linux-kernel - Re: linux-next: manual merge of the refactor-heap tree with the block tree

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Message-ID: <Zj1RzZdtfL7UQax1@visitorckw-System-Product-Name>
Date: Fri, 10 May 2024 06:44:29 +0800
From: Kuan-Wei Chiu <visitorckw@...il.com>
To: Kent Overstreet <kent.overstreet@...ux.dev>, Coly Li <colyli@...e.de>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>, Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Next Mailing List <linux-next@...r.kernel.org>,
	Matthew Mirvish <matthew@...2.xyz>
Subject: Re: linux-next: manual merge of the refactor-heap tree with the
 block tree

On Thu, May 09, 2024 at 03:58:57PM -0400, Kent Overstreet wrote:
> On Thu, May 09, 2024 at 03:27:45PM +1000, Stephen Rothwell wrote:
> > Hi all,
> > 
> > Today's linux-next merge of the refactor-heap tree got conflicts in:
> > 
> >   drivers/md/bcache/bset.c
> >   drivers/md/bcache/bset.h
> >   drivers/md/bcache/btree.c
> >   drivers/md/bcache/writeback.c
> > 
> > between commit:
> > 
> >   3a861560ccb3 ("bcache: fix variable length array abuse in btree_iter")
> > 
> > from the block tree and commit:
> > 
> >   afa5721abaaa ("bcache: Remove heap-related macros and switch to generic min_heap")
> > 
> > from the refactor-heap tree.
> > 
> > Ok, these conflicts are too extensive, so I am dropping the refactor-heap
> > tree for today.  I suggest you all get together and sort something out.
> 
> Coli and Kuan, you guys will need to get this sorted out quick if we
> want refactor-heap to make the merge window

Hi Coli and Kent,

If I understand correctly, the reported bug is because we attempted to
point (heap)->data to a dynamically allocated memory , but at that time
(heap)->data was not a regular pointer but a fixed size array with a
length of MAX_BSETS.

In my refactor heap patch series, I introduced a preallocated array and
decided in min_heap_init() whether the data pointer should point to an
incoming pointer or to the preallocated array. Therefore, I am
wondering if my patch might have unintentionally fixed this bug?

I am unsure how to reproduce the reported issue. Could you assist me in
verifying whether my assumption is correct?

Regards,
Kuan-Wei