Messages in this thread | | | From | "Adam J. Richter" <> | Date | Fri, 23 Mar 2001 01:52:07 -0800 | Subject | Re: 2.4.3-pre6: agpart.o causes arch/i386/mm/ioremap.c hang |
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I wrote:
> Under linux-2.4.3-pre6 compiled for SMP, loading agpgart.o >hangs the system in remap_area_pages (arch/i386/mm/ioremap.c) at >the call to spin_lock(&init_mm.page_table_lock), which is not in 2.4.2. [...] > agp_backend_initialize > agp_generic_create_gatt_table > io_remap_nocache > __ioremap > remap_area_pages [...]
> I'm rebuilding the kernel now with a modified spin_lock() >routine that should tell me who acquired the lock previously [...]
In case anyone is interested, the conflicting lock of init_mm.page_table_lock was acquired in line 1318 of mm/memory.c, in pte_alloc.
One way that this might be happening is that it looks like no page_table_lock is every acquired by vmalloc, which results in the following call graph:
vmalloc __vmalloc vmalloc_area_pages alloc_area_pmd pte_alloc ...which assumes (here incorrectly) that mm->page_table_lock is held, and sometimes releases and reacquires mm->page_table_lock.
I will attempt to analyze this further tomorrow if nobody beats me to it.
Adam J. Richter __ ______________ 4880 Stevens Creek Blvd, Suite 104 adam@yggdrasil.com \ / San Jose, California 95129-1034 +1 408 261-6630 | g g d r a s i l United States of America fax +1 408 261-6631 "Free Software For The Rest Of Us." - 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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