From: Mike Rapoport <rppt@kernel.org>
To: Oscar Salvador <osalvador@suse.de>
Cc: Changyuan Lyu <changyuanl@google.com>,
akpm@linux-foundation.org, bhe@redhat.com, chrisl@kernel.org,
graf@amazon.com, jasonmiu@google.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
pasha.tatashin@soleen.com
Subject: Re: [PATCH 1/2] memblock: show a warning if allocation in KHO scratch fails
Date: Wed, 21 May 2025 18:27:03 +0300 [thread overview]
Message-ID: <aC3wx5erybg00SaQ@kernel.org> (raw)
In-Reply-To: <aC2TdzP1AwYrQdcW@localhost.localdomain>
On Wed, May 21, 2025 at 10:48:55AM +0200, Oscar Salvador wrote:
> On Wed, May 21, 2025 at 10:43:15AM +0300, Mike Rapoport wrote:
> > I think we should just make sparse_init_nid() panic or at least change
> > "sparse_init_nid: node[0] memory map backing failed. Some memory will not be available."
> > to something more visible and clear.
>
> Panicking the system seems a bit too harsh.
> Those sections will not be initialized, and sure you will lose some memory,
> but still.
>
> I think that making sure that subsection_map_init() does not access
> non-initialized values is enough.
It's not only subsection_map_init(), next failing one is
memmap_init_range() and maybe there's more, but we can audit and fix them.
I believe all those accesses are at init time because after system is
booted we are careful to avoid accessing absent sections.
> Because wrt. error message, I am not sure it can get more clear that we
> failed we allocate memory to back the section and so that section will
> not be activated :-)
Add a dump_stack()? ;-)
> --
> Oscar Salvador
> SUSE Labs
>
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2025-05-21 15:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-18 14:23 [PATCH 0/2] KHO Fixes Changyuan Lyu
2025-05-18 14:23 ` [PATCH 1/2] memblock: show a warning if allocation in KHO scratch fails Changyuan Lyu
2025-05-18 16:07 ` Mike Rapoport
2025-05-21 7:03 ` Changyuan Lyu
2025-05-21 7:43 ` Mike Rapoport
2025-05-21 8:48 ` Oscar Salvador
2025-05-21 15:27 ` Mike Rapoport [this message]
2025-05-18 14:23 ` [PATCH 2/2] KHO: init new_physxa->phys_bits to fix lockdep Changyuan Lyu
2025-05-18 15:51 ` Mike Rapoport
2025-05-19 12:10 ` Pasha Tatashin
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