From: Lars Ellenberg <lars.ellenb...@linbit.com>
Don't error out with misleading "out of memory"
if the cpu-mask has more bits set than there are CPUs.
Just truncate to nr_cpu_ids implicitly.
Signed-off-by: Philipp Reisner <philipp.reis...@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenb...@linbit.com>
---
drivers/block/drbd/drbd_main.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 9712bcc..9b465bb 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -2541,6 +2541,20 @@ int set_resource_options(struct drbd_resource *resource,
struct res_opts *res_op
if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) {
err = bitmap_parse(res_opts->cpu_mask, DRBD_CPU_MASK_SIZE,
cpumask_bits(new_cpu_mask), nr_cpu_ids);
+ if (err == -EOVERFLOW) {
+ /* So what. mask it out. */
+ cpumask_var_t tmp_cpu_mask;
+ if (zalloc_cpumask_var(&tmp_cpu_mask, GFP_KERNEL)) {
+ cpumask_setall(tmp_cpu_mask);
+ cpumask_and(new_cpu_mask, new_cpu_mask,
tmp_cpu_mask);
+ drbd_warn(resource, "Overflow in
bitmap_parse(%.12s%s), truncating to %u bits\n",
+ res_opts->cpu_mask,
+ strlen(res_opts->cpu_mask) > 12 ? "..."
: "",
+ nr_cpu_ids);
+ free_cpumask_var(tmp_cpu_mask);
+ err = 0;
+ }
+ }
if (err) {
drbd_warn(resource, "bitmap_parse() failed with %d\n",
err);
/* retcode = ERR_CPU_MASK_PARSE; */
--
1.9.1
--
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