linux-kernel - [PATCH 03/27] x86: remove TRAP

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Date:	Sun, 25 Nov 2007 13:58:48 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 03/27] x86: remove TRAP_FLAG


This gets rid of the local constant macro TRAP_FLAG.
It's redundant with the public constant macro X86_EFLAGS_TF.

Signed-off-by: Roland McGrath <roland@...hat.com>
---
 arch/x86/kernel/ptrace_32.c |    9 +++------
 arch/x86/kernel/ptrace_64.c |    9 +++------
 2 files changed, 6 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/ptrace_32.c b/arch/x86/kernel/ptrace_32.c
index 39a94a0..2b4fcb5 100644
--- a/arch/x86/kernel/ptrace_32.c
+++ b/arch/x86/kernel/ptrace_32.c
@@ -37,9 +37,6 @@
  */
 #define FLAG_MASK 0x00050dd5
 
-/* set's the trap flag. */
-#define TRAP_FLAG 0x100
-
 /*
  * Offset of eflags on child stack..
  */
@@ -235,11 +232,11 @@ static void set_singlestep(struct task_struct *child)
 	/*
 	 * If TF was already set, don't do anything else
 	 */
-	if (regs->eflags & TRAP_FLAG)
+	if (regs->eflags & X86_EFLAGS_TF)
 		return;
 
 	/* Set TF on the kernel stack.. */
-	regs->eflags |= TRAP_FLAG;
+	regs->eflags |= X86_EFLAGS_TF;
 
 	/*
 	 * ..but if TF is changed by the instruction we will trace,
@@ -260,7 +257,7 @@ static void clear_singlestep(struct task_struct *child)
 	/* But touch TF only if it was set by us.. */
 	if (child->ptrace & PT_DTRACE) {
 		struct pt_regs *regs = get_child_regs(child);
-		regs->eflags &= ~TRAP_FLAG;
+		regs->eflags &= ~X86_EFLAGS_TF;
 		child->ptrace &= ~PT_DTRACE;
 	}
 }
diff --git a/arch/x86/kernel/ptrace_64.c b/arch/x86/kernel/ptrace_64.c
index 07de75d..e907e2e 100644
--- a/arch/x86/kernel/ptrace_64.c
+++ b/arch/x86/kernel/ptrace_64.c
@@ -42,9 +42,6 @@
  */
 #define FLAG_MASK 0x54dd5UL
 
-/* set's the trap flag. */
-#define TRAP_FLAG 0x100UL
-
 /*
  * eflags and offset of eflags on child stack..
  */
@@ -187,11 +184,11 @@ static void set_singlestep(struct task_struct *child)
 	/*
 	 * If TF was already set, don't do anything else
 	 */
-	if (regs->eflags & TRAP_FLAG)
+	if (regs->eflags & X86_EFLAGS_TF)
 		return;
 
 	/* Set TF on the kernel stack.. */
-	regs->eflags |= TRAP_FLAG;
+	regs->eflags |= X86_EFLAGS_TF;
 
 	/*
 	 * ..but if TF is changed by the instruction we will trace,
@@ -212,7 +209,7 @@ static void clear_singlestep(struct task_struct *child)
 	/* But touch TF only if it was set by us.. */
 	if (child->ptrace & PT_DTRACE) {
 		struct pt_regs *regs = task_pt_regs(child);
-		regs->eflags &= ~TRAP_FLAG;
+		regs->eflags &= ~X86_EFLAGS_TF;
 		child->ptrace &= ~PT_DTRACE;
 	}
 }
-
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