padata: Check for valid padata instance on start
This patch introduces the PADATA_INVALID flag which is
checked on padata start. This will be used to mark a padata
instance as invalid, if the padata cpumask does not intersect
with the active cpumask. we change padata_start to return an
error if the PADATA_INVALID is set. Also we adapt the only
padata user, pcrypt to this change.
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 8d84062..e4c17f9 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -126,6 +126,7 @@
u8 flags;
#define PADATA_INIT 1
#define PADATA_RESET 2
+#define PADATA_INVALID 4
};
extern struct padata_instance *padata_alloc(const struct cpumask *cpumask,
@@ -138,6 +139,6 @@
cpumask_var_t cpumask);
extern int padata_add_cpu(struct padata_instance *pinst, int cpu);
extern int padata_remove_cpu(struct padata_instance *pinst, int cpu);
-extern void padata_start(struct padata_instance *pinst);
+extern int padata_start(struct padata_instance *pinst);
extern void padata_stop(struct padata_instance *pinst);
#endif