Re: [patch] x86: optimise page fault entry

[Johannes Weiner <hannes@cmpxchg.org>]

Nick, here is the patch.  Ingo could you fold that one into Nick's as
a micro-mini minor fix?

On Tue, Jan 20, 2009 at 04:24:26AM +0100, Nick Piggin wrote:

> Index: linux-2.6/arch/x86/mm/fault.c
> ===================================================================
> --- linux-2.6.orig/arch/x86/mm/fault.c
> +++ linux-2.6/arch/x86/mm/fault.c

> @@ -409,15 +409,15 @@ static void show_fault_oops(struct pt_re
>  }
>  
>  #ifdef CONFIG_X86_64
> -static noinline void pgtable_bad(unsigned long address, struct pt_regs *regs,
> -				 unsigned long error_code)
> +static noinline void pgtable_bad(struct pt_regs *regs,
> +			 unsigned long error_code, unsigned long address)
>  {
>  	unsigned long flags = oops_begin();
>  	int sig = SIGKILL;
> -	struct task_struct *tsk;
> +	struct task_struct *tsk = current;
>  
>  	printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
> -	       current->comm, address);
> +	       tsk->comm, address);
>  	dump_pagetable(address);
>  	tsk = current;

---
tsk is already assigned to current, drop the redundant second
assignment which Nick probably just overlooked when doing the cleanup.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 arch/x86/mm/fault.c |    1 -
 1 file changed, 1 deletion(-)

--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -419,7 +419,6 @@ static noinline void pgtable_bad(struct 
 	printk(KERN_ALERT "%s: Corrupted page table at address %lx\n",
 	       tsk->comm, address);
 	dump_pagetable(address);
-	tsk = current;
 	tsk->thread.cr2 = address;
 	tsk->thread.trap_no = 14;
 	tsk->thread.error_code = error_code;