linux-kernel - Re: [PATCH v1 1/1] KVM: arm64: vgic: Replace kernel.h with the necessary inclusions

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Message-ID: <YcN5FKnbT9BHLn9f@smile.fi.intel.com>
Date:   Wed, 22 Dec 2021 21:14:28 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: Re: [PATCH v1 1/1] KVM: arm64: vgic: Replace kernel.h with the
 necessary inclusions

On Wed, Dec 22, 2021 at 08:25:43PM +0200, Andy Shevchenko wrote:
> On Wed, Dec 22, 2021 at 06:09:22PM +0000, Marc Zyngier wrote:
> > On Wed, 22 Dec 2021 16:55:52 +0000,
> > Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:
> > > 
> > > When kernel.h is used in the headers it adds a lot into dependency hell,
> > > especially when there are circular dependencies are involved.
> > 
> > Which circular dependencies? What problem are you solving?
> 
> In particular moving bitmap_*alloc() APIs to the headers.
> 
> But this may be a side effect of what I realized during the attempts
> of solving that issue. In any case there is no need to take entire
> mess of kernel.h in another header.

For the record  `make headerdep` doesn't make any difference with
or without this patch. But I consider it's better not to use kernel.h
in the headers due to a full mess behind it.

-- 
With Best Regards,
Andy Shevchenko