printk: remove unneeded dead-store assignment

make clang-analyzer on x86_64 defconfig caught my attention with:

  kernel/printk/printk_ringbuffer.c:885:3: warning:
  Value stored to 'desc' is never read [clang-analyzer-deadcode.DeadStores]

		desc = to_desc(desc_ring, head_id);
		^

Commit b6cf8b3f3312 ("printk: add lockless ringbuffer") introduced
desc_reserve() with this unneeded dead-store assignment.

As discussed with John Ogness privately, this is probably just some minor
left-over from previous iterations of the ringbuffer implementation. So,
simply remove this unneeded dead assignment to make clang-analyzer happy.

As compilers will detect this unneeded assignment and optimize this anyway,
the resulting object code is identical before and after this change.

No functional change. No change to object code.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20201106034005.18822-1-lukas.bulwahn@gmail.com

diff --git a/kernel/printk/printk_ringbuffer.c b/kernel/printk/printk_ringbuffer.c
index 24a960a89aa890e2b6c8ae467970b2d792f12b97..dd43c4cf16fb51c5462aeb627303242170212ae5 100644 (file)
--- a/kernel/printk/printk_ringbuffer.c
+++ b/kernel/printk/printk_ringbuffer.c
@@ -882,8 +882,6 @@ static bool desc_reserve(struct printk_ringbuffer *rb, unsigned long *id_out)
        head_id = atomic_long_read(&desc_ring->head_id); /* LMM(desc_reserve:A) */
 
        do {
-               desc = to_desc(desc_ring, head_id);
-
                id = DESC_ID(head_id + 1);
                id_prev_wrap = DESC_ID_PREV_WRAP(desc_ring, id);