x86/asm/entry/64: Remove thread_struct::usersp

Nothing uses thread_struct::usersp anymore, so remove it.

Originally-from: Denys Vlasenko <dvlasenk@redhat.com>
Tested-by: Borislav Petkov <bp@alien8.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 3ac5092..5720997 100644 (file)
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -493,7 +493,6 @@ struct thread_struct {
 #ifdef CONFIG_X86_32
        unsigned long           sysenter_cs;
 #else
-       unsigned long           usersp; /* Copy from PDA */
        unsigned short          es;
        unsigned short          ds;
        unsigned short          fsindex;

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 59696d7..14df2be 100644 (file)
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -161,7 +161,6 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
        p->thread.sp0 = (unsigned long)task_stack_page(p) + THREAD_SIZE;
        childregs = task_pt_regs(p);
        p->thread.sp = (unsigned long) childregs;
-       p->thread.usersp = me->thread.usersp;
        set_tsk_thread_flag(p, TIF_FORK);
        p->thread.io_bitmap_ptr = NULL;
 
@@ -235,7 +234,6 @@ start_thread_common(struct pt_regs *regs, unsigned long new_ip,
        loadsegment(es, _ds);
        loadsegment(ds, _ds);
        load_gs_index(0);
-       current->thread.usersp  = new_sp;
        regs->ip                = new_ip;
        regs->sp                = new_sp;
        regs->cs                = _cs;
@@ -397,7 +395,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
        /*
         * Switch the PDA and FPU contexts.
         */
-       prev->usersp = this_cpu_read(old_rsp);
        this_cpu_write(current_task, next_p);
 
        /*