@@ -126,19 +126,11 @@
* to be saved again on kernel mode stack, as part of pt_regs.
*-------------------------------------------------------------*/
.macro PROLOG_FREEUP_REG reg, mem
-#ifndef ARC_USE_SCRATCH_REG
- sr \reg, [ARC_REG_SCRATCH_DATA0]
-#else
st \reg, [\mem]
-#endif
.endm
.macro PROLOG_RESTORE_REG reg, mem
-#ifndef ARC_USE_SCRATCH_REG
- lr \reg, [ARC_REG_SCRATCH_DATA0]
-#else
ld \reg, [\mem]
-#endif
.endm
/*--------------------------------------------------------------
@@ -31,10 +31,6 @@
#define ARC_REG_SCRATCH_DATA0 0x46c
#endif
-#if defined(CONFIG_ISA_ARCV2) || !defined(CONFIG_SMP)
-#define ARC_USE_SCRATCH_REG
-#endif
-
/* Bits in MMU PID register */
#define __TLB_ENABLE (1 << 31)
#define __PROG_ENABLE (1 << 30)
@@ -146,7 +146,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
*/
cpumask_set_cpu(cpu, mm_cpumask(next));
-#ifdef ARC_USE_SCRATCH_REG
+#ifdef CONFIG_ISA_ARCV2
/* PGD cached in MMU reg to avoid 3 mem lookups: task->mm->pgd */
write_aux_reg(ARC_REG_SCRATCH_DATA0, next->pgd);
#endif
@@ -719,8 +719,8 @@ void arc_mmu_init(void)
/* Enable the MMU */
write_aux_reg(ARC_REG_PID, MMU_ENABLE);
- /* In smp we use this reg for interrupt 1 scratch */
-#ifdef ARC_USE_SCRATCH_REG
+ /* In arc700/smp needed for re-entrant interrupt handling */
+#ifdef CONFIG_ISA_ARCV2
/* swapper_pg_dir is the pgd for the kernel, used by vmalloc */
write_aux_reg(ARC_REG_SCRATCH_DATA0, swapper_pg_dir);
#endif
@@ -202,7 +202,7 @@ ex_saved_reg1:
lr r2, [efa]
-#ifdef ARC_USE_SCRATCH_REG
+#ifdef CONFIG_ISA_ARCV2
lr r1, [ARC_REG_SCRATCH_DATA0] ; current pgd
#else
GET_CURR_TASK_ON_CPU r1
ARC700 SMP uses MMU scratch reg for re-entrant interrupt handling (as opposed to the canonical usage for task pgd pointer caching for ARCv2 and ARC700 UP builds). However this requires fabricating a #define in a header which has usual issues of dependency nesting and ugliness. So clean this up and just use it as intended for ARCv2 only. For ARC700 just don't use it for mmu needs (even for UP which it potentially can (degrades it slightly) but that config it not a big deal in this day and age. Signed-off-by: Vineet Gupta <vgupta@kernel.org> --- arch/arc/include/asm/entry-compact.h | 8 -------- arch/arc/include/asm/mmu.h | 4 ---- arch/arc/include/asm/mmu_context.h | 2 +- arch/arc/mm/tlb.c | 4 ++-- arch/arc/mm/tlbex.S | 2 +- 5 files changed, 4 insertions(+), 16 deletions(-)