linux-kernel - [PATCH v2] perf/arm_pmu_platform: Fix an error message related to dev_err

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Date:   Fri,  5 Aug 2022 22:55:30 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2] perf/arm_pmu_platform: Fix an error message related to dev_err_probe() usage

dev_err() is a macro that expand dev_fmt, but dev_err_probe() is a
function and cannot perform this macro expansion.

So hard code the "hw perfevents: " prefix and dd a comment explaining why.

Fixes: 11fa1dc8020a ("perf/arm_pmu_platform: Use dev_err_probe() for IRQ errors")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Untested, but I can't see how it could work.

v1 --> v2
  - fix a typo in the comment
---
 drivers/perf/arm_pmu_platform.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/arm_pmu_platform.c b/drivers/perf/arm_pmu_platform.c
index 513de1f54e2d..02cca4b8f0fd 100644
--- a/drivers/perf/arm_pmu_platform.c
+++ b/drivers/perf/arm_pmu_platform.c
@@ -101,8 +101,11 @@ static int pmu_parse_irqs(struct arm_pmu *pmu)
 	struct device *dev = &pdev->dev;
 
 	num_irqs = platform_irq_count(pdev);
-	if (num_irqs < 0)
-		return dev_err_probe(dev, num_irqs, "unable to count PMU IRQs\n");
+	if (num_irqs < 0) {
+		/* dev_err_probe() does not handle dev_fmt, so hard-code the prefix */
+		return dev_err_probe(dev, num_irqs,
+				     "hw perfevents: unable to count PMU IRQs\n");
+	}
 
 	/*
 	 * In this case we have no idea which CPUs are covered by the PMU.
-- 
2.34.1