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From: Denys Vlasenko <vda.linux@googlemail.com>
To: Alexander van Heukelum <heukelum@fastmail.fm>
Cc: Andy Lutomirski <luto@amacapital.net>, X86 ML <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Oleg Nesterov <oleg@redhat.com>, Borislav Petkov <bp@suse.de>,
	Rik van Riel <riel@redhat.com>
Subject: Re: [PATCHv2 2/4] x86_64: embrace KERNEL_STACK_OFFSET
Date: Wed, 21 Jan 2015 14:44:10 +0100	[thread overview]
Message-ID: <CAK1hOcMgrpw5+Uz+5U25Xq_1fJNTGc4PUtw+YzGGYBZ-YKaJew@mail.gmail.com> (raw)
In-Reply-To: <1421581520-2816-3-git-send-email-heukelum@fastmail.fm>

On Sun, Jan 18, 2015 at 12:45 PM, Alexander van Heukelum
<heukelum@fastmail.fm> wrote:
> KERNEL_STACK_OFFSET is the offset from the top of the kernel stack
> page to the value of the kernel_stack percpu variable. This patch
> changes KERNEL_STACK_OFFSET to configure a reserved space of 16
> bytes above the user ptregs frame. KERNEL_STACK_OFFSET must be
> set to a multiple of 16 bytes due to the automatic stack alignment
> of interrupts, traps, and exceptions on x86_64.

I propose to set kernel_stack percpu variable to point
to the top of kernel stack (obvious, isn't it?)
and eliminate KERNEL_STACK_OFFSET altogether.

  reply	other threads:[~2015-01-21 13:44 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-18 11:45 [PATCHv2 0/4] x86, entry: some cleanup and simplification Alexander van Heukelum
2015-01-18 11:45 ` [PATCHv2 1/4] x86_64: cleanup THREAD_INFO(reg,offset) macro Alexander van Heukelum
2015-01-21 13:40   ` Denys Vlasenko
2015-01-21 16:20     ` Alexander van Heukelum
2015-01-21 18:04       ` Borislav Petkov
2015-01-21 18:48         ` Alexander van Heukelum
2015-01-18 11:45 ` [PATCHv2 2/4] x86_64: embrace KERNEL_STACK_OFFSET Alexander van Heukelum
2015-01-21 13:44   ` Denys Vlasenko [this message]
2015-01-21 16:29     ` Alexander van Heukelum
2015-01-23  0:53       ` Denys Vlasenko
2015-01-18 11:45 ` [PATCHv2 3/4] i386: clean up KERNEL_STACK_OFFSET Alexander van Heukelum
2015-01-18 11:45 ` [PATCHv2 4/4] x86_64, entry: Create IRET-compatible stack frame at syscall entry Alexander van Heukelum
2015-01-18 16:38   ` Andy Lutomirski
2015-01-18 17:22     ` Alexander van Heukelum
2015-01-18 12:05 ` [PATCHv2 0/4] x86, entry: some cleanup and simplification Borislav Petkov
2015-01-18 15:47   ` Alexander van Heukelum
2015-01-21 13:26     ` Denys Vlasenko
2015-01-21 15:51       ` Alexander van Heukelum

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