Re: [PATCH 3/5] mm: powerpc ptlock comments

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 22 Nov 2005, Paul Mackerras wrote:
> 
> > Update comments (only) on page_table_lock and mmap_sem in arch/powerpc.
> 
> [snip]
> 
> >  	/*
> > -	 * No need to use ldarx/stdcx here because all who
> > -	 * might be updating the pte will hold the
> > -	 * page_table_lock
> > +	 * No need to use ldarx/stdcx here
> >  	 */
> 
> If you're going to remove the because clause you might as well remove
> the whole comment.  What you have left is either redundant or
> mystifying (according to the depth of knowledge of the reader).  And
> in fact I don't think I could now say why we don't need an atomic
> update sequence there, so I would appreciate something that updates
> the "because" part.

All I'm doing here is tidying up by removing the no-longer-appropriate
reference to page_table_lock.  As my snipped patch comment said:

> Update comments (only) on page_table_lock and mmap_sem in arch/powerpc.
> Removed the comment on page_table_lock from hash_huge_page: since it's
> no longer taking page_table_lock itself, it's irrelevant whether others
> are; but how it is safe (even against huge file truncation?) I can't say.

I'd appreciate something that updates the "because" part too, but don't
know the answer.  That other patch will need to come from your end - Ben?

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

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux