x86/entry: Stop using PER_CPU_VAR(kernel_stack)
authorDenys Vlasenko <dvlasenk@redhat.com>
Fri, 24 Apr 2015 15:31:33 +0000 (17:31 +0200)
committerIngo Molnar <mingo@kernel.org>
Fri, 8 May 2015 11:43:52 +0000 (13:43 +0200)
commit63332a8455d8310b77d38779c6c21a660a8d9feb
tree81919d8f8aac70e8ccc7ced0d8f042a472e6969a
parente22438f8e997ac1c8911d8808b6a4c492cd8bc6e
x86/entry: Stop using PER_CPU_VAR(kernel_stack)

PER_CPU_VAR(kernel_stack) is redundant:

  - On the 64-bit build, we can use PER_CPU_VAR(cpu_tss + TSS_sp0).
  - On the 32-bit build, we can use PER_CPU_VAR(cpu_current_top_of_stack).

PER_CPU_VAR(kernel_stack) will be deleted by a separate change.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1429889495-27850-1-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/ia32/ia32entry.S
arch/x86/include/asm/thread_info.h
arch/x86/kernel/entry_64.S
arch/x86/xen/xen-asm_64.S