| Commit message (Collapse) | Author | Age | Files | Lines | |
|---|---|---|---|---|---|
| * | metag: kick: add missing irq_enter/exit to kick_handler() | James Hogan | 2013-07-02 | 1 | -0/+9 |
| | | | | | | | | | | | | | | | | | | | | | | | kick_handler() doesn't have an irq_enter/exit pair, but it's used for handling SMP IPIs which require work to be done in softirqs, which are invoked from irq_exit() when the hard irq nest count reaches 0. The scheduler_ipi() callback in the IPI handler calls irq_enter/exit itself, but this is inside kick_handler()'s spin lock critical section, so if an invoked softirq issues an IPI the kick_handler() will be re-entered on the same CPU and will deadlock. This is easily fixed by adding the missing irq_enter/exit to kick_handler() so that the hard irq nest count doesn't reach 0 until after the spin lock has been released. Ideally the spin lock protected handler list will also be replaced by a lockless RCU protected list since it is certainly mostly read. That can be done in a later change though. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> | ||||
| * | metag: move kick.c exports out of metag_ksyms.c | James Hogan | 2013-03-02 | 1 | -0/+3 |
| | | | | | | | | | It's less error prone to have function symbols exported immediately after the function rather than in metag_ksyms.c. Move each EXPORT_SYMBOL in metag_ksyms.c for symbols defined in kick.c into kick.c Signed-off-by: James Hogan <james.hogan@imgtec.com> | ||||
| * | metag: Traps | James Hogan | 2013-03-02 | 1 | -0/+98 |
| Add trap code for metag. At the lowest level Meta traps (and return from interrupt instruction - RTI) simply swap the PC and PCX registers and optionally toggle the interrupt status bit (ISTAT). Low level TBX code in tbipcx.S handles the core context save, determine the TBX signal number based on the core trigger that fired (using the TXSTATI status register), and call TBX signal handlers (mostly in traps.c) via a vector table. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Al Viro <viro@zeniv.linux.org.uk> | |||||
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index : op-kernel-dev | |
| Development kernel branch for OpenPOWER systems | Raptor Engineering, LLC |
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