linux-kernel - Re: Announcement: STEC EnhanceIO SSD caching software for Linux kernel

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Date:	Fri, 11 Jan 2013 23:36:04 +0100
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	Amit Kale <akale@...c-inc.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Announcement: STEC EnhanceIO SSD caching software for Linux
 kernel

On Sat, Jan 12, 2013 at 01:18:37AM +0800, Amit Kale wrote:
> Greetings,
> 
> STEC is happy to announce hosting of our EnhanceIO SSD caching software on github.
> We would like to invite kernel hackers to try it. We'll appreciate your
> valuable feedback to help us improve it to the standards of Linux kernel
> source code. We hope to eventually submit it for a possible inclusion in
> Linux kernel.

If you are serious about inclusion in Linux kernel sources, you may want to
act on these comments:
- kernel API wrappers should be removed
- your ioctl won't work with 32-bit userspace on 64-bit kernel (differences
  in size and padding of struct cache_rec_short fields)
- volatiles (probably) should go, see Documentation/volatile-considered-harmful.txt
- printk wrappers can be easily replaced by pr_debug/pr_info/etc
- the code should be more or less checkpatch.pl clean
- this is buggy: VERIFY(spin_is_locked((sl))); - spin_is_locked always returns
  0 on !CONFIG_SMP && !CONFIG_DEBUG_SPINLOCK

> (...)
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FYI, most people are annoyed when they see those kind of threats on public
mailing lists...

Marcin
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