linux-kernel - Re: [PATCH v2 4/4] mm/vmalloc: Hugepage vmalloc mappings

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Message-ID: <20200413134106.GN21484@bombadil.infradead.org>
Date:   Mon, 13 Apr 2020 06:41:06 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 4/4] mm/vmalloc: Hugepage vmalloc mappings

On Mon, Apr 13, 2020 at 10:53:03PM +1000, Nicholas Piggin wrote:
> +static int vmap_pages_range_noflush(unsigned long start, unsigned long end,
> +				    pgprot_t prot, struct page **pages,
> +				    unsigned int page_shift)
> +{
> +	if (page_shift == PAGE_SIZE) {

... I think you meant 'page_shift == PAGE_SHIFT'

Overall I like this series, although it's a bit biased towards CPUs
which have page sizes which match PMD/PUD sizes.  It doesn't offer the
possibility of using 64kB page sizes on ARM, for example.  But it's a
step in the right direction.