From: David S. Miller <davem@davemloft.net>
Date: Wed, 26 Mar 2008 11:51:12 +0000 (-0700)
Subject: [SPARC64]: flush_ptrace_access() needs preemption disable.
X-Git-Tag: v2.6.25-rc8~78^2~1
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6a843d939ade435e060d580f5c56d958464f8a5;p=linux-2.6

[SPARC64]: flush_ptrace_access() needs preemption disable.

Based upon a report by Mariusz Kozlowski.

Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/sparc64/kernel/ptrace.c b/arch/sparc64/kernel/ptrace.c
index bcf58ece2b..aaae865e79 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 {