linux-kernel - Re: [PATCH v2] mm, slab: don't wrap internal functions with alloc

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Message-ID: <30544807-e9a4-f764-d113-d446242e9f35@google.com>
Date: Mon, 27 May 2024 11:37:16 -0700 (PDT)
From: David Rientjes <rientjes@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
cc: Christoph Lameter <cl@...ux.com>, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    Roman Gushchin <roman.gushchin@...ux.dev>, 
    Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org, 
    linux-kernel@...r.kernel.org, Kent Overstreet <kent.overstreet@...ux.dev>, 
    Suren Baghdasaryan <surenb@...gle.com>, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2] mm, slab: don't wrap internal functions with
 alloc_hooks()

On Mon, 27 May 2024, Vlastimil Babka wrote:

> The functions __kmalloc_noprof(), kmalloc_large_noprof(),
> kmalloc_trace_noprof() and their _node variants are all internal to the
> implementations of kmalloc_noprof() and kmalloc_node_noprof() and are
> only declared in the "public" slab.h and exported so that those
> implementations can be static inline and distinguish the build-time
> constant size variants. The only other users for some of the internal
> functions are slub_kunit and fortify_kunit tests which make very
> short-lived allocations.
> 
> Therefore we can stop wrapping them with the alloc_hooks() macro.
> Instead add a __ prefix to all of them and a comment documenting these
> as internal. Also rename __kmalloc_trace() to __kmalloc_cache() which is
> more descriptive - it is a variant of __kmalloc() where the exact
> kmalloc cache has been already determined.
> 
> The usage in fortify_kunit can be removed completely, as the internal
> functions should be tested already through kmalloc() tests in the
> test variant that passes non-constant allocation size.
> 
> Reported-by: Kent Overstreet <kent.overstreet@...ux.dev>
> Cc: Suren Baghdasaryan <surenb@...gle.com>
> Cc: Kees Cook <keescook@...omium.org>
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Acked-by: David Rientjes <rientjes@...gle.com>