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With a realtime kernel with full preemption (CONFIG_PREEMPT_RT_FULL), spinlocks can sleep, interrupt handlers run in thread context, and the standard local_irq functions manipulate preemptibility, not HW interruptibility. Under these conditions, most calls to local_irq functions should be replaced by no-ops. The CONFIG_PREEMPT_RT patch defines _nort versions of local_irq functions that compile away under CONFIG_PREEMPT_RT_FULL and compile to their "normal" equivalents otherwise. Define _nort equivalents to support compilation against both "normal" and RT-patched kernels, and use the _nort local_irq functons in cases where spinlocks are taken within a local_irq_save() or local_irq_disable() block. Without these changes, runtime warnings about "sleeping function called from invalid context" occur. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> [bvanassche: Edited patch description and comment in scst_priv.h] git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5288 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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. Vladislav Bolkhovitin <vst@vlnb.net>, http://scst.sourceforge.net