Re: [PATCH v2 08/20] kasan: inline random_tag for HW_TAGS

[Andrey Konovalov <andreyknvl@google.com>]

On Wed, Nov 11, 2020 at 6:02 PM Marco Elver <elver@google.com> wrote:
>
> On Tue, Nov 10, 2020 at 11:20PM +0100, Andrey Konovalov wrote:
> > Using random_tag() currently results in a function call. Move its
> > definition to mm/kasan/kasan.h and turn it into a static inline function
> > for hardware tag-based mode to avoid uneeded function calls.
> >
> > Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
> > Link: https://linux-review.googlesource.com/id/Iac5b2faf9a912900e16cca6834d621f5d4abf427
> > ---
> >  mm/kasan/hw_tags.c |  5 -----
> >  mm/kasan/kasan.h   | 34 +++++++++++++++++-----------------
> >  2 files changed, 17 insertions(+), 22 deletions(-)
>
> Reviewed-by: Marco Elver <elver@google.com>
>
> But see style comments below.
>
> > diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
> > index 49ea5f5c5643..1476ac07666e 100644
> > --- a/mm/kasan/hw_tags.c
> > +++ b/mm/kasan/hw_tags.c
> > @@ -42,11 +42,6 @@ void kasan_unpoison_memory(const void *address, size_t size)
> >                       round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
> >  }
> >
> > -u8 random_tag(void)
> > -{
> > -     return hw_get_random_tag();
> > -}
> > -
> >  bool check_invalid_free(void *addr)
> >  {
> >       u8 ptr_tag = get_tag(addr);
> > diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> > index 8a5501ef2339..7498839a15d3 100644
> > --- a/mm/kasan/kasan.h
> > +++ b/mm/kasan/kasan.h
> > @@ -188,6 +188,12 @@ static inline bool addr_has_metadata(const void *addr)
> >
> >  #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
> >
> > +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
> > +void print_tags(u8 addr_tag, const void *addr);
> > +#else
> > +static inline void print_tags(u8 addr_tag, const void *addr) { }
> > +#endif
> > +
> >  bool check_invalid_free(void *addr);
> >
> >  void *find_first_bad_addr(void *addr, size_t size);
> > @@ -223,23 +229,6 @@ static inline void quarantine_reduce(void) { }
> >  static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
> >  #endif
> >
> > -#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
> > -
> > -void print_tags(u8 addr_tag, const void *addr);
> > -
> > -u8 random_tag(void);
> > -
> > -#else
> > -
> > -static inline void print_tags(u8 addr_tag, const void *addr) { }
> > -
> > -static inline u8 random_tag(void)
> > -{
> > -     return 0;
> > -}
> > -
> > -#endif
> > -
> >  #ifndef arch_kasan_set_tag
> >  static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
> >  {
> > @@ -279,6 +268,17 @@ static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
> >
> >  #endif /* CONFIG_KASAN_HW_TAGS */
> >
> > +#ifdef CONFIG_KASAN_SW_TAGS
> > +u8 random_tag(void);
> > +#elif defined(CONFIG_KASAN_HW_TAGS)
> > +#define random_tag() hw_get_random_tag()
>
> Shouldn't this also be a function?
>
> +static inline u8 random_tag(void) { return hw_get_random_tag(); }
>
> Or is there a reason why this was made a macro?

No reason, will turn into a function in v10.

>
> > +#else
> > +static inline u8 random_tag(void)
> > +{
> > +     return 0;
> > +}
>
> Could just be on 1 line:
>
> +static inline u8 random_tag(void) { return 0; }

Will do in v10.

Thanks!

>
> > +#endif
> > +
> >  /*
> >   * Exported functions for interfaces called from assembly or from generated
> >   * code. Declarations here to avoid warning about missing declarations.
> > --
> > 2.29.2.222.g5d2a92d10f8-goog
> >