linux-kernel - [PATCH] x86/asm/entry/64: Minor cleanup of conditional compilation

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Date:	Sat,  5 Sep 2015 23:37:37 +0300
From:	Nikolay Borisov <nikolay.b.borisov@...il.com>
To:	mingo@...nel.org
Cc:	hpa@...or.com, dvlasenk@...hat.com, luto@...capital.net,
	linux-kernel@...r.kernel.org, bp@...e.de,
	Nikolay Borisov <nikolay.b.borisov@...il.com>
Subject: [PATCH] x86/asm/entry/64: Minor cleanup of conditional compilation

The entry_SYSCALL_64_fastpath was checking the value of __SYSCALL_MASK,
which in turn was being set in arch/x86/include/asm/unistd.h depending on
whether CONFIG_X86_X32_ABI was set or not. This made the intention a bit
cryptic.

Juggle the code around so that the conditional compilation depends on
the value of CONFIG_X86_X32_ABI
---
 arch/x86/entry/entry_64.S | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 8cb3e43..b0177f9 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -175,11 +175,11 @@ GLOBAL(entry_SYSCALL_64_after_swapgs)
 	testl	$_TIF_WORK_SYSCALL_ENTRY, ASM_THREAD_INFO(TI_flags, %rsp, SIZEOF_PTREGS)
 	jnz	tracesys
 entry_SYSCALL_64_fastpath:
-#if __SYSCALL_MASK == ~0
-	cmpq	$__NR_syscall_max, %rax
-#else
+#ifdef CONFIG_X86_X32_ABI
 	andl	$__SYSCALL_MASK, %eax
 	cmpl	$__NR_syscall_max, %eax
+#else
+	cmpq	$__NR_syscall_max, %rax
 #endif
 	ja	1f				/* return -ENOSYS (already in pt_regs->ax) */
 	movq	%r10, %rcx
-- 
2.1.4

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