linux-kernel - [PATCH v4 06/10] x86: process: Introduce helper to clear a thread's IO bitmap

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Date:	Sun, 2 Nov 2014 09:32:34 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Subject: [PATCH v4 06/10] x86: process: Introduce helper to clear a thread's
 IO bitmap

This will make it easier to make the io_bitmap_ptr field optional later.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 arch/x86/kernel/process-io.h | 5 +++++
 arch/x86/kernel/process_32.c | 4 ++--
 arch/x86/kernel/process_64.c | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/process-io.h b/arch/x86/kernel/process-io.h
index d884444..ffa65e8 100644
--- a/arch/x86/kernel/process-io.h
+++ b/arch/x86/kernel/process-io.h
@@ -1,6 +1,11 @@
 #ifndef _X86_KERNEL_PROCESS_IO_H
 #define _X86_KERNEL_PROCESS_IO_H
 
+static inline void clear_thread_io_bitmap(struct task_struct *p)
+{
+	p->thread.io_bitmap_ptr = NULL;
+}
+
 static inline int copy_io_bitmap(struct task_struct *me,
 				 struct task_struct *p)
 {
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 07550ff..b55f78e 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -154,7 +154,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 		childregs->orig_ax = -1;
 		childregs->cs = __KERNEL_CS | get_kernel_rpl();
 		childregs->flags = X86_EFLAGS_IF | X86_EFLAGS_FIXED;
-		p->thread.io_bitmap_ptr = NULL;
+		clear_thread_io_bitmap(p);
 		return 0;
 	}
 	*childregs = *current_pt_regs();
@@ -165,7 +165,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	p->thread.ip = (unsigned long) ret_from_fork;
 	task_user_gs(p) = get_user_gs(current_pt_regs());
 
-	p->thread.io_bitmap_ptr = NULL;
+	clear_thread_io_bitmap(p);
 	tsk = current;
 
 	/*
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index b1babb4..d18f3fc 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -164,7 +164,7 @@ int copy_thread(unsigned long clone_flags, unsigned long sp,
 	p->thread.sp = (unsigned long) childregs;
 	p->thread.usersp = me->thread.usersp;
 	set_tsk_thread_flag(p, TIF_FORK);
-	p->thread.io_bitmap_ptr = NULL;
+	clear_thread_io_bitmap(p);
 
 	savesegment(gs, p->thread.gsindex);
 	p->thread.gs = p->thread.gsindex ? 0 : me->thread.gs;
-- 
2.1.1

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