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

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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@gmail.com>
Cc: containers@lists.linux-foundation.org
LKML-Reference: <20090503233015.GJ16631@x200.localdomain>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexey Dobriyan 2009-05-04 03:30:15 +04:00 committed by Ingo Molnar
parent d756f4adb9
commit 0c23590f00
2 changed files with 3 additions and 1 deletions
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2
arch/x86/include/asm/processor.h
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@ -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

2
arch/x86/kernel/kgdb.c
View File

@ -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;