[SPARC]: Get sun4c functional again in 2.6.0

Move some elements of task_struct into thread_info so that
these elements are locked into the TLB in the trap handlers
and thus will not cause a watchdog reset.

arch/sparc/kernel/asm-offsets.c

@@ -38,12 +38,6 @@ int foo(void)
 	DEFINE(AOFF_thread_fork_kpsr,
 			offsetof(struct thread_struct, fork_kpsr));
 	BLANK();
-	DEFINE(AOFF_thread_w_saved, offsetof(struct thread_struct, w_saved));
-	DEFINE(AOFF_thread_rwbuf_stkptrs,
-			offsetof(struct thread_struct, rwbuf_stkptrs));
-	DEFINE(AOFF_thread_reg_window,
-			offsetof(struct thread_struct, reg_window));
-	BLANK();
 	DEFINE(AOFF_mm_context, offsetof(struct mm_struct, context));
 
 	/* DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28); */

arch/sparc/kernel/entry.S

@@ -1907,9 +1907,8 @@ kuw_patch1:
 	wr	%o5, 0x0, %psr			! re-enable interrupts
 	WRITE_PAUSE				! burn baby burn
 3:
-	ld	[%g6 + TI_TASK], %o4
 	retl					! return
-	 st	%g0, [%o4 + AOFF_task_thread + AOFF_thread_w_saved]	! no windows saved
+	 st	%g0, [%g6 + TI_W_SAVED]		! no windows saved
 
 	.align	4
 	.globl	C_LABEL(restore_current)

arch/sparc/kernel/etrap.S

@@ -12,7 +12,6 @@
 #include <asm/page.h>
 #include <asm/psr.h>
 #include <asm/ptrace.h>
-#include <asm/asm_offsets.h>
 #include <asm/winmacro.h>
 #include <asm/asmmacro.h>
 #include <asm/thread_info.h>
@@ -57,7 +56,7 @@ tsetup_7win_patch6:	and	%g2, 0x7f, %g2
 	 *
 	 * sethi	%hi(trap_setup), %l4
 	 * jmpl		%l4 + %lo(trap_setup), %l6
-	 * mov		1, %l4
+	 * nop
 	 */
 
 	/* 2 3 4  window number
@@ -156,9 +155,8 @@ trap_setup_from_user:
 	and	%t_kstack, %curptr, %curptr
 #endif
 
-	/* Clear current->thread.w_saved */
-	ld	[%curptr + TI_TASK], %g2
-	st	%g0, [%g2 + AOFF_task_thread + AOFF_thread_w_saved]
+	/* Clear current_thread_info->w_saved */
+	st	%g0, [%curptr + TI_W_SAVED]
 
 	/* See if we are in the trap window. */
 	andcc	%t_twinmask, %t_wim, %g0
@@ -292,8 +290,7 @@ trap_setup_user_stack_is_bolixed:
 	/* From user/kernel into invalid window w/bad user
 	 * stack. Save bad user stack, and return to caller.
 	 */
-	ld	[%curptr + TI_TASK], %glob_tmp
-	SAVE_BOLIXED_USER_STACK(glob_tmp, g3)
+	SAVE_BOLIXED_USER_STACK(curptr, g3)
 	restore	%g0, %g0, %g0
 
 	jmpl	%t_retpc + 0x8, %g0

arch/sparc/kernel/process.c

@@ -356,7 +356,7 @@ void exit_thread(void)
 
 void flush_thread(void)
 {
-	current->thread.w_saved = 0;
+	current_thread_info()->w_saved = 0;
 
 	/* No new signal delivery by default */
 	current->thread.new_signal = 0;
@@ -490,9 +490,6 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
 	ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
 	ti->kwim = current->thread.fork_kwim;
 
-	/* This is used for sun4c only */
-	atomic_set(&p->thread.refcount, 1);
-
 	if(regs->psr & PSR_PS) {
 		extern struct pt_regs fake_swapper_regs;
 

arch/sparc/kernel/ptrace.c

@@ -72,7 +72,7 @@ static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
 				   struct task_struct *tsk, long *addr)
 {
 	struct pt_regs *cregs = tsk->thread.kregs;
-	struct thread_struct *t = &tsk->thread;
+	struct thread_info *t = tsk->thread_info;
 	int v;
 	
 	if(offset >= 1024)
@@ -93,16 +93,16 @@ static inline void read_sunos_user(struct pt_regs *regs, unsigned long offset,
 	}
 	switch(offset) {
 	case 0:
-		v = tsk->thread_info->ksp;
+		v = t->ksp;
 		break;
 	case 4:
-		v = tsk->thread_info->kpc;
+		v = t->kpc;
 		break;
 	case 8:
-		v = tsk->thread_info->kpsr;
+		v = t->kpsr;
 		break;
 	case 12:
-		v = tsk->thread_info->uwinmask;
+		v = t->uwinmask;
 		break;
 	case 832:
 		v = t->w_saved;
@@ -167,7 +167,7 @@ static inline void write_sunos_user(struct pt_regs *regs, unsigned long offset,
 				    struct task_struct *tsk)
 {
 	struct pt_regs *cregs = tsk->thread.kregs;
-	struct thread_struct *t = &tsk->thread;
+	struct thread_info *t = tsk->thread_info;
 	unsigned long value = regs->u_regs[UREG_I3];
 
 	if(offset >= 1024)

arch/sparc/kernel/rtrap.S

@@ -7,7 +7,6 @@
 #include <asm/cprefix.h>
 #include <asm/page.h>
 #include <asm/ptrace.h>
-#include <asm/asm_offsets.h>
 #include <asm/psr.h>
 #include <asm/asi.h>
 #include <asm/smp.h>
@@ -87,8 +86,7 @@ ret_trap_continue:
 	wr	%t_psr, 0x0, %psr
 	WRITE_PAUSE
 
-	ld	[%curptr + TI_TASK], %o5
-	ld	[%o5 + AOFF_task_thread + AOFF_thread_w_saved], %twin_tmp1
+	ld	[%curptr + TI_W_SAVED], %twin_tmp1
 	orcc	%g0, %twin_tmp1, %g0
 	be	ret_trap_nobufwins
 	 nop

arch/sparc/kernel/signal.c

@@ -432,6 +432,7 @@ setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *old
 	int window = 0, err;
 	unsigned long pc = regs->pc;
 	unsigned long npc = regs->npc;
+	struct thread_info *tp = current_thread_info();
 	void *sig_address;
 	int sig_code;
 
@@ -459,20 +460,20 @@ setup_frame(struct sigaction *sa, struct pt_regs *regs, int signr, sigset_t *old
 	err |= __put_user(regs->psr, &sc->sigc_psr);
 	err |= __put_user(regs->u_regs[UREG_G1], &sc->sigc_g1);
 	err |= __put_user(regs->u_regs[UREG_I0], &sc->sigc_o0);
-	err |= __put_user(current->thread.w_saved, &sc->sigc_oswins);
-	if (current->thread.w_saved)
-		for (window = 0; window < current->thread.w_saved; window++) {
-			put_user((char *)current->thread.rwbuf_stkptrs[window],
+	err |= __put_user(tp->w_saved, &sc->sigc_oswins);
+	if (tp->w_saved)
+		for (window = 0; window < tp->w_saved; window++) {
+			put_user((char *)tp->rwbuf_stkptrs[window],
 				 &sc->sigc_spbuf[window]);
 			err |= __copy_to_user(&sc->sigc_wbuf[window],
-					      &current->thread.reg_window[window],
+					      &tp->reg_window[window],
 					      sizeof(struct reg_window));
 		}
 	else
 		err |= __copy_to_user(sframep, (char *) regs->u_regs[UREG_FP],
 				      sizeof(struct reg_window));
 
-	current->thread.w_saved = 0; /* So process is allowed to execute. */
+	tp->w_saved = 0; /* So process is allowed to execute. */
 
 	err |= __put_user(signr, &sframep->sig_num);
 	sig_address = NULL;
@@ -601,7 +602,7 @@ new_setup_frame(struct k_sigaction *ka, struct pt_regs *regs,
 	if (invalid_frame_pointer(sf, sigframe_size))
 		goto sigill_and_return;
 
-	if (current->thread.w_saved != 0)
+	if (current_thread_info()->w_saved != 0)
 		goto sigill_and_return;
 
 	/* 2. Save the current process state */
@@ -675,7 +676,7 @@ new_setup_rt_frame(struct k_sigaction *ka, struct pt_regs *regs,
 		get_sigframe(&ka->sa, regs, sigframe_size);
 	if (invalid_frame_pointer(sf, sigframe_size))
 		goto sigill;
-	if (current->thread.w_saved != 0)
+	if (current_thread_info()->w_saved != 0)
 		goto sigill;
 
 	err  = __put_user(regs->pc, &sf->regs.pc);
@@ -752,6 +753,7 @@ setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
 	svr4_gwindows_t __user *gw;
 	svr4_ucontext_t __user *uc;
 	svr4_sigset_t	setv;
+	struct thread_info *tp = current_thread_info();
 	int window = 0, err;
 
 	synchronize_user_stack();
@@ -808,7 +810,7 @@ setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
 	err |= __put_user(gw, &mc->gwin);
 	    
 	/* 2. Number of windows to restore at setcontext(): */
-	err |= __put_user(current->thread.w_saved, &gw->count);
+	err |= __put_user(tp->w_saved, &gw->count);
 
 	/* 3. Save each valid window
 	 *    Currently, it makes a copy of the windows from the kernel copy.
@@ -821,16 +823,16 @@ setup_svr4_frame(struct sigaction *sa, unsigned long pc, unsigned long npc,
 	 *    These windows are just used in case synchronize_user_stack failed
 	 *    to flush the user windows.
 	 */
-	for (window = 0; window < current->thread.w_saved; window++) {
+	for (window = 0; window < tp->w_saved; window++) {
 		err |= __put_user((int *) &(gw->win[window]), &gw->winptr[window]);
 		err |= __copy_to_user(&gw->win[window],
-				      &current->thread.reg_window[window],
+				      &tp->reg_window[window],
 				      sizeof(svr4_rwindow_t));
 		err |= __put_user(0, gw->winptr[window]);
 	}
 
 	/* 4. We just pay attention to the gw->count field on setcontext */
-	current->thread.w_saved = 0; /* So process is allowed to execute. */
+	tp->w_saved = 0; /* So process is allowed to execute. */
 
 	/* Setup the signal information.  Solaris expects a bunch of
 	 * information to be passed to the signal handler, we don't provide
@@ -878,7 +880,7 @@ asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
 
 	synchronize_user_stack();
 
-	if (current->thread.w_saved)
+	if (current_thread_info()->w_saved)
 		goto sigsegv_and_return;
 
 	err = clear_user(uc, sizeof(*uc));
@@ -928,7 +930,6 @@ asmlinkage int svr4_getcontext(svr4_ucontext_t __user *uc, struct pt_regs *regs)
 /* Set the context for a svr4 application, this is Solaris way to sigreturn */
 asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
 {
-	struct thread_struct *tp = &current->thread;
 	svr4_gregset_t  __user *gr;
 	unsigned long pc, npc, psr;
 	sigset_t set;
@@ -941,7 +942,7 @@ asmlinkage int svr4_setcontext(svr4_ucontext_t __user *c, struct pt_regs *regs)
 	 */
 	flush_user_windows();
 
-	if (tp->w_saved)
+	if (current_thread_info()->w_saved)
 		goto sigsegv_and_return;
 
 	if (((uint) c) & 3)

arch/sparc/kernel/traps.c

@@ -497,7 +497,10 @@ void trap_init(void)
 	    TI_KSP         != offsetof(struct thread_info, ksp) ||
 	    TI_KPC         != offsetof(struct thread_info, kpc) ||
 	    TI_KPSR        != offsetof(struct thread_info, kpsr) ||
-	    TI_KWIM        != offsetof(struct thread_info, kwim))
+	    TI_KWIM        != offsetof(struct thread_info, kwim) ||
+	    TI_REG_WINDOW  != offsetof(struct thread_info, reg_window) ||
+	    TI_RWIN_SPTRS  != offsetof(struct thread_info, rwbuf_stkptrs) ||
+	    TI_W_SAVED     != offsetof(struct thread_info, w_saved))
 		thread_info_offsets_are_bolixed_pete();
 
 	/* Attach to the address space of init_task. */

arch/sparc/kernel/windows.c

@@ -36,7 +36,7 @@ void flush_user_windows(void)
 	: "g4", "cc");
 }
 
-static inline void shift_window_buffer(int first_win, int last_win, struct thread_struct *tp)
+static inline void shift_window_buffer(int first_win, int last_win, struct thread_info *tp)
 {
 	int i;
 
@@ -57,11 +57,10 @@ static inline void shift_window_buffer(int first_win, int last_win, struct threa
  */
 void synchronize_user_stack(void)
 {
-	struct thread_struct *tp;
+	struct thread_info *tp = current_thread_info();
 	int window;
 
 	flush_user_windows();
-	tp = &current->thread;
 	if(!tp->w_saved)
 		return;
 
@@ -110,12 +109,11 @@ static inline void copy_aligned_window(void *dest, const void *src)
 
 void try_to_clear_window_buffer(struct pt_regs *regs, int who)
 {
-	struct thread_struct *tp;
+	struct thread_info *tp = current_thread_info();
 	int window;
 
 	lock_kernel();
 	flush_user_windows();
-	tp = &current->thread;
 	for(window = 0; window < tp->w_saved; window++) {
 		unsigned long sp = tp->rwbuf_stkptrs[window];
 

arch/sparc/kernel/wof.S

@@ -8,7 +8,6 @@
 #include <asm/contregs.h>
 #include <asm/page.h>
 #include <asm/ptrace.h>
-#include <asm/asm_offsets.h>
 #include <asm/psr.h>
 #include <asm/smp.h>
 #include <asm/asi.h>
@@ -211,20 +210,18 @@ spwin_user_stack_is_bolixed:
 	bne	spwin_bad_ustack_from_kernel
 	 nop
 
-	ld	[%curptr + TI_TASK], %glob_tmp
-
 	/* Oh well, throw this one window into the per-task window
 	 * buffer, the first one.
 	 */
-	st	%sp, [%glob_tmp + AOFF_task_thread + AOFF_thread_rwbuf_stkptrs]
-	STORE_WINDOW(glob_tmp + AOFF_task_thread + AOFF_thread_reg_window)
+	st	%sp, [%curptr + TI_RWIN_SPTRS]
+	STORE_WINDOW(curptr + TI_REG_WINDOW)
 	restore	%g0, %g0, %g0
 
 	/* LOCATION: Trap Window */
 
 	/* Back in the trap window, update winbuffer save count. */
 	mov	1, %twin_tmp
-	st	%twin_tmp, [%glob_tmp + AOFF_task_thread + AOFF_thread_w_saved]
+	st	%twin_tmp, [%curptr + TI_W_SAVED]
 
 		/* Compute new user window mask.  What we are basically
 		 * doing is taking two windows, the invalid one at trap
@@ -275,8 +272,7 @@ spwin_bad_ustack_from_kernel:
 	 * a per-process window buffer until we can properly handle
 	 * this later on.
 	 */
-	ld	[%curptr + TI_TASK], %glob_tmp	/* Using curptr one last time */
-	SAVE_BOLIXED_USER_STACK(glob_tmp, g6)	/* ...now using g6 as scratch */
+	SAVE_BOLIXED_USER_STACK(curptr, glob_tmp)
 	restore	%g0, %g0, %g0
 
 	/* LOCATION: Trap window */

arch/sparc/kernel/wuf.S

@@ -8,7 +8,6 @@
 #include <asm/contregs.h>
 #include <asm/page.h>
 #include <asm/ptrace.h>
-#include <asm/asm_offsets.h>
 #include <asm/psr.h>
 #include <asm/smp.h>
 #include <asm/asi.h>
@@ -187,8 +186,7 @@ fwin_user_stack_is_bolixed:
 	mov	0x1, %g5
 	sll	%g5, %g3, %g5
 	st	%g5, [%curptr + TI_UWINMASK]		! one live user window still
-	ld	[%curptr + TI_TASK], %g5
-	st	%g0, [%g5 + AOFF_task_thread + AOFF_thread_w_saved]		! no windows in the buffer
+	st	%g0, [%curptr + TI_W_SAVED]		! no windows in the buffer
 
 	wr	%t_psr, PSR_ET, %psr			! enable traps
 	nop

arch/sparc/mm/fault.c

@@ -550,7 +550,7 @@ void window_overflow_fault(void)
 {
 	unsigned long sp;
 
-	sp = current->thread.rwbuf_stkptrs[0];
+	sp = current_thread_info()->rwbuf_stkptrs[0];
 	if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK))
 		force_user_fault(sp + 0x38, 1);
 	force_user_fault(sp, 1);

arch/sparc/mm/init.c

@@ -209,7 +209,8 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
 	if (max_low_pfn > (SRMMU_MAXMEM >> PAGE_SHIFT)) {
 		highstart_pfn = (SRMMU_MAXMEM >> PAGE_SHIFT);
 		max_low_pfn = calc_max_low_pfn();
-		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", calc_highpages());
+		printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+		    calc_highpages() >> (20 - PAGE_SHIFT));
 	}
 
 #ifdef CONFIG_BLK_DEV_INITRD

arch/sparc/mm/sun4c.c

@@ -1067,7 +1067,6 @@ static void sun4c_free_thread_info(struct thread_info *ti)
 	unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
 	int entry = BUCKET_NUM(tiaddr);
 
-	if (atomic_dec_and_test(&ti->task->thread.refcount)) {
 	/* We are deleting a mapping, so the flush here is mandatory. */
 	sun4c_flush_page(tiaddr);
 #ifndef CONFIG_SUN4	
@@ -1083,7 +1082,6 @@ static void sun4c_free_thread_info(struct thread_info *ti)
 
 	free_pages(pages, THREAD_INFO_ORDER);
 	garbage_collect(entry);
-	}
 }
 
 static void __init sun4c_init_buckets(void)

include/asm-sparc/processor.h

@@ -56,19 +56,12 @@ typedef struct {
 /* The Sparc processor specific thread struct. */
 struct thread_struct {
 	struct pt_regs *kregs;
+	unsigned int _pad1;
 
 	/* Special child fork kpsr/kwim values. */
 	unsigned long fork_kpsr __attribute__ ((aligned (8)));
 	unsigned long fork_kwim;
 
-	/* A place to store user windows and stack pointers
-	 * when the stack needs inspection.
-	 */
-#define NSWINS 8
-	struct reg_window reg_window[NSWINS] __attribute__ ((aligned (8)));
-	unsigned long rwbuf_stkptrs[NSWINS] __attribute__ ((aligned (8)));
-	unsigned long w_saved;
-
 	/* Floating point regs */
 	unsigned long   float_regs[32] __attribute__ ((aligned (8)));
 	unsigned long   fsr;
@@ -78,23 +71,16 @@ struct thread_struct {
 	mm_segment_t current_ds;
 	struct exec core_exec;     /* just what it says. */
 	int new_signal;
-	atomic_t refcount;	/* used for sun4c only */
 };
 
 #define SPARC_FLAG_KTHREAD      0x1    /* task is a kernel thread */
 #define SPARC_FLAG_UNALIGNED    0x2    /* is allowed to do unaligned accesses */
 
 #define INIT_THREAD  { \
-/* kregs, */ \
-   0,  \
+/* kregs, _pad1, */ \
+   0, 0,  \
 /* fork_kpsr, fork_kwim */ \
    0,         0, \
-/* reg_window */  \
-{ { { 0, }, { 0, } }, }, \
-/* rwbuf_stkptrs */  \
-{ 0, 0, 0, 0, 0, 0, 0, 0, }, \
-/* w_saved */ \
-   0, \
 /* FPU regs */   { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
                    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, }, \
 /* FPU status, FPU qdepth, FPU queue */ \

include/asm-sparc/thread_info.h

@@ -16,16 +16,14 @@
 #ifndef __ASSEMBLY__
 
 #include <asm/btfixup.h>
+#include <asm/ptrace.h>
 
 /*
  * Low level task data.
  *
- * If you change this, change the TI_* offsets below to match. XXX check_asm.
- *
- * The uwinmask is a first class citizen among w_saved and friends.
- * XXX Is this a good idea? wof.S/wuf.S have to use w_saved anyway,
- *     so they waste a register on current, and an ld on fetching it.
+ * If you change this, change the TI_* offsets below to match.
  */
+#define NSWINS 8
 struct thread_info {
 	unsigned long		uwinmask;
 	struct task_struct	*task;		/* main task structure */
@@ -43,6 +41,13 @@ struct thread_info {
 	unsigned long kpsr;
 	unsigned long kwim;
 
+	/* A place to store user windows and stack pointers
+	 * when the stack needs inspection.
+	 */
+	struct reg_window	reg_window[NSWINS];	/* align for ldd! */
+	unsigned long		rwbuf_stkptrs[NSWINS];
+	unsigned long		w_saved;
+
 	struct restart_block	restart_block;
 };
 
@@ -100,6 +105,7 @@ BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
 
 /*
  * Offsets in thread_info structure, used in assembly code
+ * The "#define REGWIN_SZ 0x40" was abolished, so no multiplications.
  */
 #define TI_UWINMASK	0x00	/* uwinmask */
 #define TI_TASK		0x04
@@ -113,7 +119,10 @@ BTFIXUPDEF_CALL(void, free_thread_info, struct thread_info *)
 #define TI_KPC		0x24	/* kpc (ldd'ed with kpc) */
 #define TI_KPSR		0x28	/* kpsr */
 #define TI_KWIM		0x2c	/* kwim (ldd'ed with kpsr) */
-#define TI_RESTART_BLOCK 0x30
+#define TI_REG_WINDOW	0x30
+#define TI_RWIN_SPTRS	0x230
+#define TI_W_SAVED	0x250
+/* #define TI_RESTART_BLOCK 0x25n */ /* Nobody cares */
 
 #define PREEMPT_ACTIVE		0x4000000
 

include/asm-sparc/winmacro.h

@@ -9,7 +9,6 @@
 
 #include <linux/config.h>
 #include <asm/ptrace.h>
-#include <asm/psr.h>
 
 /* Store the register window onto the 8-byte aligned area starting
  * at %reg.  It might be %sp, it might not, we don't care.
@@ -91,18 +90,18 @@
         STORE_PT_INS(base_reg)
 
 #define SAVE_BOLIXED_USER_STACK(cur_reg, scratch) \
-        ld       [%cur_reg + AOFF_task_thread + AOFF_thread_w_saved], %scratch; \
+        ld       [%cur_reg + TI_W_SAVED], %scratch; \
         sll      %scratch, 2, %scratch; \
         add      %scratch, %cur_reg, %scratch; \
-        st       %sp, [%scratch + AOFF_task_thread + AOFF_thread_rwbuf_stkptrs]; \
+        st       %sp, [%scratch + TI_RWIN_SPTRS]; \
         sub      %scratch, %cur_reg, %scratch; \
         sll      %scratch, 4, %scratch; \
         add      %scratch, %cur_reg, %scratch; \
-        STORE_WINDOW(scratch + AOFF_task_thread + AOFF_thread_reg_window); \
+        STORE_WINDOW(scratch + TI_REG_WINDOW); \
         sub      %scratch, %cur_reg, %scratch; \
         srl      %scratch, 6, %scratch; \
         add      %scratch, 1, %scratch; \
-        st       %scratch, [%cur_reg + AOFF_task_thread + AOFF_thread_w_saved];
+        st       %scratch, [%cur_reg + TI_W_SAVED];
 
 #ifdef CONFIG_SMP
 #define LOAD_CURRENT4M(dest_reg, idreg) \