[Qemu-devel] [PULL 6/8] Fix cacheline detection on FreeBSD/powerpc.

[Laurent Vivier <laurent@vivier.eu>]

From: Justin Hibbits <chmeeedalf@gmail.com>

machdep.cacheline_size is an integer, not a long.  Since PowerPC is
big-endian this causes sysctlbyname() to fill in the upper bits of the
argument, rather than the correct 'lower bits' of the word.  Specify the
correct type to fix this.

Fixes: b255b2c8a548 ("util: add cacheinfo")
Signed-off-by: Justin Hibbits <chmeeedalf@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Tested-by: Justin Hibbits <chmeeedalf@gmail.com>
Message-Id: <20190821082546.5252-2-laurent@vivier.eu>
---
 util/cacheinfo.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/util/cacheinfo.c b/util/cacheinfo.c
index eebe1ce9c5d2..ea6f3e99bf4a 100644
--- a/util/cacheinfo.c
+++ b/util/cacheinfo.c
@@ -65,25 +65,28 @@ static void sys_cache_info(int *isize, int *dsize)
     g_free(buf);
 }
 
-#elif defined(__APPLE__) \
-      || defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#elif defined(__APPLE__)
 # include <sys/sysctl.h>
-# if defined(__APPLE__)
-#  define SYSCTL_CACHELINE_NAME "hw.cachelinesize"
-# else
-#  define SYSCTL_CACHELINE_NAME "machdep.cacheline_size"
-# endif
-
 static void sys_cache_info(int *isize, int *dsize)
 {
     /* There's only a single sysctl for both I/D cache line sizes.  */
     long size;
     size_t len = sizeof(size);
-    if (!sysctlbyname(SYSCTL_CACHELINE_NAME, &size, &len, NULL, 0)) {
+    if (!sysctlbyname("hw.cachelinesize", &size, &len, NULL, 0)) {
+        *isize = *dsize = size;
+    }
+}
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+# include <sys/sysctl.h>
+static void sys_cache_info(int *isize, int *dsize)
+{
+    /* There's only a single sysctl for both I/D cache line sizes.  */
+    int size;
+    size_t len = sizeof(size);
+    if (!sysctlbyname("machdep.cacheline_size", &size, &len, NULL, 0)) {
         *isize = *dsize = size;
     }
 }
-
 #else
 /* POSIX */
 
-- 
2.21.0