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This patch avoids that the following warning is reported when building against kernel v4.21: ================= WARNING ================ 'SUBDIRS' will be removed after Linux 5.3 Please use 'M=' or 'KBUILD_EXTMOD' instead ========================================== A quote from an upstream kernel patch: commit 07e5823127155b3a29003aca926f87c9843f6810 Author: Andrew Morton <akpm@osdl.org> Date: Mon Apr 12 01:05:40 2004 -0700 [PATCH] kbuild: external module support From: Sam Ravnborg <sam@ravnborg.org> Based on initial patch from Andreas Gruenbacher there is now better support for building external modules with kbuild. The preferred syntax is now: make -C $KERNELSRC M=$PWD but the old syntax: make -C $KERNELSRC SUBDIRS=$PWD modules will remain supported. git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7851 d57e44dd-8a1f-0410-8b47-8ef2f437770f
Overview ======== This is the SCST development repository. It contains not a single project SCST as one can think, but a number of them, which are divided as the following: 1. SCST core in scst/ subdirectory 2. Administration utility for SCST core scstadmin in scstadmin/ 3. Target drivers in own subdirectories qla2x00t/, iscsi-scst/, etc. 4. User space programs in usr/ subdirectory, like fileio_tgt. 5. Some various docs in doc/ subdirectory. Those subprojects are in most cases independent from each other, although some of them depend from the SCST core. They put in the single repository only to simplify their development, they are released independently. Thus, use "make all" only if you really need to build everything. Otherwise build only what you need, like for iSCSI-SCST: make scst scst_install iscsi iscsi_install For more information about each subproject see their README files. QLogic target driver ==================== QLogic target driver qla2x00t is the old driver, forked from qla2xxx several years ago. It is very stable, well tested and actively used in many production setups. There is also new driver, maintained by QLogic, which, among other, supports 32G FC, see http://scst.sourceforge.net/target_qla2x00t.html. You can find the latest version of it in git://git.qlogic.com/scst-qla2xxx.git. To integrate it into the SCST build tree you need to clone the QLogic git tree in a subdirectory of this directory (SCST root tree) with name qla2x00t_git (or create a symlink with this name pointing to any other location in your system). Now common and QLA specific root Makefile targets "magically" start working with the new driver. Then follow instructions in the git's README. In presence of qla2x00t_git subdirectory you can still build the qla2x00t using qla_old* root Makefile targets. Vladislav Bolkhovitin <vst@vlnb.net>, http://scst.sourceforge.net