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From: Paul Burton <paul.burton@mips.com>
To: Nathan Chancellor <natechancellor@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>,
	Paul Burton <pburton@wavecomp.com>,
	James Hogan <jhogan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	"linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"clang-built-linux@googlegroups.com" 
	<clang-built-linux@googlegroups.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	"linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>
Subject: Re: [PATCH 2/5] MIPS/ptrace: Update mips_get_syscall_arg's return type
Date: Mon, 12 Aug 2019 04:47:19 +0000
Message-ID: <MWHPR2201MB127735989B4545BE3F64C566C1D30@MWHPR2201MB1277.namprd22.prod.outlook.com> (raw)
In-Reply-To: <20190812033120.43013-3-natechancellor@gmail.com>

Hello,

Nathan Chancellor wrote:
> clang warns:
> 
> arch/mips/include/asm/syscall.h:136:3: error: variable 'ret' is
> uninitialized when used here [-Werror,-Wuninitialized]
>                 ret |= mips_get_syscall_arg(args++, task, regs, i++);
>                 ^~~
> arch/mips/include/asm/syscall.h:129:9: note: initialize the variable
> 'ret' to silence this warning
>         int ret;
>                ^
>                 = 0
> 1 error generated.
> 
> It's not wrong; however, it's not an issue in practice because ret is
> only assigned to, not read from. ret could just be initialized to zero
> but looking into it further, ret has been unused since it was first
> added in 2012 so just get rid of it and update mips_get_syscall_arg's
> return type since none of the return values are ever checked. If it is
> ever needed again, this commit can be reverted and ret can be properly
> initialized.

Applied to mips-next.

> commit 077ff3be06e8
> https://git.kernel.org/mips/c/077ff3be06e8
> 
> Fixes: c0ff3c53d4f9 ("MIPS: Enable HAVE_ARCH_TRACEHOOK.")
> Link: https://github.com/ClangBuiltLinux/linux/issues/604
> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
> Signed-off-by: Paul Burton <paul.burton@mips.com>

Thanks,
    Paul

[ This message was auto-generated; if you believe anything is incorrect
  then please email paul.burton@mips.com to report it. ]

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-12  3:31 [PATCH 0/5] Clang build fixes for MIPS Nathan Chancellor
2019-08-12  3:31 ` [PATCH 1/5] MIPS: Don't use bc_false uninitialized in __mm_isBranchInstr Nathan Chancellor
2019-08-12  4:47   ` Paul Burton
2019-08-12  3:31 ` [PATCH 2/5] MIPS/ptrace: Update mips_get_syscall_arg's return type Nathan Chancellor
2019-08-12  4:47   ` Paul Burton [this message]
2019-08-12  3:31 ` [PATCH 3/5] lib/mpi: Fix for building for MIPS32 with Clang Nathan Chancellor
2019-08-12  5:23   ` Nathan Chancellor
2019-08-12  5:26     ` Nathan Chancellor
2019-08-12 12:28       ` Herbert Xu
2019-08-12 17:58     ` Paul Burton
2019-08-12  7:35   ` Jussi Kivilinna
2019-08-12 17:14     ` Nathan Chancellor
2019-08-12 19:40       ` Jussi Kivilinna
2019-08-12 19:45         ` Nathan Chancellor
2019-08-12  3:31 ` [PATCH 4/5] lib/mpi: Fix for building for MIPS64 " Nathan Chancellor
2019-08-12  5:25   ` Nathan Chancellor
2019-08-12 17:42   ` Nick Desaulniers
2019-08-12 17:45     ` Nathan Chancellor
2019-08-12  3:31 ` [PATCH 5/5] MIPS: tlbex: Explicitly cast _PAGE_NO_EXEC to a boolean Nathan Chancellor
2019-08-12  4:47   ` Paul Burton

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