linux-kernel - Re: [PATCH v3 03/46] kasan: common: adapt to the new prototype of __stack_depot

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Message-ID: <Ymk7ZkkIq6rF+BmI@elver.google.com>
Date:   Wed, 27 Apr 2022 14:47:34 +0200
From:   Marco Elver <elver@...gle.com>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Christoph Hellwig <hch@....de>,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ilya Leoshkevich <iii@...ux.ibm.com>,
        Ingo Molnar <mingo@...hat.com>, Jens Axboe <axboe@...nel.dk>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Kees Cook <keescook@...omium.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Pekka Enberg <penberg@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Vegard Nossum <vegard.nossum@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 03/46] kasan: common: adapt to the new prototype of
 __stack_depot_save()

On Tue, Apr 26, 2022 at 06:42PM +0200, Alexander Potapenko wrote:
> Pass extra_bits=0, as KASAN does not intend to store additional
> information in the stack handle. No functional change.
> 
> Signed-off-by: Alexander Potapenko <glider@...gle.com>

I think this patch needs to be folded into the previous one, otherwise
bisection will be broken.

> ---
> Link: https://linux-review.googlesource.com/id/I932d8f4f11a41b7483e0d57078744cc94697607a
> ---
>  mm/kasan/common.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> index d9079ec11f313..5d244746ac4fe 100644
> --- a/mm/kasan/common.c
> +++ b/mm/kasan/common.c
> @@ -36,7 +36,7 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc)
>  	unsigned int nr_entries;
>  
>  	nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0);
> -	return __stack_depot_save(entries, nr_entries, flags, can_alloc);
> +	return __stack_depot_save(entries, nr_entries, 0, flags, can_alloc);
>  }
>  
>  void kasan_set_track(struct kasan_track *track, gfp_t flags)
> -- 
> 2.36.0.rc2.479.g8af0fa9b8e-goog
>