linux-kernel - Re: [PATCH] Drivers: hv: vmbus: include header for get_irq

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Message-ID: <20180917075418.e67gzam25zrkjpc4@linutronix.de>
Date:   Mon, 17 Sep 2018 09:54:18 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
Cc:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Bernhard Landauer <oberon@...jaro.org>,
        Ralf Ramsauer <ralf.ramsauer@...-regensburg.de>
Subject: Re: [PATCH] Drivers: hv: vmbus: include header for get_irq_regs()

On 2018-09-15 23:26:53 [+0000], Michael Kelley (EOSG) wrote:
> From Sebastian Andrzej Siewior   Sent: Thursday, August 30, 2018 12:55 AM
> > 
> > On !RT the header file get_irq_regs() gets pulled in via other header files. On
> > RT it does not and the build fails:
> > 
> >     drivers/hv/vmbus_drv.c:975 implicit declaration of function ‘get_irq_regs’ [-
> > Werror=implicit-function-declaration]
> >     drivers/hv/hv.c:115 implicit declaration of function ‘get_irq_regs’ [-Werror=implicit-
> > function-declaration]
> > 
> > Add the header file for get_irq_regs() in a common header so it used by
> > vmbus_drv.c by hv.c for their get_irq_regs() usage.
> > 
> 
> get_irq_regs() is not used explicitly in either vmbus_drv.c or in hv.c.  And I
> couldn't make the line numbers in the errors above line up with anything
> in the source code that might be implicitly using get_irq_regs().  Is it the
> calls to add_interrupt_randomness()?   Did you figure out
> exactly what line of code is causing the compile error?

The line mentioned in the patch, is correct. I just figured out that
function is added as part preempt-RT.

> I'm wondering whether adding the #include of irq.h into hyperv_vmbus.h
> is really the right solution.  More correct might be to have the file where
> get_irq_regs() is actually used to #include irq_regs.h.

nah, leave it. I'm sorry, that I haven't seen it earlier. I will submit
a complete patch once I get there. It popped during a stable update so I
assumed it was something that came via stable but it actually was there
the whole time. Again, sorry for the noise.

> Michael

Sebastian