Re: [PATCH 1/2] x86: stop using PER_CPU_VAR(kernel_stack)

[Steven Rostedt]

On Sat, 21 Mar 2015 21:44:37 +0100
Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:

> Instead of PER_CPU_VAR(kernel_stack), 64-bit code
> can use PER_CPU_VAR(cpu_tss + TSS_sp0).

The change log here is lacking an answer to "why". It only states what
it does. What's wrong with using kernel_stack? The change log should
explicitly state that. I have no idea why this patch is needed.

-- Steve

> 
> 32-bit code switches to PER_CPU_VAR(cpu_current_top_of_stack),
> which has the same value.
> 

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