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[MIPS] Enable support for the userlocal hardware register

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Which will cut down the cost of RDHWR $29 which is used to obtain the
TLS pointer and so far being emulated in software down to a single cycle
operation.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2007-07-10 17:33:02 +01:00
parent d223a86154
commit a36920200c
7 changed files with 24 additions and 5 deletions
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5
arch/mips/kernel/syscall.c
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@ -272,9 +272,8 @@ asmlinkage int sys_set_thread_area(unsigned long addr)
struct thread_info *ti = task_thread_info(current);
ti->tp_value = addr;
/* If some future MIPS implementation has this register in hardware,
* we will need to update it here (and in context switches). */
if (cpu_has_userlocal)
write_c0_userlocal(addr);
return 0;
}