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From: Dwaipayan Ray <dwaipayanray1@gmail.com>
To: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees] checkpatch.pl investigation: NO_AUTHOR_SIGN_OFF issues
Date: Mon, 28 Sep 2020 19:00:27 +0530	[thread overview]
Message-ID: <CABJPP5A46fh=Eth7RwXYHarcS11kyHMCUMrRfvvJ3_8oafAkJA@mail.gmail.com> (raw)
In-Reply-To: <CABJPP5B8mfAi3MMS4xWbArJe=FcMBTF9U8qvXmaicGj5WKiGBQ@mail.gmail.com>

Hi,
I am continuing this thread, but am writing about another issue
separate from author sign off. While checking checkpatch
output, I was checking the commits with the warnings:

WARNING:UNNECESSARY_ELSE: else is not generally
 useful after a break or return

Looking into the referenced section, I found some
sections with a redundant else.

For example: (revision 196273fffc1c),
arch/powerpc/kernel/security.c , line 360:

static int ssb_prctl_get(struct task_struct *task)
{
if (stf_enabled_flush_types == STF_BARRIER_NONE)
/*
* We don't have an explicit signal from firmware that we're
* vulnerable or not, we only have certain CPU revisions that
* are known to be vulnerable.
*
* We assume that if we're on another CPU, where the barrier is
* NONE, then we are not vulnerable.
*/
return PR_SPEC_NOT_AFFECTED;
else
/*
* If we do have a barrier type then we are vulnerable. The
* barrier is not a global or per-process mitigation, so the
* only value we can report here is PR_SPEC_ENABLE, which
* appears as "vulnerable" in /proc.
*/
return PR_SPEC_ENABLE;

return -EINVAL;
}

The else is pretty much redundant and the control flow
never reaches to return -EINVAL.

Is it possible to clean up all these redundant code?

Thanks,
Dwaipayan.
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  reply	other threads:[~2020-09-28 13:30 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-18 10:06 [Linux-kernel-mentees] checkpatch.pl investigation: NO_AUTHOR_SIGN_OFF issues Lukas Bulwahn
2020-09-18 10:29 ` Dwaipayan Ray
2020-09-18 10:44   ` Lukas Bulwahn
2020-09-21  9:07     ` Dwaipayan Ray
2020-09-21  9:12       ` Lukas Bulwahn
2020-09-21  9:15       ` Lukas Bulwahn
2020-09-22 13:21         ` Dwaipayan Ray
2020-09-22 18:38           ` Lukas Bulwahn
2020-09-22 19:08             ` Dwaipayan Ray
2020-09-23  7:32               ` Lukas Bulwahn
2020-09-23  7:38                 ` Dwaipayan Ray
2020-09-23  7:42                   ` Lukas Bulwahn
2020-09-25  4:18                     ` Dwaipayan Ray
2020-09-25  7:20                       ` Lukas Bulwahn
2020-09-25  7:29                         ` Dwaipayan Ray
2020-09-25  7:35                           ` Lukas Bulwahn
2020-09-26 11:31                             ` Dwaipayan Ray
2020-09-28 13:30                               ` Dwaipayan Ray [this message]
2020-09-28 14:09                                 ` Lukas Bulwahn
2020-09-28 14:20                                   ` Dwaipayan Ray
2020-09-28 15:09                                     ` Lukas Bulwahn
2020-09-28 15:06                               ` Lukas Bulwahn

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