linux-kernel - Re: [PATCH] kasan: hw_tags: include linux/vmalloc.h

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Date: Thu, 04 Apr 2024 21:48:24 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Andrew Morton" <akpm@...ux-foundation.org>,
 "Arnd Bergmann" <arnd@...nel.org>
Cc: "Andrey Ryabinin" <ryabinin.a.a@...il.com>,
 "Alexander Potapenko" <glider@...gle.com>,
 "Andrey Konovalov" <andreyknvl@...il.com>,
 "Dmitry Vyukov" <dvyukov@...gle.com>,
 "Vincenzo Frascino" <vincenzo.frascino@....com>,
 "Mark Rutland" <mark.rutland@....com>, kasan-dev@...glegroups.com,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: hw_tags: include linux/vmalloc.h

On Thu, Apr 4, 2024, at 20:17, Andrew Morton wrote:
> On Thu,  4 Apr 2024 14:44:30 +0200 Arnd Bergmann <arnd@...nel.org> wrote:
>
>> From: Arnd Bergmann <arnd@...db.de>
>> 
>> This header is no longer included implicitly and instead needs to be
>> pulled in directly:
>> 
>> mm/kasan/hw_tags.c: In function 'unpoison_vmalloc_pages':
>> mm/kasan/hw_tags.c:280:16: error: implicit declaration of function 'find_vm_area'; did you mean 'find_vma_prev'? [-Werror=implicit-function-declaration]
>>   280 |         area = find_vm_area((void *)addr);
>>       |                ^~~~~~~~~~~~
>>       |                find_vma_prev
>> mm/kasan/hw_tags.c:280:14: error: assignment to 'struct vm_struct *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
>>   280 |         area = find_vm_area((void *)addr);
>>       |              ^
>> mm/kasan/hw_tags.c:284:29: error: invalid use of undefined type 'struct vm_struct'
>>   284 |         for (i = 0; i < area->nr_pages; i++) {
>>       |                             ^~
>> mm/kasan/hw_tags.c:285:41: error: invalid use of undefined type 'struct vm_struct'
>>   285 |                 struct page *page = area->pages[i];
>>       |                                         ^~
>
> Thanks, but I'd like to know which patch this patch is fixing, please. 
> Is it mainline or linux-next?  I'm suspecting it might be a fix for
> fix-missing-vmalloch-includes.patch but without knowing how to
> reproduce this I can't determine anything.

It only showed up yesterday in linux-next. I thought about
bisecting it but ended up not doing it as it seemed simple
enough.

fix-missing-vmalloch-includes.patch looks like the right
place to me, given both the timing and contents, so please
fold my change into that.

      Arnd