linux-kernel - Re: [PATCH 1/9] mm: introduce kv[mz]alloc helpers

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Date:   Fri, 2 Jun 2017 07:17:22 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     Michal Hocko <mhocko@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        John Hubbard <jhubbard@...dia.com>,
        Andreas Dilger <adilger@...ger.ca>,
        Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [PATCH 1/9] mm: introduce kv[mz]alloc helpers

On Mon, Mar 06, 2017 at 11:30:24AM +0100, Michal Hocko wrote:
> +void *kvmalloc_node(size_t size, gfp_t flags, int node)
> +{
> +	gfp_t kmalloc_flags = flags;
> +	void *ret;
> +
> +	/*
> +	 * vmalloc uses GFP_KERNEL for some internal allocations (e.g page tables)
> +	 * so the given set of flags has to be compatible.
> +	 */
> +	WARN_ON_ONCE((flags & GFP_KERNEL) != GFP_KERNEL);

Hm, there are quite a few locations in the kernel that do something like:

	__vmalloc(len, GFP_NOFS, PAGE_KERNEL);

According to your patch, vmalloc can't really do GFP_NOFS, right?

-- 

Thanks,
Sasha