kernel.git/arch/mips/kernel, branch linux-2.6.21.y

[MIPS] Fix BUG(), BUG_ON() handling

2007-04-20T13:58:37Z

With commit 63dc68a8cf60cb110b147dab1704d990808b39e2, kernel can not handle BUG() and BUG_ON() properly since get_user() returns false for kernel code. Use __get_user() to skip unnecessary access_ok(). This patch also make BRK_BUG code encoded in the TNE instruction. Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

[MIPS] Retry {save,restore}_fp_context if failed in atomic context.

2007-04-20T13:58:37Z

The save_fp_context()/restore_fp_context() might sleep on accessing user stack and therefore might lose FPU ownership in middle of them. If these function failed due to "in_atomic" test in do_page_fault, touch the sigcontext area in non-atomic context and retry these save/restore operation. This is a replacement of a (broken) fix which was titled "Allow CpU exception in kernel partially". Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

[MIPS] Disallow CpU exception in kernel again.

2007-04-20T13:58:37Z

The commit 4d40bff7110e9e1a97ff8c01bdd6350e9867cc10 ("Allow CpU exception in kernel partially") was broken. The commit was to fix theoretical problem but broke usual case. Revert it for now. Signed-off-by: Atsushi Nemoto Signed-off-by: Ralf Baechle

[MIPS] SMTC: Fix recursion in instant IPI replay code.

2007-03-29T22:46:36Z

local_irq_restore -> raw_local_irq_restore -> irq_restore_epilog -> smtc_ipi_replay -> smtc_ipi_dq -> spin_unlock_irqrestore -> _spin_unlock_irqrestore -> local_irq_restore The recursion does abort when there is no more IPI queued for a CPU, so this isn't usually fatal which is why we got away with this for so long until this was discovered by code inspection. Signed-off-by: Ralf Baechle

[MIPS] SMTC: Fix false trigger of debug code on single VPE.

2007-03-29T22:46:36Z

Make smtc_setup_irq() update the list of interrupts which need to be watched by the debug code itself. Also there is no need to initialize the IPI swint when running with a single VPE, so don't initialize it. Signed-off-by: Ralf Baechle

[MIPS] SMTC: irq_{enter,leave} and kstats keeping for relayed timer ints.

2007-03-29T22:46:35Z

Signed-off-by: Ralf Baechle

[MIPS] lockdep: Deal with interrupt disable hazard in TRACE_IRQFLAGS

2007-03-29T22:46:35Z

Between the mtc0 or di instruction that disables interrupts and the following hazard barrier a processor may still take interrupts. If an interrupt is taken after interrupts are disabled but before the state is updated it will appear to restore_all that it is incorrectly returning with interrupts disabled. Signed-off-by: Chris Dearman Signed-off-by: Ralf Baechle

[MIPS] lockdep: Handle interrupts in R3000 style c0_status register.

2007-03-29T22:46:35Z

Check the IEP bit for R3000 style processors when checking to see if interrupts will be reenabled in restore_all. Signed-off-by: Chris Dearman Signed-off-by: Ralf Baechle

[MIPS] Export except_vec_vi_{mori,lui,ori} as text symbols.

2007-03-19T20:22:44Z

Otherwise objdump will screw up disassembly. Signed-off-by: Ralf Baechle

[MIPS] VI: TRACE_IRQS_OFF clobbers $v0, so save & restore around call.

2007-03-19T20:22:43Z

Signed-off-by: Ralf Baechle