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Message-Id: <20070307113716.97558767.akpm@linux-foundation.org>
Date: Wed, 7 Mar 2007 11:37:16 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: "Miles Lane" <miles.lane@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
"Joerg Roedel" <joerg.roedel@....com>, "Andi Kleen" <ak@...e.de>
Subject: Re: 2.6.21-rc2-mm2 -- hot-fix
"revert-optimize-and-simplify-get_cycles_sync.patch" broke my build
On Wed, 7 Mar 2007 11:01:55 -0800 "Miles Lane" <miles.lane@...il.com> wrote:
> In file included from include/asm/timex.h:10,
> from include/linux/timex.h:187,
> from include/linux/sched.h:50,
> from include/linux/utsname.h:35,
> from include/asm/elf.h:12,
> from include/linux/elf.h:7,
> from include/linux/module.h:15,
> from include/linux/crypto.h:21,
> from arch/i386/kernel/asm-offsets.c:7:
> include/asm/tsc.h: In function 'get_cycles_sync':
> include/asm/tsc.h:45: warning: implicit declaration of function 'alternative_io'
> include/asm/tsc.h:46: error: called object '"=a"' is not a function
> include/asm/tsc.h:46: error: called object '"0"' is not a function
> include/asm/tsc.h:46: error: expected ')' before ':' token
> make[1]: *** [arch/i386/kernel/asm-offsets.s] Error 1
Yes, I ended up dropping another patch to fix that up and things got in a
mess.
Andy's patch should fix it up again
From: Andy Whitcroft <apw@...dowen.org>
Add an i386 implementation of alternative_io modelled on
the x86_64 version.
Signed-off-by: Andy Whitcroft <apw@...dowen.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
include/asm-i386/alternative.h | 17 +++++++++++++++++
include/asm-i386/tsc.h | 1 +
2 files changed, 18 insertions(+)
diff -puN include/asm-i386/alternative.h~i386-alternative_io-implementation include/asm-i386/alternative.h
--- a/include/asm-i386/alternative.h~i386-alternative_io-implementation
+++ a/include/asm-i386/alternative.h
@@ -100,6 +100,23 @@ static inline void alternatives_smp_swit
"663:\n\t" newinstr "\n664:\n" /* replacement */\
".previous" :: "i" (feature), ##input)
+#define alternative_io(oldinstr, newinstr, feature, output, input...) \
+ asm volatile ("661:\n\t" oldinstr "\n662:\n" \
+ ".section .altinstructions,\"a\"\n" \
+ " .align 4\n" \
+ " .long 661b\n" /* label */ \
+ " .long 663f\n" /* new instruction */ \
+ " .long 0x00\n" \
+ " .byte %c[feat]\n" /* feature bit */ \
+ " .byte 0x00\n" \
+ " .byte 662b-661b\n" /* sourcelen */ \
+ " .byte 664f-663f\n" /* replacementlen */ \
+ " .byte 0x00\n" \
+ ".previous\n" \
+ ".section .altinstr_replacement,\"ax\"\n" \
+ "663:\n\t" newinstr "\n664:\n" /* replacement */\
+ ".previous" : output : [feat] "i" (feature), ##input)
+
/* Like alternative_io, but supports 2 possible alternatives */
#define alternative_io_two(oldinstr, newinstr, feat, newinstr2, feat2,\
output, input...) \
diff -puN include/asm-i386/tsc.h~i386-alternative_io-implementation include/asm-i386/tsc.h
--- a/include/asm-i386/tsc.h~i386-alternative_io-implementation
+++ a/include/asm-i386/tsc.h
@@ -6,6 +6,7 @@
#ifndef _ASM_i386_TSC_H
#define _ASM_i386_TSC_H
+#include <asm/alternative.h>
#include <asm/processor.h>
/*
_
-
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