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

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Message-ID: <CY4PR21MB0773BB754D1B949C43B591FCDC180@CY4PR21MB0773.namprd21.prod.outlook.com>
Date:   Sat, 15 Sep 2018 23:26:53 +0000
From:   "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>
CC:     "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()

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?

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.

Michael