From: Mark Rutland <mark.rutland@arm.com>
To: Pavel Tatashin <pasha.tatashin@oracle.com>
Cc: linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org,
linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
x86@kernel.org, kasan-dev@googlegroups.com,
borntraeger@de.ibm.com, heiko.carstens@de.ibm.com,
davem@davemloft.net, willy@infradead.org, mhocko@kernel.org,
ard.biesheuvel@linaro.org, will.deacon@arm.com,
catalin.marinas@arm.com, sam@ravnborg.org,
mgorman@techsingularity.net, Steven.Sistare@oracle.com,
daniel.m.jordan@oracle.com, bob.picco@oracle.com
Subject: Re: [PATCH v8 10/11] arm64/kasan: explicitly zero kasan shadow memory
Date: Fri, 15 Sep 2017 21:38:53 +0100 [thread overview]
Message-ID: <20170915203852.GA10749@remoulade> (raw)
In-Reply-To: <c76f72fc-21ed-62d0-014e-8509c0374f96@oracle.com>
On Thu, Sep 14, 2017 at 09:30:28PM -0400, Pavel Tatashin wrote:
> Hi Mark,
>
> Thank you for looking at this. We can't do this because page table is not
> set until cpu_replace_ttbr1() is called. So, we can't do memset() on this
> memory until then.
I see. Sorry, I had missed that we were on the temporary tables at this point
in time.
I'm still not keen on duplicating the iteration. Can we split the vmemmap code
so that we have a variant that takes a GFP?
That way we could explicitly pass __GFP_ZERO for those cases where we want a
zeroed page, and are happy to pay the cost of initialization.
Thanks
Mark.
next prev parent reply other threads:[~2017-09-15 20:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-14 22:35 [PATCH v7 00/11] complete deferred page initialization Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 01/11] x86/mm: setting fields in deferred pages Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 02/11] sparc64/mm: " Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 03/11] mm: deferred_init_memmap improvements Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 04/11] sparc64: simplify vmemmap_populate Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 05/11] mm: defining memblock_virt_alloc_try_nid_raw Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 06/11] mm: zero struct pages during initialization Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 07/11] sparc64: optimized struct page zeroing Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 08/11] mm: zero reserved and unavailable struct pages Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 09/11] x86/kasan: explicitly zero kasan shadow memory Pavel Tatashin
2017-09-14 22:35 ` [PATCH v8 10/11] arm64/kasan: " Pavel Tatashin
2017-09-15 1:10 ` Mark Rutland
2017-09-15 1:30 ` Pavel Tatashin
2017-09-15 20:38 ` Mark Rutland [this message]
2017-09-15 21:20 ` Pavel Tatashin
2017-09-15 21:51 ` Mark Rutland
2017-09-14 22:35 ` [PATCH v8 11/11] mm: stop zeroing memory during allocation in vmemmap Pavel Tatashin
2017-09-14 22:40 ` [PATCH v8 00/11] complete deferred page initialization Pavel Tatashin
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