linux-kernel - Re: [PATCH v3] ARC: mm: remove __ARCH_USE_5LEVEL

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Date:   Thu, 10 Oct 2019 11:28:03 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3] ARC: mm: remove __ARCH_USE_5LEVEL_HACK

On Wed, Oct 09, 2019 at 06:57:31PM +0000, Vineet Gupta wrote:
> Add the intermediate p4d accessors to make it 5 level compliant.
> 
> This is a non-functional change anyways since ARC has software page walker
> with 2 lookup levels (pgd -> pte)
> 
> There is slight code bloat due to pulling in needless p*d_free_tlb()
> macros which needs to be addressed seperately.
> 
> | bloat-o-meter2 vmlinux-with-5LEVEL_HACK vmlinux-patched
> | add/remove: 0/0 grow/shrink: 2/0 up/down: 128/0 (128)
> | function                                     old     new   delta
> | free_pgd_range                               546     656    +110
> | p4d_clear_bad                                  2      20     +18
> | Total: Before=4137148, After=4137276, chg 0.000000%
> 
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Vineet Gupta <vgupta@...opsys.com>

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov