From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 7 Aug 2012 13:09:17 +0000 (+0200)
Subject: eliminate lock profile pointer from spinlock structure when !LOCK_PROFILE
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~8067
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=2a9fbb27320c7cdf0a58003c7e8d752def737ecd;p=xen.git

eliminate lock profile pointer from spinlock structure when !LOCK_PROFILE

This pointer is never used for anything, and needlessly increases the
memory footprint of various pieces of data.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Keir Fraser <keir@xen.org>
---

diff --git a/xen/include/xen/spinlock.h b/xen/include/xen/spinlock.h
index 8133fe0934..76581c5cc2 100644
--- a/xen/include/xen/spinlock.h
+++ b/xen/include/xen/spinlock.h
@@ -115,11 +115,10 @@ extern void spinlock_profile_reset(unsigned char key);
 
 #else
 
-struct lock_profile { };
 struct lock_profile_qhead { };
 
 #define SPIN_LOCK_UNLOCKED                                                    \
-    { _RAW_SPIN_LOCK_UNLOCKED, 0xfffu, 0, _LOCK_DEBUG, NULL }
+    { _RAW_SPIN_LOCK_UNLOCKED, 0xfffu, 0, _LOCK_DEBUG }
 #define DEFINE_SPINLOCK(l) spinlock_t l = SPIN_LOCK_UNLOCKED
 
 #define spin_lock_init_prof(s, l) spin_lock_init(&((s)->l))
@@ -133,7 +132,9 @@ typedef struct spinlock {
     u16 recurse_cpu:12;
     u16 recurse_cnt:4;
     struct lock_debug debug;
+#ifdef LOCK_PROFILE
     struct lock_profile *profile;
+#endif
 } spinlock_t;