diff options
| author | Vineet Gupta <vgupta@synopsys.com> | 2013-05-28 09:34:45 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2013-06-22 19:23:21 +0530 |
| commit | 283237a04fd332bddc2ac298e6ad7d23a1fc4b99 (patch) | |
| tree | 227d6d2d2c2b167fb75df1835b466ed160a7994f /arch/arc/include/asm/entry.h | |
| parent | bed30976e7f1077c105306597ef05895234ba600 (diff) | |
ARC: pt_regs update #1: Align pt_regs end with end of kernel stack page
Historically, pt_regs would end at offset of 1 word from end of stack
page.
----------------- -> START of page (task->stack)
| |
| thread_info |
-----------------
| |
^ ~ ~
| ~ ~
| | |
| | | <---- pt_regs used to END here
-----------------
| 1 word GUTTER |
----------------- -> End of page (START of kernel stack)
This required special "one-off" considerations in low level code.
The root cause is very likely assumption of "empty" SP by the original
ARC kernel hackers, despite ARC700 always been "full" SP.
So finally RIP one word gutter !
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/asm/entry.h')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 5bbec8ad8123..2b274fa9c5a7 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -252,7 +252,7 @@ ld \out, [\tsk, TASK_THREAD_INFO] /* Go to end of page where stack begins (grows upwards) */ - add2 \out, \out, (THREAD_SIZE - 4)/4 /* one word GUTTER */ + add2 \out, \out, (THREAD_SIZE)/4 .endm |