[xen stable-4.15] xl: move freemem()'s "credit expired" loop exit

[patchbot@xxxxxxx]

commit c37099426ea678c1d5b6c99ae5ad6834f4edd2e6
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Jul 27 09:29:31 2022 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Jul 27 09:29:31 2022 +0200

    xl: move freemem()'s "credit expired" loop exit
    
    Move the "credit expired" loop exit to the middle of the loop,
    immediately after "return true". This way having reached the goal on the
    last iteration would be reported as success to the caller, rather than
    as "timed out".
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    master commit: d8f8cb8bdd02fad3b6986ae93511f750fa7f7e6a
    master date: 2022-07-18 17:48:18 +0200
---
 tools/xl/xl_vmcontrol.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/xl/xl_vmcontrol.c b/tools/xl/xl_vmcontrol.c
index 5dee7730ca..d1c6f8aae6 100644
--- a/tools/xl/xl_vmcontrol.c
+++ b/tools/xl/xl_vmcontrol.c
@@ -332,7 +332,7 @@ static bool freemem(uint32_t domid, libxl_domain_config 
*d_config)
     if (rc < 0)
         return false;
 
-    do {
+    for (;;) {
         time_t start;
 
         rc = libxl_get_free_memory(ctx, &free_memkb);
@@ -342,6 +342,9 @@ static bool freemem(uint32_t domid, libxl_domain_config 
*d_config)
         if (free_memkb >= need_memkb)
             return true;
 
+        if (credit <= 0)
+            return false;
+
         rc = libxl_set_memory_target(ctx, 0, free_memkb - need_memkb, 1, 0);
         if (rc < 0)
             return false;
@@ -354,9 +357,7 @@ static bool freemem(uint32_t domid, libxl_domain_config 
*d_config)
             return false;
 
         credit -= difftime(time(NULL), start);
-    } while (credit > 0);
-
-    return false;
+    }
 }
 
 static void reload_domain_config(uint32_t domid,
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.15