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Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory

From Pasha Tatashin <pasha.tatashin@oracle.com>
Newsgroups linux.kernel
Subject Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory
Date 2017-08-08 15:40 +0200
Message-ID <uccTM-z0-15@gated-at.bofh.it> (permalink)
References <ubX8m-5vB-5@gated-at.bofh.it> <ubX8n-5vB-47@gated-at.bofh.it> <uc8Gt-5Tu-1@gated-at.bofh.it> <ucbl0-7TS-33@gated-at.bofh.it> <uccAq-rl-21@gated-at.bofh.it>
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On 2017-08-08 09:15, David Laight wrote:
> From: Pasha Tatashin
>> Sent: 08 August 2017 12:49
>> Thank you for looking at this change. What you described was in my
>> previous iterations of this project.
>>
>> See for example here: https://lkml.org/lkml/2017/5/5/369
>>
>> I was asked to remove that flag, and only zero memory in place when
>> needed. Overall the current approach is better everywhere else in the
>> kernel, but it adds a little extra code to kasan initialization.
> 
> Perhaps you could #define the function prototype(s?) so that the flags
> are not passed unless it is a kasan build?
> 

Hi David,

Thank you for suggestion. I think a kasan specific vmemmap (what I 
described in the previous e-mail) would be a better solution over having 
different prototypes with different builds.  It would be cleaner to have 
all kasan specific code in one place.

Pasha

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Thread

[v6 00/15] complete deferred page initialization Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
  [v6 09/15] sparc64: optimized struct page zeroing Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 09/15] sparc64: optimized struct page zeroing Michal Hocko <mhocko@kernel.org> - 2017-08-11 15:00 +0200
      Re: [v6 09/15] sparc64: optimized struct page zeroing Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:10 +0200
  [v6 08/15] mm: zero struct pages during initialization Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 08/15] mm: zero struct pages during initialization Michal Hocko <mhocko@kernel.org> - 2017-08-11 15:00 +0200
      Re: [v6 08/15] mm: zero struct pages during initialization Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:10 +0200
  [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Michal Hocko <mhocko@kernel.org> - 2017-08-11 14:50 +0200
      Re: [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Michal Hocko <mhocko@kernel.org> - 2017-08-11 18:10 +0200
        Re: [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:30 +0200
      Re: [v6 07/15] mm: defining memblock_virt_alloc_try_nid_raw Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:10 +0200
  [v6 10/15] x86/kasan: explicitly zero kasan shadow memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
  [v6 05/15] mm: don't accessed uninitialized struct pages Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 05/15] mm: don't accessed uninitialized struct pages Michal Hocko <mhocko@kernel.org> - 2017-08-11 11:40 +0200
      Re: [v6 05/15] mm: don't accessed uninitialized struct pages Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:00 +0200
  [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Will Deacon <will.deacon@arm.com> - 2017-08-08 11:10 +0200
      Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-08 14:00 +0200
        Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Will Deacon <will.deacon@arm.com> - 2017-08-08 14:40 +0200
          Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-08 15:00 +0200
        RE: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory David Laight <David.Laight@ACULAB.COM> - 2017-08-08 15:20 +0200
          Re: [v6 11/15] arm64/kasan: explicitly zero kasan shadow memory Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-08 15:40 +0200
  [v6 13/15] mm: stop zeroing memory during allocation in vmemmap Pavel Tatashin <pasha.tatashin@oracle.com> - 2017-08-07 22:50 +0200
    Re: [v6 13/15] mm: stop zeroing memory during allocation in vmemmap Michal Hocko <mhocko@kernel.org> - 2017-08-11 15:10 +0200
      Re: [v6 13/15] mm: stop zeroing memory during allocation in vmemmap Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 18:20 +0200
  Re: [v6 00/15] complete deferred page initialization Michal Hocko <mhocko@kernel.org> - 2017-08-11 10:00 +0200
    Re: [v6 00/15] complete deferred page initialization Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-08-11 17:20 +0200
      Re: [v6 00/15] complete deferred page initialization Michal Hocko <mhocko@kernel.org> - 2017-08-11 17:30 +0200

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