linux-kernel - Re: [PATCH 2/2] target: remove spin_lock_assert() in __target_(attach|detach)_tg_pt

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Message-ID: <1521827085.2535.12.camel@wdc.com>
Date:   Fri, 23 Mar 2018 17:44:46 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>,
        "nab@...ux-iscsi.org" <nab@...ux-iscsi.org>
CC:     "daniel@...stot.me" <daniel@...stot.me>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "acme@...nel.org" <acme@...nel.org>,
        "williams@...hat.com" <williams@...hat.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "lclaudio@...hat.com" <lclaudio@...hat.com>,
        "target-devel@...r.kernel.org" <target-devel@...r.kernel.org>,
        "linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH 2/2] target: remove spin_lock_assert() in
 __target_(attach|detach)_tg_pt_gp()

On Fri, 2018-03-23 at 18:19 +0100, bigeasy@...utronix.de wrote:
> __target_attach_tg_pt_gp() and __target_detach_tg_pt_gp() check if the caller
> holds lun_tg_pt_gp_lock(). Both functions are static, the callers are
> acquiring the lock before the invocation of the function so the check
> looks superfluous.
> Remove it.

Does this check cause trouble to anyone or to a specific kernel configuration?
In other words, do we really need to remove these checks? I think that these
checks are useful as documentation to people who read the SCSI target code.
The target code is already hard to follow so I think any documentation,
especially documentation in the form of code that is checked at runtime, is
welcome.

Thanks,

Bart.