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ARC: pt_regs update #1: Align pt_regs end with end of kernel stack page

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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>
This commit is contained in:
Vineet Gupta 2013-05-28 09:34:45 +05:30
parent bed30976e7
commit 283237a04f
4 changed files with 3 additions and 5 deletions
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2
arch/arc/kernel/process.c
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@ -75,8 +75,6 @@ asmlinkage void ret_from_fork(void);
* ~ ~
* | --to-- | (scratch Regs of user mode)
* | r0 |
* ------------------
* | UNUSED 1 word|
* ------------------ <===== END of PAGE
*/
int copy_thread(unsigned long clone_flags,