[tip:x86/asm] x86/asm: Don't use the confusing '.ifeq' directive

tip-bot for Josh Poimboeuf
2017-10-23T12:48:24Z

Commit-ID: 82c62fa0c49aa305104013cee4468772799bb391
Gitweb: https://git.kernel.org/tip/82c62fa0c49aa305104013cee4468772799bb391
Author: Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate: Fri, 20 Oct 2017 11:21:35 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 23 Oct 2017 13:31:34 +0200

x86/asm: Don't use the confusing '.ifeq' directive

I find the '.ifeq <expression>' directive to be confusing. Reading it
quickly seems to suggest its opposite meaning, or that it's missing an
argument.

Improve readability by replacing all of its x86 uses with
'.if <expression> == 0'.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrei Vagin <avagin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
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/757da028e802c7e98d23fbab8d234b1063e161cf.1508516398.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/entry/entry_64.S | 2 +-
arch/x86/kernel/head_32.S | 2 +-
arch/x86/kernel/head_64.S | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index f6cdb7a..846e84a 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -817,7 +817,7 @@ ENTRY(\sym)

ASM_CLAC

- .ifeq \has_error_code
+ .if \has_error_code == 0
pushq $-1 /* ORIG_RAX: no syscall to restart */
.endif

diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 9ed3074..6e50f87 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -401,7 +401,7 @@ ENTRY(early_idt_handler_array)
# 24(%rsp) error code
i = 0
.rept NUM_EXCEPTION_VECTORS
- .ifeq (EXCEPTION_ERRCODE_MASK >> i) & 1
+ .if ((EXCEPTION_ERRCODE_MASK >> i) & 1) == 0
pushl $0 # Dummy error code, to make stack frame uniform
.endif
pushl $i # 20(%esp) Vector number
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 42e32c2..311db1a 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -273,7 +273,7 @@ ENDPROC(start_cpu0)
ENTRY(early_idt_handler_array)
i = 0
.rept NUM_EXCEPTION_VECTORS
- .ifeq (EXCEPTION_ERRCODE_MASK >> i) & 1
+ .if ((EXCEPTION_ERRCODE_MASK >> i) & 1) == 0
UNWIND_HINT_IRET_REGS
pushq $0 # Dummy error code, to make stack frame uniform
.else