Subject: linux-next: build failure after merge of the pm tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 4 Jan 2022 11:15:51 +1100

Hi all,

After merging the pm tree, today's linux-next build (x86_84 allmodconfig)
failed like this:

sound/soc/sh/rz-ssi.c: In function 'rz_ssi_probe':
sound/soc/sh/rz-ssi.c:1023:2: error: ignoring return value of 'pm_runtime_resume_and_get' declared with attribute 'warn_unused_result' [-Werror=unused-result]
 1023 |  pm_runtime_resume_and_get(&pdev->dev);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Caused by commit

  877d952c261e ("PM: runtime: Annotate pm_runtime_resume_and_get() as __must_check")

This also produced the following warnings in my arm multi_v7_defconfig
build:

drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_hw_init':
drivers/crypto/stm32/stm32-hash.c:816:2: warning: ignoring return value of 'pm_runtime_resume_and_get' declared with attribute 'warn_unused_result' [-Wunused-result]
  816 |  pm_runtime_resume_and_get(hdev->dev);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_import':
drivers/crypto/stm32/stm32-hash.c:1003:2: warning: ignoring return value of 'pm_runtime_resume_and_get' declared with attribute 'warn_unused_result' [-Wunused-result]
 1003 |  pm_runtime_resume_and_get(hdev->dev);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/crypto/stm32/stm32-hash.c: In function 'stm32_hash_export':
drivers/crypto/stm32/stm32-hash.c:965:2: warning: ignoring return value of 'pm_runtime_resume_and_get' declared with attribute 'warn_unused_result' [-Wunused-result]
  965 |  pm_runtime_resume_and_get(hdev->dev);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/crypto/stm32/stm32-cryp.c: In function 'stm32_cryp_hw_init':
drivers/crypto/stm32/stm32-cryp.c:545:2: warning: ignoring return value of 'pm_runtime_resume_and_get' declared with attribute 'warn_unused_result' [-Wunused-result]
  545 |  pm_runtime_resume_and_get(cryp->dev);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I have used the pm tree from next-20211224 for today.

-- 
Cheers,
Stephen Rothwell