bpf: work around -Wuninitialized warning

Splitting these out into separate helper functions means that we
actually pass an uninitialized variable into another function call
if dec_active() happens to not be inlined, and CONFIG_PREEMPT_RT
is disabled:

kernel/bpf/memalloc.c: In function 'add_obj_to_free_list':
kernel/bpf/memalloc.c:200:9: error: 'flags' is used uninitialized [-Werror=uninitialized]
  200 |         dec_active(c, flags);

Avoid this by passing the flags by reference, so they either get
initialized and dereferenced through a pointer, or the pointer never
gets accessed at all.

Fixes: 18e027b1c7c6d ("bpf: Factor out inc/dec of active flag into helpers.")
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20230725202653.2905259-1-arnd@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/kernel/bpf/memalloc.c b/kernel/bpf/memalloc.c
index 51d6389..14d9b1a 100644 (file)
--- a/kernel/bpf/memalloc.c
+++ b/kernel/bpf/memalloc.c
@@ -183,11 +183,11 @@ static void inc_active(struct bpf_mem_cache *c, unsigned long *flags)
        WARN_ON_ONCE(local_inc_return(&c->active) != 1);
 }
 
-static void dec_active(struct bpf_mem_cache *c, unsigned long flags)
+static void dec_active(struct bpf_mem_cache *c, unsigned long *flags)
 {
        local_dec(&c->active);
        if (IS_ENABLED(CONFIG_PREEMPT_RT))
-               local_irq_restore(flags);
+               local_irq_restore(*flags);
 }
 
 static void add_obj_to_free_list(struct bpf_mem_cache *c, void *obj)
@@ -197,7 +197,7 @@ static void add_obj_to_free_list(struct bpf_mem_cache *c, void *obj)
        inc_active(c, &flags);
        __llist_add(obj, &c->free_llist);
        c->free_cnt++;
-       dec_active(c, flags);
+       dec_active(c, &flags);
 }
 
 /* Mostly runs from irq_work except __init phase. */
@@ -344,7 +344,7 @@ static void free_bulk(struct bpf_mem_cache *c)
                        cnt = --c->free_cnt;
                else
                        cnt = 0;
-               dec_active(c, flags);
+               dec_active(c, &flags);
                if (llnode)
                        enque_to_free(tgt, llnode);
        } while (cnt > (c->high_watermark + c->low_watermark) / 2);
@@ -384,7 +384,7 @@ static void check_free_by_rcu(struct bpf_mem_cache *c)
                llist_for_each_safe(llnode, t, llist_del_all(&c->free_llist_extra_rcu))
                        if (__llist_add(llnode, &c->free_by_rcu))
                                c->free_by_rcu_tail = llnode;
-               dec_active(c, flags);
+               dec_active(c, &flags);
        }
 
        if (llist_empty(&c->free_by_rcu))
@@ -408,7 +408,7 @@ static void check_free_by_rcu(struct bpf_mem_cache *c)
        inc_active(c, &flags);
        WRITE_ONCE(c->waiting_for_gp.first, __llist_del_all(&c->free_by_rcu));
        c->waiting_for_gp_tail = c->free_by_rcu_tail;
-       dec_active(c, flags);
+       dec_active(c, &flags);
 
        if (unlikely(READ_ONCE(c->draining))) {
                free_all(llist_del_all(&c->waiting_for_gp), !!c->percpu_size);