Hi Thomas,
This patch solved my problem.
Thanks!
-Steve
Thomas Gleixner wrote:
> does the patch below help ?
>
> Thanks,
>
> tglx
> ---
> Subject: powerpc-fixup-pagefault-disable-changes.patch
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Date: Mon, 06 Jul 2009 17:36:01 +0200
>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
> arch/powerpc/include/asm/highmem.h | 3 +++
> 1 file changed, 3 insertions(+)
>
> Index: linux-2.6-tip/arch/powerpc/include/asm/highmem.h
> ===================================================================
> --- linux-2.6-tip.orig/arch/powerpc/include/asm/highmem.h
> +++ linux-2.6-tip/arch/powerpc/include/asm/highmem.h
> @@ -90,6 +90,7 @@ static inline void *kmap_atomic_prot(str
> unsigned long vaddr;
>
> /* even !CONFIG_PREEMPT needs this, for in_atomic in
> do_page_fault */
> + preempt_disable();
> pagefault_disable();
> if (!PageHighMem(page))
> return page_address(page);
> @@ -118,6 +119,7 @@ static inline void kunmap_atomic(void *k
>
> if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
> pagefault_enable();
> + preempt_enable();
> return;
> }
>
> @@ -131,6 +133,7 @@ static inline void kunmap_atomic(void *k
> local_flush_tlb_page(NULL, vaddr);
> #endif
> pagefault_enable();
> + preempt_enable();
> }
>
> static inline struct page *kmap_atomic_to_page(void *ptr)
--
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