[parisc-linux] db3/db4 patch for Linux/HPPA (fwd)

[Jochen Friedrich]

Hi,

the same applies to 4.0.14, as well.

Cheers,
--jochen
---------- Forwarded message ----------
Date: Fri, 16 Aug 2002 07:54:04 +0200 (CEST)
From: Jochen Friedrich <jochen@scram.de>
To: Matthew Wilcox <willy@debian.org>
Cc: HP900 PARISC mailing list <parisc-linux@lists.parisc-linux.org>
Subject: [parisc-linux] db3 patch for Linux/HPPA

Hi Matthew,

this fixes a problem with db3 mutexes. Problem is in
__db_tas_mutex_init(). If MUTEX_INIT returns non-zero value, mutexp->spins
doesn't get initialized and later __db_tas_mutex_lock loops without ever
trying to aquire the lock (as spins is zero).

diff -urN db-3.2.9/include/mutex.h db-3.2.9.new/include/mutex.h
--- db-3.2.9/include/mutex.h    Sun Jun 23 16:34:28 2002
+++ db-3.2.9.new/include/mutex.h        Sun Jun 23 16:33:38 2002
@@ -413,7 +413,7 @@
        __r & 1;                                                        \
 })

-#define        MUTEX_UNSET(tsl)        (*(tsl) = -1)
+#define        MUTEX_UNSET(tsl)        (!(*(tsl) = -1))
 #define        MUTEX_INIT(tsl)         MUTEX_UNSET(tsl)
 #endif
 #endif

Cheers,
--jochen

_______________________________________________
parisc-linux mailing list
parisc-linux@lists.parisc-linux.org
http://lists.parisc-linux.org/mailman/listinfo/parisc-linux