mm, slab: don't wrap internal functions with alloc_hooks()

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 <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Kees Cook <[email protected]>
Reviewed-by: Kent Overstreet <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Vlastimil Babka <[email protected]>

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