Re: [PATCH v2] x86: page: get_order() optimization

[H. Peter Anvin]

On 03/28/2011 12:33 PM, Maksym Planeta wrote:
> 
> Here is disassembly of patched get_order() with "inline" from
> "kernel/kexec.c":
> 
>      a6c:       48 8b 5d c8             mov    -0x38(%rbp),%rbx
>      a70:       e8 0b fd ff ff          callq  780 <get_order.clone.7>
> 
> 0000000000000780 <get_order.clone.7>:
>      780:       55                      push   %rbp
>      781:       b8 01 00 00 00          mov    $0x1,%eax
>      786:       48 89 e5                mov    %rsp,%rbp
>      789:       c9                      leaveq 
>      78a:       c3                      retq   
> 
> My version of gcc is gcc (Debian 4.5.2-4) 4.5.2, probably I should
> upgrade my gcc version for better inline expansions.
> 

With what options?

	-hpa
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