lib: dhry: fix sleeping allocations inside non-preemptable section
authorGeert Uytterhoeven <geert+renesas@glider.be>
Wed, 5 Jul 2023 14:54:04 +0000 (16:54 +0200)
committerAndrew Morton <akpm@linux-foundation.org>
Sat, 8 Jul 2023 16:29:32 +0000 (09:29 -0700)
commit8ba388c06bc8056935ec1814b2689bfb42f3b89a
treec63f71f7e9d6220924bef8e4efebc00ebc5efd98
parentfdb54d96600aafe45951f549866cd6fc1af59954
lib: dhry: fix sleeping allocations inside non-preemptable section

The Smatch static checker reports the following warnings:

    lib/dhry_run.c:38 dhry_benchmark() warn: sleeping in atomic context
    lib/dhry_run.c:43 dhry_benchmark() warn: sleeping in atomic context

Indeed, dhry() does sleeping allocations inside the non-preemptable
section delimited by get_cpu()/put_cpu().

Fix this by using atomic allocations instead.
Add error handling, as atomic these allocations may fail.

Link: https://lkml.kernel.org/r/bac6d517818a7cd8efe217c1ad649fffab9cc371.1688568764.git.geert+renesas@glider.be
Fixes: 13684e966d46283e ("lib: dhry: fix unstable smp_processor_id(_) usage")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/0469eb3a-02eb-4b41-b189-de20b931fa56@moroto.mountain
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
lib/dhry_1.c