Steve,
On Thu, 2 Jul 2009, Steve Rottinger wrote:
> I'm using 2.6.29.5-rt22 on a custom ppc32 (8641D) board. About half the
> time, the board will boot up correctly. The other half of the time, I'll
> get segfaults in various parts of the init process. I've also noticed
> that if I remove CONFIG_HIGHMEM from my configuration, I am able to boot
> consistently without running into this problem. Is there anyone else
> experiencing this, or does anyone have any suggestions?
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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