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Subject: Re: svn commit: r335094 - head/sys/ofed/drivers/infiniband/core
To: Bruce Evans <brde@optusnet.com.au>
Cc: Matthew Macy <mmacy@freebsd.org>, Ryan Libby <rlibby@freebsd.org>,
 src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org,
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References: <201806132330.w5DNUsrE043573@repo.freebsd.org>
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From: Hans Petter Selasky <hps@selasky.org>
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Date: Thu, 14 Jun 2018 12:50:36 +0200
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On 06/14/18 10:46, Bruce Evans wrote:
> Are these macros for conversion of host (FreeBSD) dev_t's or target (Linux)
> ones?  If for the host, then I don't see any reason not to use the host 
> APIs.
> If for the target, then they shouldn't be used with the host dev_t.  If for
> a mixture, then the translations are very confusing, especially when they
> are the identity, and many more macros are needed to reduce the confusion.

Hi,

These values are only used inside the LinuxKPI for creating character 
devices. They have no exposure to user-space.

Basically:

Z = MKDEV(X,Y)
MAJOR(Z) must be equal to X
MINOR(Z) must be equal to Y

--HPS