From: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
To: Nathan Chancellor <natechancellor@gmail.com>,
Tyrel Datwyler <tyreld@linux.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>
Cc: linux-pci@vger.kernel.org,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
Bjorn Helgaas <bhelgaas@google.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2] PCI: rpaphp: Avoid a sometimes-uninitialized warning
Date: Mon, 3 Jun 2019 17:03:09 -0700 [thread overview]
Message-ID: <78f5a331-6158-0ef5-0476-b976c8e71a68@linux.vnet.ibm.com> (raw)
In-Reply-To: <20190603221157.58502-1-natechancellor@gmail.com>
On 06/03/2019 03:11 PM, Nathan Chancellor wrote:
> When building with -Wsometimes-uninitialized, clang warns:
>
> drivers/pci/hotplug/rpaphp_core.c:243:14: warning: variable 'fndit' is
> used uninitialized whenever 'for' loop exits because its condition is
> false [-Wsometimes-uninitialized]
> for (j = 0; j < entries; j++) {
> ^~~~~~~~~~~
> drivers/pci/hotplug/rpaphp_core.c:256:6: note: uninitialized use occurs
> here
> if (fndit)
> ^~~~~
> drivers/pci/hotplug/rpaphp_core.c:243:14: note: remove the condition if
> it is always true
> for (j = 0; j < entries; j++) {
> ^~~~~~~~~~~
> drivers/pci/hotplug/rpaphp_core.c:233:14: note: initialize the variable
> 'fndit' to silence this warning
> int j, fndit;
> ^
> = 0
>
> fndit is only used to gate a sprintf call, which can be moved into the
> loop to simplify the code and eliminate the local variable, which will
> fix this warning.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/504
> Fixes: 2fcf3ae508c2 ("hotplug/drc-info: Add code to search ibm,drc-info property")
> Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Tyrel Datwyler <tyreld@linux.ibm.com>
next prev parent reply other threads:[~2019-06-04 0:04 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 17:43 [PATCH] PCI: rpaphp: Avoid a sometimes-uninitialized warning Nathan Chancellor
2019-06-03 21:07 ` Nick Desaulniers
2019-06-03 21:51 ` Nathan Chancellor
2019-06-03 22:11 ` [PATCH v2] " Nathan Chancellor
2019-06-04 0:03 ` Tyrel Datwyler [this message]
2019-06-27 19:18 ` Nathan Chancellor
2019-06-28 2:57 ` Joel Savitz
2019-07-22 2:43 ` Nathan Chancellor
2019-07-22 4:05 ` Michael Ellerman
2019-08-02 0:11 ` Bjorn Helgaas
2019-08-02 12:24 ` Michael Ellerman
2019-08-10 10:20 ` Michael Ellerman
2019-06-04 6:24 ` [PATCH] " Christophe Leroy
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