x86, 64-bit: ifdef out struct thread_struct::ip (0c23590f) · Commits · 戴 / test

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>

arch/x86/include/asm/processor.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -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

arch/x86/kernel/kgdb.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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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