linux-kernel - [PATCH v2] xen: remove XEN_PRIVILEGED

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Date:	Tue, 18 Feb 2014 14:07:41 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Michael Opdenacker <michael.opdenacker@...e-electrons.com>,
	Richard Weinberger <richard@....at>, x86@...nel.org,
	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] xen: remove XEN_PRIVILEGED_GUEST

This patch removes the Kconfig symbol XEN_PRIVILEGED_GUEST which is
used nowhere in the tree.

We do know grub2 has a script that greps kernel configuration files for
its macro. It shouldn't do that. As Linus summarized:
    This is a grub bug. It really is that simple. Treat it as one.

Besides, grub2's grepping for that macro is actually superfluous. See,
that script currently contains this test (simplified):
    grep -x CONFIG_XEN_DOM0=y $config || grep -x CONFIG_XEN_PRIVILEGED_GUEST=y $config

But since XEN_DOM0 and XEN_PRIVILEGED_GUEST are by definition equal,
removing XEN_PRIVILEGED_GUEST cannot influence this test.

So there's no reason to not remove this symbol, like we do with all
unused Kconfig symbols.

[pebolle@...cali.nl: rewrote commit explanation.]
Signed-off-by: Michael Opdenacker <michael.opdenacker@...e-electrons.com>
Signed-off-by: Paul Bolle <pebolle@...cali.nl>
---
v2: added a few lines to the commit explanation to show grub2's test for
this symbol is superfluous anyway. Still only git "grep tested".

 arch/x86/xen/Kconfig | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 01b9026..512219d 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -19,11 +19,6 @@ config XEN_DOM0
 	depends on XEN && PCI_XEN && SWIOTLB_XEN
 	depends on X86_LOCAL_APIC && X86_IO_APIC && ACPI && PCI
 
-# Dummy symbol since people have come to rely on the PRIVILEGED_GUEST
-# name in tools.
-config XEN_PRIVILEGED_GUEST
-	def_bool XEN_DOM0
-
 config XEN_PVHVM
 	def_bool y
 	depends on XEN && PCI && X86_LOCAL_APIC
-- 
1.8.5.3

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