Blackfin arch: disable pthread stack check for SMP at runtime
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
diff --git a/arch/blackfin/include/asm/l1layout.h b/arch/blackfin/include/asm/l1layout.h
index 06bb37f..79dbefaa 100644
--- a/arch/blackfin/include/asm/l1layout.h
+++ b/arch/blackfin/include/asm/l1layout.h
@@ -8,6 +8,7 @@
#include <asm/blackfin.h>
+#ifndef CONFIG_SMP
#ifndef __ASSEMBLY__
/* Data that is "mapped" into the process VM at the start of the L1 scratch
@@ -28,5 +29,6 @@
get_l1_scratch_start())
#endif
+#endif
#endif
diff --git a/arch/blackfin/include/asm/processor.h b/arch/blackfin/include/asm/processor.h
index 83d57a8..0eece23 100644
--- a/arch/blackfin/include/asm/processor.h
+++ b/arch/blackfin/include/asm/processor.h
@@ -65,6 +65,7 @@
* pass the data segment into user programs if it exists,
* it can't hurt anything as far as I can tell
*/
+#ifndef CONFIG_SMP
#define start_thread(_regs, _pc, _usp) \
do { \
set_fs(USER_DS); \
@@ -78,6 +79,16 @@
sizeof(*L1_SCRATCH_TASK_INFO)); \
wrusp(_usp); \
} while(0)
+#else
+#define start_thread(_regs, _pc, _usp) \
+do { \
+ set_fs(USER_DS); \
+ (_regs)->pc = (_pc); \
+ if (current->mm) \
+ (_regs)->p5 = current->mm->start_data; \
+ wrusp(_usp); \
+} while (0)
+#endif
/* Forward declaration, a strange C thing */
struct task_struct;
diff --git a/arch/blackfin/include/asm/system.h b/arch/blackfin/include/asm/system.h
index aa7d87b..812e6e6 100644
--- a/arch/blackfin/include/asm/system.h
+++ b/arch/blackfin/include/asm/system.h
@@ -197,6 +197,7 @@
asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next);
+#ifndef CONFIG_SMP
#define switch_to(prev,next,last) \
do { \
memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \
@@ -205,5 +206,11 @@
sizeof *L1_SCRATCH_TASK_INFO); \
(last) = resume (prev, next); \
} while (0)
+#else
+#define switch_to(prev, next, last) \
+do { \
+ (last) = resume(prev, next); \
+} while (0)
+#endif
#endif /* _BLACKFIN_SYSTEM_H */
diff --git a/arch/blackfin/include/asm/thread_info.h b/arch/blackfin/include/asm/thread_info.h
index 7eaf2e2..e721ce5 100644
--- a/arch/blackfin/include/asm/thread_info.h
+++ b/arch/blackfin/include/asm/thread_info.h
@@ -63,7 +63,9 @@
int preempt_count; /* 0 => preemptable, <0 => BUG */
mm_segment_t addr_limit; /* address limit */
struct restart_block restart_block;
+#ifndef CONFIG_SMP
struct l1_scratch_task_info l1_task_info;
+#endif
};
/*