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Subject[PATCH] lib: dhry: Fix unstable smp_processor_id(_) usage
Date
When running the in-kernel Dhrystone benchmark with
CONFIG_DEBUG_PREEMPT=y:

BUG: using smp_processor_id() in preemptible [00000000] code: bash/938

Fix this by not using smp_processor_id() directly, but instead wrapping
the whole benchmark inside a get_cpu()/put_cpu() pair. This makes sure
the whole benchmark is run on the same CPU core, and the reported values
are consistent.

Fixes: d5528cc16893f1f6 ("lib: add Dhrystone benchmark test")
Reported-by: Tobias Klausmann <klausman@schwarzvogel.de>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=217179
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
lib/dhry_run.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/dhry_run.c b/lib/dhry_run.c
index f9d33efa6d090604..f15ac666e9d38bd2 100644
--- a/lib/dhry_run.c
+++ b/lib/dhry_run.c
@@ -31,6 +31,7 @@ MODULE_PARM_DESC(iterations,

static void dhry_benchmark(void)
{
+ unsigned int cpu = get_cpu();
int i, n;

if (iterations > 0) {
@@ -45,9 +46,10 @@ static void dhry_benchmark(void)
}

report:
+ put_cpu();
if (n >= 0)
- pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n",
- smp_processor_id(), n, n / DHRY_VAX);
+ pr_info("CPU%u: Dhrystones per Second: %d (%d DMIPS)\n", cpu,
+ n, n / DHRY_VAX);
else if (n == -EAGAIN)
pr_err("Please increase the number of iterations\n");
else
--
2.34.1
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