linux-kernel - Re: [PATCH 1/1] mm: vmalloc: Bail out early in find_vmap

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Message-ID: <20240326074846.6078-D-hca@linux.ibm.com>
Date: Tue, 26 Mar 2024 08:48:46 +0100
From: Heiko Carstens <hca@...ux.ibm.com>
To: "Uladzislau Rezki (Sony)" <urezki@...il.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, Baoquan He <bhe@...hat.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Dave Chinner <david@...morbit.com>, Guenter Roeck <linux@...ck-us.net>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH 1/1] mm: vmalloc: Bail out early in find_vmap_area() if
 vmap is not init

On Sat, Mar 23, 2024 at 03:15:44PM +0100, Uladzislau Rezki (Sony) wrote:
> During the boot the s390 system triggers "spinlock bad magic" messages
> if the spinlock debugging is enabled:
..
> Some background. It worked before because the lock that is in question
> was statically defined and initialized. As of now, the locks and data
> structures are initialized in the vmalloc_init() function.
> 
> To address that issue add the check whether the "vmap_initialized"
> variable is set, if not find_vmap_area() bails out on entry returning NULL.
> 
> Fixes: 72210662c5a2 ("mm: vmalloc: offload free_vmap_area_lock lock")
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> ---
>  mm/vmalloc.c | 3 +++
>  1 file changed, 3 insertions(+)

Thanks for fixing this, and FWIW:
Acked-by: Heiko Carstens <hca@...ux.ibm.com>