gentoo-overlay/app-admin/sysstat/files/sysstat-11.4.3-memalign.patch

sysstat declares 16 bytes alignment for many structs. But realloc does not
guarantee 16 byte alignment (it maxes out at 8 bytes for most systems).
Because of declared 16 byte alignement, the compiler is free to generate SIMD
16 byte loads which require aligned addresses. Use posix_memalign instead to
enforce 16 bytes data alignment to avoid crashes.

https://github.com/sysstat/sysstat/issues/148

Patch by Manoj Gupta <manojgupta@google.com>

--- a/common.h
+++ b/common.h
@@ -11,6 +11,7 @@
 
 #include <time.h>
 #include <sched.h>	/* For __CPU_SETSIZE */
+#include <stdlib.h>
 #include <limits.h>
 
 #ifdef HAVE_SYS_SYSMACROS_H
@@ -91,13 +92,18 @@
    					TYPE *_p_;						 \
 				   	_p_ = S;						 \
    				   	if (SIZE) {						 \
-   				      		if ((S = (TYPE *) realloc(S, (SIZE))) == NULL) { \
+						void *_ptr = NULL;				 \
+						int error = posix_memalign(&_ptr, 16, SIZE);	 \
+						if (error || _ptr == NULL) {			 \
 				         		perror("realloc");			 \
 				         		exit(4);				 \
 				      		}						 \
+						S = (TYPE *)_ptr;				 \
 				      		/* If the ptr was null, then it's a malloc() */	 \
 						if (!_p_) {					 \
 							memset(S, 0, (SIZE));			 \
+						} else {					 \
+							memcpy(S, _p_, (SIZE));			 \
 						}						 \
 				   	}							 \
 					if (!S) {						 \