linux-kernel - Re: [PATCH v4 1/3] vmalloc: Choose a better start address in vm_area_register

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Message-ID: <YWXSIOm0u58vBfJ6@arm.com>
Date:   Tue, 12 Oct 2021 19:21:20 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     will@...nel.org, ryabinin.a.a@...il.com, andreyknvl@...il.com,
        dvyukov@...gle.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, elver@...gle.com,
        akpm@...ux-foundation.org, gregkh@...uxfoundation.org,
        kasan-dev@...glegroups.com
Subject: Re: [PATCH v4 1/3] vmalloc: Choose a better start address in
 vm_area_register_early()

On Fri, Sep 10, 2021 at 01:33:52PM +0800, Kefeng Wang wrote:
> There are some fixed locations in the vmalloc area be reserved
> in ARM(see iotable_init()) and ARM64(see map_kernel()), but for
> pcpu_page_first_chunk(), it calls vm_area_register_early() and
> choose VMALLOC_START as the start address of vmap area which
> could be conflicted with above address, then could trigger a
> BUG_ON in vm_area_add_early().
> 
> Let's choose a suit start address by traversing the vmlist.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

Reviewed-by: Catalin Marinas <catalin.marinas@....com>