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From: Daniel Axtens <dja@axtens.net>
To: Uladzislau Rezki <urezki@gmail.com>
Cc: kasan-dev@googlegroups.com, linux-mm@kvack.org, x86@kernel.org,
	aryabinin@virtuozzo.com, glider@google.com, luto@kernel.org,
	linux-kernel@vger.kernel.org, mark.rutland@arm.com,
	dvyukov@google.com, christophe.leroy@c-s.fr,
	linuxppc-dev@lists.ozlabs.org, gor@linux.ibm.com
Subject: Re: [PATCH v8 1/5] kasan: support backing vmalloc space with real shadow memory
Date: Wed, 02 Oct 2019 11:23:06 +1000	[thread overview]
Message-ID: <87zhik2b5x.fsf@dja-thinkpad.axtens.net> (raw)
In-Reply-To: <20191001101707.GA21929@pc636>

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.

Regards,
Daniel


  reply	other threads:[~2019-10-02  1:23 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-01  6:58 [PATCH v8 0/5] kasan: support backing vmalloc space with real shadow memory Daniel Axtens
2019-10-01  6:58 ` [PATCH v8 1/5] " Daniel Axtens
2019-10-01 10:17   ` Uladzislau Rezki
2019-10-02  1:23     ` Daniel Axtens [this message]
2019-10-02  7:13       ` Christophe Leroy
2019-10-02 11:49       ` Uladzislau Rezki
2019-10-07  8:02   ` Uladzislau Rezki
2019-10-11  5:15     ` Daniel Axtens
2019-10-11 19:57   ` Andrey Ryabinin
2019-10-14 13:57     ` Daniel Axtens
2019-10-14 15:27       ` Mark Rutland
2019-10-15  6:32         ` Daniel Axtens
2019-10-15  6:29       ` Daniel Axtens
2019-10-16 12:19       ` Andrey Ryabinin
2019-10-16 13:22         ` Mark Rutland
2019-10-18 10:43           ` Andrey Ryabinin
2019-10-28  7:39             ` Daniel Axtens
2019-10-28  1:26           ` Daniel Axtens
2019-10-14 15:43   ` Mark Rutland
2019-10-15  6:27     ` Daniel Axtens
2019-10-01  6:58 ` [PATCH v8 2/5] kasan: add test for vmalloc Daniel Axtens
2019-10-01  6:58 ` [PATCH v8 3/5] fork: support VMAP_STACK with KASAN_VMALLOC Daniel Axtens
2019-10-01  6:58 ` [PATCH v8 4/5] x86/kasan: support KASAN_VMALLOC Daniel Axtens
2019-10-01  6:58 ` [PATCH v8 5/5] kasan debug: track pages allocated for vmalloc shadow Daniel Axtens

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