linux-kernel - Re: [PATCH] x86/mm: fix regression with huge pages on PAE

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Date:	Tue, 10 Nov 2015 15:46:48 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com,
	konrad.wilk@...cle.com, elliott@....com,
	boris.ostrovsky@...cle.com, Toshi Kani <toshi.kani@....com>
Subject: Re: [PATCH] x86/mm: fix regression with huge pages on PAE

On Tue, Nov 10, 2015 at 03:53:03PM +0200, Kirill A. Shutemov wrote:
> Oh.. pmdval_t/pudval_t is 'unsinged long' on 64 bit. But realmode code
> uses -m16 which makes 'unsigned long' 32-bit therefore truncation warning.
> 
> These helpers not really used in realmode code.

Hrrm, yeah, that's just the nasty include hell causing it. The diff
below fixes it with my config but it'll probably need a more careful
analysis and reshuffling of includes/defines.

Certainly better to do that than accomodating realmode to not throw
warnings with ifdeffery...

---
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index 0033e96c3f09..9011a88353de 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -23,7 +23,6 @@
 #include <stdarg.h>
 #include <linux/types.h>
 #include <linux/edd.h>
-#include <asm/boot.h>
 #include <asm/setup.h>
 #include "bitops.h"
 #include "ctype.h"
diff --git a/arch/x86/boot/video-mode.c b/arch/x86/boot/video-mode.c
index aa8a96b052e3..896077ed3381 100644
--- a/arch/x86/boot/video-mode.c
+++ b/arch/x86/boot/video-mode.c
@@ -19,6 +19,9 @@
 #include "video.h"
 #include "vesa.h"
 
+#define NORMAL_VGA	0xffff		/* 80x25 mode */
+#define EXTENDED_VGA	0xfffe		/* 80x50 mode */
+
 /*
  * Common variables
  */
diff --git a/arch/x86/boot/video.c b/arch/x86/boot/video.c
index 05111bb8d018..a839448038b6 100644
--- a/arch/x86/boot/video.c
+++ b/arch/x86/boot/video.c
@@ -17,6 +17,8 @@
 #include "video.h"
 #include "vesa.h"
 
+#define ASK_VGA		0xfffd		/* ask for it at bootup */
+
 static u16 video_segment;
 
 static void store_cursor_position(void)
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 48d34d28f5a6..cd0fc0cc78bc 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -1,7 +1,6 @@
 #ifndef _ASM_X86_PLATFORM_H
 #define _ASM_X86_PLATFORM_H
 
-#include <asm/pgtable_types.h>
 #include <asm/bootparam.h>
 
 struct mpc_bus;

-- 
Regards/Gruss,
    Boris.

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