linux-kernel - Re: [PATCH] x86/asm/msr: Retract msr-index.h

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Message-ID: <20150604075900.GA3795@pd.tnic>
Date:	Thu, 4 Jun 2015 09:59:00 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	David Howells <dhowells@...hat.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [PATCH] x86/asm/msr: Retract msr-index.h

On Thu, Jun 04, 2015 at 08:09:12AM +0200, Ingo Molnar wrote:
> Something like:
> 
> 	x86/uapi: Remove <asm/msr.h> from the list of exported UAPI headers
> 
> or so would work fine with me.

I did this - this is maximally descriptive IMO. :-)

---
From: Borislav Petkov <bp@...e.de>
Date: Wed, 3 Jun 2015 14:37:05 +0200
Subject: [PATCH] x86/uapi: Do not export <asm/msr-index.h> as part of the user API headers

This header containing all MSRs and respective bit definitions got
exported to userspace in conjunction with the big UAPI shuffle.

But, it doesn't belong in the UAPI headers because userspace can do
its own MSR defines and exporting them from the kernel blocks us from
doing cleanups/renames in that header. Which is ridiculous - it is not
kernel's job to export such a header and keep MSRs list and their names
stable.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: David Howells <dhowells@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: linux-kernel@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: x86@...nel.org
---
 arch/x86/include/{uapi => }/asm/msr-index.h | 0
 arch/x86/include/asm/msr.h                  | 3 ++-
 arch/x86/include/uapi/asm/msr.h             | 2 --
 tools/power/x86/turbostat/Makefile          | 2 +-
 4 files changed, 3 insertions(+), 4 deletions(-)
 rename arch/x86/include/{uapi => }/asm/msr-index.h (100%)

diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
similarity index 100%
rename from arch/x86/include/uapi/asm/msr-index.h
rename to arch/x86/include/asm/msr-index.h
diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index de36f22eb0b9..441ecf83d81a 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -1,13 +1,14 @@
 #ifndef _ASM_X86_MSR_H
 #define _ASM_X86_MSR_H
 
-#include <uapi/asm/msr.h>
+#include "msr-index.h"
 
 #ifndef __ASSEMBLY__
 
 #include <asm/asm.h>
 #include <asm/errno.h>
 #include <asm/cpumask.h>
+#include <uapi/asm/msr.h>
 
 struct msr {
 	union {
diff --git a/arch/x86/include/uapi/asm/msr.h b/arch/x86/include/uapi/asm/msr.h
index 155e51048fa4..c41f4fe25483 100644
--- a/arch/x86/include/uapi/asm/msr.h
+++ b/arch/x86/include/uapi/asm/msr.h
@@ -1,8 +1,6 @@
 #ifndef _UAPI_ASM_X86_MSR_H
 #define _UAPI_ASM_X86_MSR_H
 
-#include <asm/msr-index.h>
-
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
diff --git a/tools/power/x86/turbostat/Makefile b/tools/power/x86/turbostat/Makefile
index 4039854560d0..e367b1a85d70 100644
--- a/tools/power/x86/turbostat/Makefile
+++ b/tools/power/x86/turbostat/Makefile
@@ -9,7 +9,7 @@ endif
 
 turbostat : turbostat.c
 CFLAGS +=	-Wall
-CFLAGS +=	-DMSRHEADER='"../../../../arch/x86/include/uapi/asm/msr-index.h"'
+CFLAGS +=	-DMSRHEADER='"../../../../arch/x86/include/asm/msr-index.h"'
 
 %: %.c
 	@mkdir -p $(BUILD_OUTPUT)
-- 
2.3.5

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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