Re: [PATCHv2 2/4] x86_64: embrace KERNEL_STACK_OFFSET

[Denys Vlasenko]

On Sun, Jan 18, 2015 at 12:45 PM, Alexander van Heukelum
<heukelum@xxxxxxxxxxx> 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.
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