From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Mon, 1 Dec 2014 08:16:45 +0000 (+0100)
Subject: s390/debug: avoid function call for debug_sprintf_*
X-Git-Tag: omap-for-v3.19/fixes-rc1~124^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=832a771034bf62444796ab8868264c3ea9e50866;p=pandora-kernel.git

s390/debug: avoid function call for debug_sprintf_*

debug_sprintf_event/exception are called even for debug events
with a disabling debug level. All other functions already do
the check in a wrapper function. Lets do the same here.
Due to the var_args the compiler rejects to make this function
inline. So let's wrap this via a macro.
This patch saves around 80 ns on my z196 for a KVM round trip (we
have two debug statements for entry and exit) when KVM is build as
a module.
The savings for built-in drivers is smaller as we then avoid the
PLT overhead for a function call.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

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