Messages in this thread Patch in this message | | | Date | Wed, 13 Apr 2005 17:20:39 -0700 | From | Andrew Morton <> | Subject | Re: 2.6.12-rc2-mm3 |
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Ed Tomlinson <tomlins@cam.org> wrote: > > > Don't think so - it works OK here. Checked the .config? Does the serial > > port work if you do `echo foo > /dev/ttyS0'? ACPI? > > Turned out it was some old ups software that got reactivated on the box displaying the > console - was a pain to disable it....
OK.
> In any case, when the box reboots there are not any messages. Any ideas on what debug > options to enable or suggestions on how we can figure out the cause of the reboots.
There were a few problems in the task switching area - maybe that.
From: Ingo Molnar <mingo@elte.hu>
delay the reloading of segment registers into switch_mm(), so that if the LDT size changes we dont get a (silent) fault and a zeroed selector register upon reloading.
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> ---
25-akpm/arch/i386/kernel/process.c | 10 +++++----- 25-akpm/include/asm-i386/mmu_context.h | 7 +++++++ 2 files changed, 12 insertions(+), 5 deletions(-)
diff -puN arch/i386/kernel/process.c~sched-unlocked-context-switches-fix arch/i386/kernel/process.c --- 25/arch/i386/kernel/process.c~sched-unlocked-context-switches-fix 2005-04-12 03:43:07.254363568 -0700 +++ 25-akpm/arch/i386/kernel/process.c 2005-04-12 03:43:07.259362808 -0700 @@ -653,12 +653,12 @@ struct task_struct fastcall * __switch_t asm volatile("mov %%gs,%0":"=m" (prev->gs)); /* - * Restore %fs and %gs if needed. + * Clear selectors if needed: */ - if (unlikely(prev->fs | prev->gs | next->fs | next->gs)) { - loadsegment(fs, next->fs); - loadsegment(gs, next->gs); - } + if (unlikely((prev->fs | prev->gs) && !(next->fs | next->gs))) { + loadsegment(fs, next->fs); + loadsegment(gs, next->gs); + } /* * Now maybe reload the debug registers diff -puN include/asm-i386/mmu_context.h~sched-unlocked-context-switches-fix include/asm-i386/mmu_context.h --- 25/include/asm-i386/mmu_context.h~sched-unlocked-context-switches-fix 2005-04-12 03:43:07.256363264 -0700 +++ 25-akpm/include/asm-i386/mmu_context.h 2005-04-12 03:43:07.260362656 -0700 @@ -61,6 +61,13 @@ static inline void switch_mm(struct mm_s } } #endif + /* + * Now that we've switched the LDT, load segments: + */ + if (unlikely(current->thread.fs | current->thread.gs)) { + loadsegment(fs, current->thread.fs); + loadsegment(gs, current->thread.gs); + } } #define deactivate_mm(tsk, mm) \ _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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