[PATCH] x86_64: Add compat_printk and sysctl to turn off compat layer warnings

Sometimes e.g. with crashme the compat layer warnings can be noisy.
Add a way to turn them off by gating all output through compat_printk
that checks a global sysctl. The default is not changed.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index dda1697ec753..9760753e662b 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -226,5 +226,7 @@ static inline int compat_timespec_compare(struct compat_timespec *lhs,
 
 asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp);
 
+extern int compat_printk(const char *fmt, ...);
+
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */
diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 6a60770984e9..349ef908a222 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -148,9 +148,11 @@ enum
         KERN_SPIN_RETRY=70,     /* int: number of spinlock retries */
         KERN_ACPI_VIDEO_FLAGS=71, /* int: flags for setting up video after ACPI sleep */
         KERN_IA64_UNALIGNED=72, /* int: ia64 unaligned userland trap enable */
+        KERN_COMPAT_LOG=73,     /* int: print compat layer  messages */
 };
 
 
+
 /* CTL_VM names: */
 enum
 {