Re: [PATCH 5/7] zram: use crypto api to check alg availability

From: Sergey Senozhatsky
Date: Mon May 30 2016 - 00:57:53 EST

Hello Minchan,

On (05/30/16 13:47), Minchan Kim wrote:
> > can do, sure: make find_backend() depend on crypto_has_comp() only,
> > *may be* printk a message when we have a mismatch in backends array
> > and crypto_has_comp(). but not really sure about the latter one.
> Me, too. We don't need to warn about that. Instead, we should allow loading
> other algorithm which doesn't live in backend array more clearly.
> We need to update documentation to clear it out.

yes, entirely forgot to update the Documentation.

> > > So, from now on, users should be aware of the compression naming and
> > > load module by oneself. It's not kind but I hope admins already knows
> > > what cryto compressor they have.
> >
> > um, I'm not in love with this approach.
> >
> > what admins? zram users may be completely unaware of the existence of
> > the crypto API and the kernel rebuild process. for some people switching
> > to new zram will be a matter of "apt-get upgrade/pacman -Syu", not
> > "git am ...; make menuconfig; make -j...". this looks like a major step
> > back. keeping this dummy list of compressing backends around does not take
> > a lot of effort, especially if we will make it unimportant for find_backend()
> > and only use it for that nice user-friendly `cat /zram/comp_algorithm`
> > output.
> I am not against with it. Instead, please clear it out to write down docuement
> "comp_algorithm is just optional so user can load any new algorithm like this
> blah blah"

ok, will do.