linux-kernel - Re: bioset changes in 4.18 broke aha1542

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Date:   Thu, 18 Oct 2018 14:10:31 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Ondrej Zary <linux@...nbow-software.org>
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: bioset changes in 4.18 broke aha1542

On 10/18/18 2:04 PM, Ondrej Zary wrote:
> On Thursday 18 October 2018 21:59:09 Jens Axboe wrote:
>> On 10/18/18 1:55 PM, Ondrej Zary wrote:
>>> On Thursday 18 October 2018 20:58:57 Jens Axboe wrote:
>>>> On 10/18/18 12:34 PM, Ondrej Zary wrote:
>>>>> Hello,
>>>>> aha1542 works fine in 4.17 but crashes in 4.18. It's hard to bisect because
>>>>> of many commits that don't compile.
>>>>> # only skipped commits left to test
>>>>> # possible first bad commit: [52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b] fs: convert block_dev.c to bioset_init()
>>>>> # possible first bad commit: [a47a28b74a5c7c27bf621276b85ad6c124651236] target: convert to bioset_init()/mempool_init()
>>>>> # possible first bad commit: [6f1c819c219f7841079f0f43ab62727a55b0d849] dm: convert to bioset_init()/mempool_init()
>>>>> # possible first bad commit: [afeee514ce7f4cab605beedd03be71ebaf0c5fc8] md: convert to bioset_init()/mempool_init()
>>>>> # possible first bad commit: [d19936a26658a7a53edd5619d631ee2c2c3151a2] bcache: convert to bioset_init()/mempool_init()
>>>>> # possible first bad commit: [b906bbb6997785d9ea0bd3f5585537afa6257c43] lightnvm: convert to bioset_init()/mempool_init()
>>>>>
>>>>> Testing manually, a47a28b74a5c7c27bf621276b85ad6c124651236 works.
>>>>> 52190f8abe7f2bf2b4e5f9760cbcc1427ca2136b does not compile
>>>>> 8ac9f7c1fd1d342e82ddf078425423b050652ba0 does not compile
>>>>> e292d7bc63c8f2adb3dfda27910e805f1b6557f9 does not compile
>>>>> dad08527525f9a8ac9c7f278864c65f94bc5e9b3 does not compile
>>>>> 943cf9f3ca16133dbd00f9a4cbfea46512fcb0e8 works
>>>>> ..
>>>>> fedc3abe7bd2dcc4c80bcf3cff8708a3908d8219 works
>>>>> 04c4950d5b373ba712d928592e05e73510785bca crashes
>>>>
>>>> It looks like the ISA bioset pool isn't being initialized. You should
>>>> have messages like this in your dmesg:
>>>>
>>>> isa pool size: 16 pages
>>>>
>>>> (which you do), but also something on the bioset section. Do you have
>>>> this one:
>>>>
>>>> pool size: 64 pages
>>>>
>>>> as well?
>>>>
>>>
>>> No, it's not there.
>>
>> Can you attach your .config? I'm guessing CONFIG_HIGHMEM* isn't set.
>>
> 
> It is.

Puzzled... Does this work?


diff --git a/block/bounce.c b/block/bounce.c
index b30071ac4ec6..49564a1bfd22 100644
--- a/block/bounce.c
+++ b/block/bounce.c
@@ -35,10 +35,6 @@ static mempool_t page_pool, isa_page_pool;
 static __init int init_emergency_pool(void)
 {
 	int ret;
-#if defined(CONFIG_HIGHMEM) && !defined(CONFIG_MEMORY_HOTPLUG)
-	if (max_pfn <= max_low_pfn)
-		return 0;
-#endif
 
 	ret = mempool_init_page_pool(&page_pool, POOL_SIZE, 0);
 	BUG_ON(ret);

-- 
Jens Axboe