linux-kernel - [tip:x86/asm] x86, 64-bit: ifdef out struct thread

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Message-ID: <tip-0c23590f00f85467b318ad0c20c36796a5bd4c60@git.kernel.org>
Date:	Mon, 11 May 2009 15:09:40 GMT
From:	tip-bot for Alexey Dobriyan <adobriyan@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, mingo@...e.hu, adobriyan@...il.com
Subject: [tip:x86/asm] x86, 64-bit: ifdef out struct thread_struct::ip

Commit-ID:  0c23590f00f85467b318ad0c20c36796a5bd4c60
Gitweb:     http://git.kernel.org/tip/0c23590f00f85467b318ad0c20c36796a5bd4c60
Author:     Alexey Dobriyan <adobriyan@...il.com>
AuthorDate: Mon, 4 May 2009 03:30:15 +0400
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 11 May 2009 16:23:54 +0200

x86, 64-bit: ifdef out struct thread_struct::ip

struct thread_struct::ip isn't used on x86_64, struct pt_regs::ip is used
instead.

kgdb should be reading 0 always, but I can't check it.

[ Impact: (potentially) reduce thread_struct size on 64-bit ]

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
Cc: containers@...ts.linux-foundation.org
LKML-Reference: <20090503233015.GJ16631@...0.localdomain>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/include/asm/processor.h |    2 ++
 arch/x86/kernel/kgdb.c           |    2 +-
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index a6732ff..a9ba743 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -427,7 +427,9 @@ struct thread_struct {
 	unsigned short		fsindex;
 	unsigned short		gsindex;
 #endif
+#ifdef CONFIG_X86_32
 	unsigned long		ip;
+#endif
 #ifdef CONFIG_X86_64
 	unsigned long		fs;
 #endif
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index eedfaeb..d07706f 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -141,7 +141,7 @@ void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 	gdb_regs32[GDB_PS]	= *(unsigned long *)(p->thread.sp + 8);
 	gdb_regs32[GDB_CS]	= __KERNEL_CS;
 	gdb_regs32[GDB_SS]	= __KERNEL_DS;
-	gdb_regs[GDB_PC]	= p->thread.ip;
+	gdb_regs[GDB_PC]	= 0;
 	gdb_regs[GDB_R8]	= 0;
 	gdb_regs[GDB_R9]	= 0;
 	gdb_regs[GDB_R10]	= 0;
--
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