* /proc/*/maps broken on nommu
@ 2023-09-17 11:38 Max Filippov
2023-09-17 15:06 ` Randy Dunlap
0 siblings, 1 reply; 2+ messages in thread
From: Max Filippov @ 2023-09-17 11:38 UTC (permalink / raw)
To: LKML, Linux Memory Management List
Cc: Matthew Wilcox, Yu Zhao, Liam R. Howlett, Vlastimil Babka,
Davidlohr Bueso, Andrew Morton
Hello,
As of v6.5 cat /proc/*/maps produces empty output on nommu xtensa systems.
Bisection points to the commit 0c563f148043 ("proc: remove VMA rbtree
use from nommu").
It looks like the issue may be not in the m_start (where find_vma(mm,
addr) returns
NULL), but in the nommu version of find_vma itself. I've tried replacing nommu
find_vma implementation with an implementation of the MMU version and it
fixes the /proc/*/maps output. Kind of (it works as expected on one of
my systems,
but consistently locks up on the other).
Any suggestions of what might be wrong/how to fix it properly?
--
Thanks.
-- Max
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: /proc/*/maps broken on nommu
2023-09-17 11:38 /proc/*/maps broken on nommu Max Filippov
@ 2023-09-17 15:06 ` Randy Dunlap
0 siblings, 0 replies; 2+ messages in thread
From: Randy Dunlap @ 2023-09-17 15:06 UTC (permalink / raw)
To: Max Filippov, LKML, Linux Memory Management List
Cc: Matthew Wilcox, Yu Zhao, Liam R. Howlett, Vlastimil Babka,
Davidlohr Bueso, Andrew Morton
On 9/17/23 04:38, Max Filippov wrote:
> Hello,
>
> As of v6.5 cat /proc/*/maps produces empty output on nommu xtensa systems.
> Bisection points to the commit 0c563f148043 ("proc: remove VMA rbtree
> use from nommu").
> It looks like the issue may be not in the m_start (where find_vma(mm,
> addr) returns
> NULL), but in the nommu version of find_vma itself. I've tried replacing nommu
> find_vma implementation with an implementation of the MMU version and it
> fixes the /proc/*/maps output. Kind of (it works as expected on one of
> my systems,
> but consistently locks up on the other).
>
> Any suggestions of what might be wrong/how to fix it properly?
>
Hi Max,
There is already a proposed patch and some discussion:
https://lore.kernel.org/lkml/20230915160055.971059-2-ben.wolsieffer@hefring.com/
--
~Randy
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