Re: [PATCH] i386/audit: stop scribbling on the stack frame

[H. Peter Anvin]

On 10/27/2014 06:55 AM, Eric Paris wrote:
> My patch was already committed to the -tip urgent branch.  I believe any
> optimization should be based on that branch, Richard.  If you are trying
> to wrangle every bit of speed out of this, should you
> 
> push %esi;
> push %edi;
> CFI_ADJUST_CFA_OFFSET 8
> call __audit_syscall_entry
> pop;
> pop;
> CFI_ADJUST_CFA_OFFSET -8
> 
> Instead of using the pushl_cfi and popl_cfi macros?
> 
> I wrote my patch to be obviously correct, but agree there are certainly
> some speedups possible.
> 

Uh... not only is that plain wrong (the CFI should be adjusted after
each instruction that changes the stack pointer), but what the heck is
wrong with using the macros?

	-hpa



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/