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

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Message-ID: <Y2FblZlz2LIGh5qH@arm.com>
Date:   Tue, 1 Nov 2022 17:47:01 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
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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>

For arm64:

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