux-kernel@...r.kernel.org, tsoni@...eaurora.org
Subject: [PATCH] scripts: Fix incremental build header re-generation

compile.h and autoconf.h are ignored when checking headers sha as they
are always re-generated for every kernel compilation. However,
these two headers are packaged into kheaders tar. During incremental
compilation of kernel, kheaders tar file is always generated and re-packaged
irrespective of the changes in headers.

Change-Id: I7a64faebb81df44c32230b0fea1d6df09d7ce66f
Signed-off-by: Jeevan Shriram <jshriram@...eaurora.org>
---
 kernel/gen_kheaders.sh | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/gen_kheaders.sh b/kernel/gen_kheaders.sh
index c1510f0..5499f72 100755
--- a/kernel/gen_kheaders.sh
+++ b/kernel/gen_kheaders.sh
@@ -51,8 +51,7 @@ this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
 if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
 if [ -f kernel/kheaders.md5 ] &&
 	[ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&
-	[ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
-	[ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
+	[ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ]; then
 		exit
 fi
 
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