* [sparc] Add bugfix/sparc/t1k-cpu-lockup.patch (thanks to David Miller)

to prevent soft CPU lockup on T1000 servers, which can be triggered from
    userspace, resulting in denial of service.
  Ref: http://marc.theaimsgroup.com/?t=116241422600003&r=1&w=2

svn path=/dists/trunk/linux-2.6/; revision=7684

debian/changelog

@@ -23,6 +23,9 @@ linux-2.6 (2.6.18-4) UNRELEASED; urgency=low
     (closes: #394697).
   * [sparc] Add bugfix/sparc/sunblade1k-boot-fix.patch (thanks to David
     Miller) to fix a boottime crash on SunBlade1000.
+  * [sparc] Add bugfix/sparc/t1k-cpu-lockup.patch (thanks to David Miller)
+    to prevent soft CPU lockup on T1000 servers, which can be triggered from
+    userspace, resulting in denial of service.
 
   [ Martin Michlmayr ]
   * arm/iop32x: Fix the interrupt of the 2nd Ethernet slot on N2100.

debian/patches/bugfix/sparc/t1k-cpu-lockup.patch

@@ -0,0 +1,37 @@
+diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h
+index dee4020..7392fc4 100644
+--- a/include/asm-sparc64/futex.h
++++ b/include/asm-sparc64/futex.h
+@@ -87,24 +87,22 @@ static inline int
+ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
+ {
+ 	__asm__ __volatile__(
+-	"\n1:	lduwa	[%2] %%asi, %0\n"
+-	"2:	casa	[%2] %%asi, %0, %1\n"
+-	"3:\n"
++	"\n1:	casa	[%3] %%asi, %2, %0\n"
++	"2:\n"
+ 	"	.section .fixup,#alloc,#execinstr\n"
+ 	"	.align	4\n"
+-	"4:	ba	3b\n"
+-	"	 mov	%3, %0\n"
++	"3:	ba	2b\n"
++	"	 mov	%4, %0\n"
+ 	"	.previous\n"
+ 	"	.section __ex_table,\"a\"\n"
+ 	"	.align	4\n"
+-	"	.word	1b, 4b\n"
+-	"	.word	2b, 4b\n"
++	"	.word	1b, 3b\n"
+ 	"	.previous\n"
+-	: "=&r" (oldval)
+-	: "r" (newval), "r" (uaddr), "i" (-EFAULT)
++	: "=r" (newval)
++	: "0" (newval), "r" (oldval), "r" (uaddr), "i" (-EFAULT)
+ 	: "memory");
+ 
+-	return oldval;
++	return newval;
+ }
+ 
+ #endif /* !(_SPARC64_FUTEX_H) */

debian/patches/series/4

@@ -41,3 +41,4 @@
 + features/mips/qemu-kernel.patch
 + features/mips/backtrace.patch
 + features/fintek-f75375.patch
++ bugfix/sparc/t1k-cpu-lockup.patch