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

From: tip-bot for Alexander Kuleshov
Date: Tue Jan 19 2016 - 08:38:24 EST

Commit-ID: 2024315124b43bb8b25a119ec6c614f0647dcc6d
Gitweb: http://git.kernel.org/tip/2024315124b43bb8b25a119ec6c614f0647dcc6d
Author: Alexander Kuleshov <kuleshovmail@xxxxxxxxx>
AuthorDate: Mon, 18 Jan 2016 20:13:14 +0600
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 19 Jan 2016 08:24:03 +0100

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@xxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Brian Gerst <brgerst@xxxxxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1453126394-13717-1-git-send-email-kuleshovmail@xxxxxxxxx
[ Improved the changelog. ]
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
arch/x86/entry/calling.h | 31 -------------------------------
1 file changed, 31 deletions(-)

diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index e32206e..9a9e588 100644
--- 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

-#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 */