From: Mariusz Kozlowski <m.kozlowski@xxxxxxxxxx>
Date: Wed, 26 Mar 2008 12:46:53 +0100
> Ok it worked. Now I get a bunch of these:
>
> BUG: using smp_processor_id() in preemptible [00000000] code: pidof/2471
> caller is flush_ptrace_access+0xc0/0x1a0
Here ya go:
commit f6a843d939ade435e060d580f5c56d958464f8a5
Author: David S. Miller <davem@xxxxxxxxxxxxx>
Date: Wed Mar 26 04:51:12 2008 -0700
[SPARC64]: flush_ptrace_access() needs preemption disable.
Based upon a report by Mariusz Kozlowski.
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index bcf58ec..aaae865 100644
--- a/arch/sparc64/kernel/ptrace.c
+++ b/arch/sparc64/kernel/ptrace.c
@@ -70,6 +70,8 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
if (tlb_type == hypervisor)
return;
+ preempt_disable();
+
#ifdef DCACHE_ALIASING_POSSIBLE
/* If bit 13 of the kernel address we used to access the
* user page is the same as the virtual address that page
@@ -108,6 +110,8 @@ void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
for (; start < end; start += icache_line_size)
flushi(start);
}
+
+ preempt_enable();
}
enum sparc_regset {
--
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