Re: Feedback on preemptible kernel patch

[Robert Love <rml@tech9.net>]

Arjan,

the following patch was written by Manfred Spraul to fix your highmem
bug.  I haven't had a chance to go over it, but I would like it if you
could test it.  It can't hurt.  Patch it on top of the preempt patch and
enable CONFIG_PREEMPT, CONFIG_HIGHMEM, and CONFIG_HIGHMEM_DEBUG.

let me know what happens...any relevant messages, etc. please pass
along. if it does work, id be curious if they are any slowdowns


--- highmem.h.prev      Sun Sep  9 08:59:04 2001
+++ highmem.h   Sun Sep  9 09:00:07 2001
@@ -88,6 +88,7 @@
        if (page < highmem_start_page)
                return page_address(page);

+       ctx_sw_off();
        idx = type + KM_TYPE_NR*smp_processor_id();
        vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#if HIGHMEM_DEBUG
@@ -119,6 +120,7 @@
        pte_clear(kmap_pte-idx);
        __flush_tlb_one(vaddr);
#endif
+       ctx_sw_on();
}

#endif /* __KERNEL__ */



-- 
Robert M. Love
rml at ufl.edu
rml at tech9.net
-- 
Robert M. Love
rml at ufl.edu
rml at tech9.net