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Message-ID: <20191002091304.Horde.44CFpqD3KN1HHZOT0U8wSQ7@messagerie.si.c-s.fr>
Date: Wed, 02 Oct 2019 09:13:04 +0200
From: Christophe Leroy <christophe.leroy@....fr>
To: Daniel Axtens <dja@...ens.net>
Cc: gor@...ux.ibm.com, linuxppc-dev@...ts.ozlabs.org,
dvyukov@...gle.com, mark.rutland@....com,
linux-kernel@...r.kernel.org, luto@...nel.org, glider@...gle.com,
aryabinin@...tuozzo.com, x86@...nel.org, linux-mm@...ck.org,
kasan-dev@...glegroups.com, Uladzislau Rezki <urezki@...il.com>
Subject: Re: [PATCH v8 1/5] kasan: support backing vmalloc space with real
shadow memory
Daniel Axtens <dja@...ens.net> a écrit :
> Hi,
>
>>> /*
>>> * Find a place in the tree where VA potentially will be
>>> * inserted, unless it is merged with its sibling/siblings.
>>> @@ -741,6 +752,10 @@ merge_or_add_vmap_area(struct vmap_area *va,
>>> if (sibling->va_end == va->va_start) {
>>> sibling->va_end = va->va_end;
>>>
>>> + kasan_release_vmalloc(orig_start, orig_end,
>>> + sibling->va_start,
>>> + sibling->va_end);
>>> +
>> The same.
>
> The call to kasan_release_vmalloc() is a static inline no-op if
> CONFIG_KASAN_VMALLOC is not defined, which I thought was the preferred
> way to do things rather than sprinkling the code with ifdefs?
>
> The complier should be smart enough to eliminate all the
> orig_state/orig_end stuff at compile time because it can see that it's
> not used, so there's no cost in the binary.
>
Daniel,
You are entirely right in your way to do i, that's fully in line with
Linux kernel codying style
https://www.kernel.org/doc/html/latest/process/coding-style.html#conditional-compilation
Christophe
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