[Qemu-devel] [PATCH] oslib-posix: Fix compiler warning (-Wclobbered) and simplify the code

[Stefan Weil <sw@weilnetz.de>]

gcc reports this warning with -Wclobbered:

util/oslib-posix.c: In function ‘os_mem_prealloc’:
util/oslib-posix.c:374:49: error: argument ‘memory’ might be clobbered by
 ‘longjmp’ or ‘vfork’ [-Werror=clobbered]

Fix this and simplify the code by using an existing macro.

Signed-off-by: Stefan Weil <sw@weilnetz.de>
---
 util/oslib-posix.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 16fcec2..37ffd96 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -399,10 +399,10 @@ void os_mem_prealloc(int fd, char *area, size_t memory)
     } else {
         int i;
         size_t hpagesize = fd_getpagesize(fd);
+        size_t numpages = DIV_ROUND_UP(memory, hpagesize);
 
         /* MAP_POPULATE silently ignores failures */
-        memory = (memory + hpagesize - 1) & -hpagesize;
-        for (i = 0; i < (memory / hpagesize); i++) {
+        for (i = 0; i < numpages; i++) {
             memset(area + (hpagesize * i), 0, 1);
         }
 
-- 
1.7.10.4