From: Pratyush Yadav <pratyush@kernel.org>
To: Michal Clapinski <mclapinski@google.com>
Cc: Evangelos Petrongonas <epetron@amazon.de>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Mike Rapoport <rppt@kernel.org>,
Pratyush Yadav <pratyush@kernel.org>,
Alexander Graf <graf@amazon.com>,
kexec@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v2] kho: add support for deferred struct page init
Date: Tue, 10 Feb 2026 14:55:22 +0100 [thread overview]
Message-ID: <2vxzecmssnxx.fsf@kernel.org> (raw)
In-Reply-To: <20260210130418.297153-1-mclapinski@google.com> (Michal Clapinski's message of "Tue, 10 Feb 2026 14:04:18 +0100")
On Tue, Feb 10 2026, Michal Clapinski wrote:
> When `CONFIG_DEFERRED_STRUCT_PAGE_INIT` is enabled, struct page
> initialization is deferred to parallel kthreads that run later
> in the boot process.
>
> During KHO restoration, `deserialize_bitmap()` writes metadata for
> each preserved memory region. However, if the struct page has not been
> initialized, this write targets uninitialized memory, potentially
> leading to errors like:
> ```
> BUG: unable to handle page fault for address: ...
> ```
>
> Fix this by introducing `kho_get_preserved_page()`, which ensures
> all struct pages in a preserved region are initialized by calling
> `init_deferred_page()` which is a no-op when deferred init is disabled
> or when the struct page is already initialized.
>
> Signed-off-by: Evangelos Petrongonas <epetron@amazon.de>
> Signed-off-by: Michal Clapinski <mclapinski@google.com>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
[...]
--
Regards,
Pratyush Yadav
next prev parent reply other threads:[~2026-02-10 13:55 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-10 13:04 Michal Clapinski
2026-02-10 13:55 ` Pratyush Yadav [this message]
2026-02-10 14:00 ` Pratyush Yadav
2026-02-10 15:09 ` Mike Rapoport
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