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From: James Morse <james.morse@arm.com>
To: Jun Yao <yaojun8558363@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com,
	will.deacon@arm.com, linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH v4 0/6] arm64/mm: Move swapper_pg_dir to rodata
Date: Fri, 7 Sep 2018 10:57:06 +0100	[thread overview]
Message-ID: <3748f344-465e-63ee-8a9b-5ac1502163c2@arm.com> (raw)
In-Reply-To: <20180822095432.12125-1-yaojun8558363@gmail.com>

Hi Jun,

(I'm a bit confused about which version of this series I should be looking at.
I have a v4, and two v4-resends, all of which are different. Please only mark
something as 'resend' if it is exactly the same!)


On 22/08/18 10:54, Jun Yao wrote:
> The set_init_mm_pgd() is reimplemented using assembly in order to
> avoid being instrumented by kasan.

There are some tidier ways of fixing this. The kasan init code is also C code
that is run before kasan is initialized. Kbuild is told not to let KASAN touch
it with 'KASAN_SANITISE_filename.o := n'.

But, in this case you're only calling into C code from pre-kasan head.S so you
can use the same helper to set init_mm.pgd. I don't think this is worth the
effort, we can just do the store in assembly. (more in patch 3).


Thanks,

James

      parent reply	other threads:[~2018-09-07  9:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-22  9:54 Jun Yao
2018-08-22  9:54 ` [RESEND PATCH v4 1/6] arm64/mm: Introduce the init_pg_dir Jun Yao
2018-09-07  9:57   ` James Morse
2018-08-22  9:54 ` [RESEND PATCH v4 2/6] arm64/mm: Pass ttbr1 as a parameter to __enable_mmu() Jun Yao
2018-09-07  9:57   ` James Morse
2018-08-22  9:54 ` [RESEND PATCH v4 3/6] arm64/mm: Create the initial page table in the init_pg_dir Jun Yao
2018-09-07  9:57   ` James Morse
2018-08-22  9:54 ` [RESEND PATCH v4 4/6] arm64/mm: Create the final page table directly in swapper_pg_dir Jun Yao
2018-09-07  9:57   ` James Morse
2018-08-22  9:54 ` [RESEND PATCH v4 5/6] arm64/mm: Populate the swapper_pg_dir by fixmap Jun Yao
2018-09-07  9:58   ` James Morse
2018-09-10 11:41     ` Jun Yao
2018-09-14  8:44       ` James Morse
2018-09-13 10:50     ` Jun Yao
2018-09-14  8:38       ` James Morse
2018-08-22  9:54 ` [RESEND PATCH v4 6/6] arm64/mm: Move {idmap_pg_dir .. swapper_pg_dir} to rodata section Jun Yao
2018-09-07  9:57 ` James Morse [this message]

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