On Wed, 29 Sept 2021 at 14:42, Marco Elver <elver@xxxxxxxxxx> wrote:
>
> On Wed, Sep 29, 2021 at 07:49PM -0400, yanjun.zhu@xxxxxxxxx wrote:
> > From: Zhu Yanjun <yanjun.zhu@xxxxxxxxx>
> >
> > Since the function __kasan_kmalloc is only used in kasan module,
> > remove EXPORT_SYMBOL to this function.
>
> This is incorrect, see below.
>
> > @@ -521,7 +521,6 @@ void * __must_check __kasan_kmalloc(struct kmem_cache *cache, const void *object
> > {
> > return ____kasan_kmalloc(cache, object, size, flags);
> > }
> > -EXPORT_SYMBOL(__kasan_kmalloc);
>
> Sorry, but this will break all users of kmalloc() with KASAN on if
> !TRACING:
*module users.
An allmodconfig but with CONFIG_TRACING=n will probably show you the problem.
> __always_inline kmalloc() include/linux/slab.h
> -> __always_inline kmem_cache_alloc_trace() include/linux/slab.h
> -> __always_inline kasan_kmalloc() include/linux/kasan.h
> -> __kasan_kmalloc() mm/kasan/common.c
