linux-kernel - Re: [PATCH] powerpc/papr_scm: Ensure rc is always initialized in papr_scm_pmu

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Date:   Fri, 02 Sep 2022 21:30:52 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Nathan Chancellor <nathan@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Vaibhav Jain <vaibhav@...ux.ibm.com>, llvm@...ts.linux.dev,
        Kajol Jain <kjain@...ux.ibm.com>, patches@...ts.linux.dev,
        Tom Rix <trix@...hat.com>, Nicholas Piggin <npiggin@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH] powerpc/papr_scm: Ensure rc is always initialized in papr_scm_pmu_register()

On Tue, 30 Aug 2022 08:12:56 -0700, Nathan Chancellor wrote:
> Clang warns:
> 
>   arch/powerpc/platforms/pseries/papr_scm.c:492:6: warning: variable 'rc' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
>           if (!p->stat_buffer_len)
>               ^~~~~~~~~~~~~~~~~~~
>   arch/powerpc/platforms/pseries/papr_scm.c:523:64: note: uninitialized use occurs here
>           dev_info(&p->pdev->dev, "nvdimm pmu didn't register rc=%d\n", rc);
>                                                                         ^~
>   include/linux/dev_printk.h:150:67: note: expanded from macro 'dev_info'
>           dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
>                                                                           ^~~~~~~~~~~
>   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
>                   _p_func(dev, fmt, ##__VA_ARGS__);                       \
>                                       ^~~~~~~~~~~
>   arch/powerpc/platforms/pseries/papr_scm.c:492:2: note: remove the 'if' if its condition is always false
>           if (!p->stat_buffer_len)
>           ^~~~~~~~~~~~~~~~~~~~~~~~
>   arch/powerpc/platforms/pseries/papr_scm.c:484:8: note: initialize the variable 'rc' to silence this warning
>           int rc, nodeid;
>                 ^
>                 = 0
>   1 warning generated.
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc/papr_scm: Ensure rc is always initialized in papr_scm_pmu_register()
      https://git.kernel.org/powerpc/c/6cf07810e9ef8535d60160d13bf0fd05f2af38e7

cheers