linux-kernel - Re: [PATCH 2/2] mm: kvmalloc: align kvrealloc() with krealloc()

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Message-ID: <ZpiJvj1_rKodpVSt@infradead.org>
Date: Wed, 17 Jul 2024 20:19:26 -0700
From: Christoph Hellwig <hch@...radead.org>
To: Danilo Krummrich <dakr@...nel.org>
Cc: cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
	iamjoonsoo.kim@....com, akpm@...ux-foundation.org, vbabka@...e.cz,
	roman.gushchin@...ux.dev, 42.hyeyoo@...il.com, urezki@...il.com,
	hch@...radead.org, kees@...nel.org, ojeda@...nel.org,
	wedsonaf@...il.com, mhocko@...nel.org, mpe@...erman.id.au,
	chandan.babu@...cle.com, christian.koenig@....com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: kvmalloc: align kvrealloc() with krealloc()

> +extern void *kvrealloc_noprof(const void *p, size_t size, gfp_t flags) __realloc_size(2);

Please drop the extern while you're at it and move the __realloc_size
attribute to a separate line.

> +static gfp_t to_kmalloc_flags(gfp_t flags, size_t size)
> +{
> +	if (size > PAGE_SIZE) {
> +		flags |= __GFP_NOWARN;
> +
> +		if (!(flags & __GFP_RETRY_MAYFAIL))
> +			flags |= __GFP_NORETRY;
> +
> +		/* nofail semantic is implemented by the vmalloc fallback */
> +		flags &= ~__GFP_NOFAIL;
> +	}
> +
> +	return flags;

The name for this function sounds a bit odd.  Maybe kmalloc_gfp_adjust
instead?  Also the comment explaining these flags tweaks should move
from the caller to this function.