Re: [PATCH][RFC] mm: swsusp shrink_all_memory tweaks

[Nick Piggin <nickpiggin@yahoo.com.au>]

Con Kolivas wrote:
> On Saturday 18 March 2006 15:52, Nick Piggin wrote:
>
> > Con Kolivas wrote:
> >
> > > #ifdeffery
> >
> > Sorry I don't understand...
>
>
> My bad.
>
> I added the suspend_pass member to struct scan_control within an #ifdef 
> CONFIG_PM to allow it to not be unnecessarily compiled in in the !CONFIG_PM 
> case and wanted to avoid having the #ifdefs in vmscan.c so moved it to a 
> header file.

Oh no, that rule thumb isn't actually "don't put ifdefs in .c files", but
people commonly say it that way anyway. The rule is actually that you should
put ifdefs in declarations rather than call/usage sites.

You did the right thing there by introducing the accessor, which moves the
ifdef out of code that wants to query the member right? But you can still
leave it in the .c file if it is local (which it is).

--
SUSE Labs, Novell Inc.
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