sched, cpusets: fix warning in kernel/cpuset.c

this warning:

  kernel/cpuset.c: In function ‘generate_sched_domains’:
  kernel/cpuset.c:588: warning: ‘ndoms’ may be used uninitialized in this function

triggers because GCC does not recognize that ndoms stays uninitialized
only if doms is NULL - but that flow is covered at the end of
generate_sched_domains().

Help out GCC by initializing this variable to 0. (that's prudent anyway)

Also, this function needs a splitup and code flow simplification:
with 160 lines length it's clearly too long.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index da7ff61..96c0ba1 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -585,7 +585,7 @@ static int generate_sched_domains(cpumask_t **domains,
        int i, j, k;            /* indices for partition finding loops */
        cpumask_t *doms;        /* resulting partition; i.e. sched domains */
        struct sched_domain_attr *dattr;  /* attributes for custom domains */
-       int ndoms;              /* number of sched domains in result */
+       int ndoms = 0;          /* number of sched domains in result */
        int nslot;              /* next empty doms[] cpumask_t slot */
 
        doms = NULL;