linux-kernel - Re: [RFC PATCH] mm/vmalloc: request large order pages from buddy allocator

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Message-ID: <aPCXdDPlBMdfFQgK@infradead.org>
Date: Wed, 15 Oct 2025 23:57:56 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Uladzislau Rezki <urezki@...il.com>
Cc: Matthew Wilcox <willy@...radead.org>,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH] mm/vmalloc: request large order pages from buddy
 allocator

On Wed, Oct 15, 2025 at 03:42:50PM +0200, Uladzislau Rezki wrote:
> Agree. We do not want BUG_ON() in split_page(). I think it is better to
> control this even though nobody invokes vmalloc() with __GFP_COMP.

Please explicitly warn and reject vmalloc calls with unsupported
flag.  The fact that many flags get silently ignored or dropped or
could lead to behavior in gfp_t based interfaces is a constant source
of problems.