linux-kernel - Re: [PATCH] mm: remove kern_addr

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Date:   Tue, 18 Oct 2022 10:03:50 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-alpha@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org,
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        Peter Zijlstra <peterz@...radead.org>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: Re: [PATCH] mm: remove kern_addr_valid() completely

On Tue, Oct 18, 2022 at 03:40:14PM +0800, Kefeng Wang wrote:
> Most architectures(except arm64/x86/sparc) simply return 1 for
> kern_addr_valid(), which is only used in read_kcore(), and it
> calls copy_from_kernel_nofault() which could check whether the
> address is a valid kernel address, so no need kern_addr_valid(),
> let's remove unneeded kern_addr_valid() completely.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
...
>  arch/s390/include/asm/pgtable.h           |  2 -

For s390:
Acked-by: Heiko Carstens <hca@...ux.ibm.com>