Re: [uml-devel] [mgedmin@b4net.lt: Bug#256873: user-mode-linux: fails to start (kernel panic)]

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

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Alle 20:27, martedì 29 giugno 2004, Matt Zimmerman ha scritto:
> I am receiving many reports from my users that 2.4.26-1um is less
> functional than past versions, especially (but not exclusively) where
> hostfs is concerned.  Are others experiencing problems as well?  I am
> considering reverting the Debian packages to 2.4.24-1um, which was the last
> version which was stable for me (it had only one frustrating hostfs bug,
> where readdir() would read forever).

I definitely agree. There are some bugfix from 2.4.24-2 to add there, but they 
can wait for now (they are far less fatal). Also, the attached patch is 
needed as forward-port to 2.4.26: use vanilla 2.4.26+ 2.4.24-1um + the 
attached fixlet. Don't downgrade to the security-bugged 2.4.24/.25.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729

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--- linux-2.4.26/include/asm-um/system-i386.h	Wed Apr 21 15:33:45 2004
+++ linux-2.4.26-umlfix/include/asm-um/system-i386.h	Wed Apr 21 15:27:14 2004
@@ -5,35 +5,4 @@
 
 #define __HAVE_ARCH_CMPXCHG 1
 
-static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
-				      unsigned long new, int size)
-{
-	unsigned long prev;
-	switch (size) {
-	case 1:
-		__asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2"
-				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-				     : "memory");
-		return prev;
-	case 2:
-		__asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2"
-				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-				     : "memory");
-		return prev;
-	case 4:
-		__asm__ __volatile__(LOCK_PREFIX "cmpxchgl %1,%2"
-				     : "=a"(prev)
-				     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-				     : "memory");
-		return prev;
-	}
-	return old;
-}
-
-#define cmpxchg(ptr,o,n)\
-	((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
-					(unsigned long)(n),sizeof(*(ptr))))
-    
 #endif