linux-kernel - Re: [PATCH 3/3] x86: Define cpu_current_top_of

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Message-ID: <CAK1hOcPcarW2z3mNAmLt9m-dYbkqeA0tiw9k=D+OYqkvmqCdNw@mail.gmail.com>
Date:	Fri, 24 Apr 2015 21:35:08 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, X86 ML <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] x86: Define cpu_current_top_of_stack for 64-bit code

On Fri, Apr 24, 2015 at 5:31 PM, Denys Vlasenko <dvlasenk@...hat.com>
> diff --git a/arch/x86/include/asm/processor.h
b/arch/x86/include/asm/processor.h
> index 23ba676..3754dac 100644
> --- a/arch/x86/include/asm/processor.h
> +++ b/arch/x86/include/asm/processor.h
> @@ -304,6 +304,8 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct tss_struct, cpu_tss);
>
>  #ifdef CONFIG_X86_32
>  DECLARE_PER_CPU(unsigned long, cpu_current_top_of_stack);
> +#else
> +#define cpu_current_top_of_stack (cpu_tss + TSS_sp0)
>  #endif
>
>  /*
> diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h


Oops... this hunk (one touching processor.h) shouldn't be there.
It is bogus. It works simply because this define isn't used
by 64-bit builds. Just drop this hunk. The rest is correct.
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