linux-kernel - Re: [PATCH] IB/hfi1: Fix logical condition in msix_request

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Date:   Fri, 17 Jan 2020 12:14:29 -0500
From:   Dennis Dalessandro <dennis.dalessandro@...el.com>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] IB/hfi1: Fix logical condition in msix_request_irq

On 1/16/2020 5:26 PM, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/infiniband/hw/hfi1/msix.c:136:22: warning: overlapping
> comparisons always evaluate to false [-Wtautological-overlap-compare]
>          if (type < IRQ_SDMA && type >= IRQ_OTHER)
>              ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
> 1 warning generated.
> 
> It is impossible for something to be less than 0 (IRQ_SDMA) and greater
> than or equal to 3 (IRQ_OTHER) at the same time. A logical OR should
> have been used to keep the same logic as before.
> 
> Link: https://github.com/ClangBuiltLinux/linux/issues/841
> Fixes: 13d2a8384bd9 ("IB/hfi1: Decouple IRQ name from type")
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Acked-by: Dennis Dalessandro <dennis.dalessandro@...el.com>