x86/asm/entry: Remove unused SAVE_ALL/RESTORE_ALL macros for !CONFIG_x86_64

SAVE_ALL and RESTORE_ALL macros for !CONFIG_X86_64 were
introduced in commit:

  1a338ac32 commit ('sched, x86: Optimize the preempt_schedule() call')

... and were used in the ___preempt_schedule() and ___preempt_schedule_context()
functions from the arch/x86/kernel/preempt.S.

But the arch/x86/kernel/preempt.S file was removed in the following commit:

  0ad6e3c5 commit ('x86: Speed up ___preempt_schedule*() by using THUNK helpers')

The ___preempt_schedule()/___preempt_schedule_context() functions were
reimplemeted and do not use SAVE_ALL/RESTORE_ALL anymore.

These macros have no users anymore, so we can remove them.

Signed-off-by: Alexander Kuleshov <kuleshovmail@gmail.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Borislav Petkov <bp@suse.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1453126394-13717-1-git-send-email-kuleshovmail@gmail.com
[ Improved the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index e32206e..9a9e588 100644 (file)
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -201,37 +201,6 @@ For 32-bit we have the following conventions - kernel is built with
        .byte 0xf1
        .endm
 
-#else /* CONFIG_X86_64 */
-
-/*
- * For 32bit only simplified versions of SAVE_ALL/RESTORE_ALL. These
- * are different from the entry_32.S versions in not changing the segment
- * registers. So only suitable for in kernel use, not when transitioning
- * from or to user space. The resulting stack frame is not a standard
- * pt_regs frame. The main use case is calling C code from assembler
- * when all the registers need to be preserved.
- */
-
-       .macro SAVE_ALL
-       pushl %eax
-       pushl %ebp
-       pushl %edi
-       pushl %esi
-       pushl %edx
-       pushl %ecx
-       pushl %ebx
-       .endm
-
-       .macro RESTORE_ALL
-       popl %ebx
-       popl %ecx
-       popl %edx
-       popl %esi
-       popl %edi
-       popl %ebp
-       popl %eax
-       .endm
-
 #endif /* CONFIG_X86_64 */
 
 /*