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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Larry Chen <lchen@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Mark Fasheh <mark@fasheh.com>,
        Joel Becker <jlbec@evilplan.org>,
        Junxiao Bi <junxiao.bi@oracle.com>,
        Joseph Qi <jiangqi903@gmail.com>,
        Changwei Ge <ge.changwei@h3c.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.20 267/352] ocfs2: improve ocfs2 Makefile
Date:   Mon, 11 Feb 2019 15:18:14 +0100
Message-Id: <20190211141904.015468198@linuxfoundation.org>
In-Reply-To: <20190211141846.543045703@linuxfoundation.org>
References: <20190211141846.543045703@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 9e6aea22802b5684c7e1d69822aeb0844dd01953 ]

Included file path was hard-wired in the ocfs2 makefile, which might
causes some confusion when compiling ocfs2 as an external module.

Say if we compile ocfs2 module as following.
cp -r /kernel/tree/fs/ocfs2 /other/dir/ocfs2
cd /other/dir/ocfs2
make -C /path/to/kernel_source M=`pwd` modules

Acutally, the compiler wil try to find included file in
/kernel/tree/fs/ocfs2, rather than the directory /other/dir/ocfs2.

To fix this little bug, we introduce the var $(src) provided by kbuild.
$(src) means the absolute path of the running kbuild file.

Link: http://lkml.kernel.org/r/20181108085546.15149-1-lchen@suse.com
Signed-off-by: Larry Chen <lchen@suse.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Changwei Ge <ge.changwei@h3c.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/ocfs2/Makefile       | 2 +-
 fs/ocfs2/dlm/Makefile   | 2 +-
 fs/ocfs2/dlmfs/Makefile | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
index 99ee093182cb..cc9b32b9db7c 100644
--- a/fs/ocfs2/Makefile
+++ b/fs/ocfs2/Makefile
@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
-ccflags-y := -Ifs/ocfs2
+ccflags-y := -I$(src)
 
 obj-$(CONFIG_OCFS2_FS) += 	\
 	ocfs2.o			\
diff --git a/fs/ocfs2/dlm/Makefile b/fs/ocfs2/dlm/Makefile
index bd1aab1f49a4..ef2854422a6e 100644
--- a/fs/ocfs2/dlm/Makefile
+++ b/fs/ocfs2/dlm/Makefile
@@ -1,4 +1,4 @@
-ccflags-y := -Ifs/ocfs2
+ccflags-y := -I$(src)/..
 
 obj-$(CONFIG_OCFS2_FS_O2CB) += ocfs2_dlm.o
 
diff --git a/fs/ocfs2/dlmfs/Makefile b/fs/ocfs2/dlmfs/Makefile
index eed3db8c5b49..33431a0296a3 100644
--- a/fs/ocfs2/dlmfs/Makefile
+++ b/fs/ocfs2/dlmfs/Makefile
@@ -1,4 +1,4 @@
-ccflags-y := -Ifs/ocfs2
+ccflags-y := -I$(src)/..
 
 obj-$(CONFIG_OCFS2_FS) += ocfs2_dlmfs.o
 
-- 
2.19.1