[Xen-devel] [PATCH 15/16] x86: don't need "changed" parameter for set_io_bitmap()

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

From: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

The "changed" parameter isn't really used, so don't bother passing it.
(xen_set_io_bitmap can keep track of it for itself, if it wants.)

[ Impact: cleanup ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
---
 arch/x86/include/asm/paravirt.h  |    6 +++---
 arch/x86/include/asm/processor.h |    2 +-
 arch/x86/kernel/ioport.c         |    9 +++------
 arch/x86/kernel/process.c        |    4 ++--
 arch/x86/xen/enlighten.c         |    5 +----
 5 files changed, 10 insertions(+), 16 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 8b02fd0..c7136e8 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -157,7 +157,7 @@ struct pv_cpu_ops {
 
        void (*set_iopl_mask)(unsigned mask);
        void (*set_io_bitmap)(struct thread_struct *thread,
-                             int changed, unsigned long bytes_updated);
+                             unsigned long bytes_updated);
 
        void (*wbinvd)(void);
        void (*io_delay)(void);
@@ -1005,9 +1005,9 @@ static inline void set_iopl_mask(unsigned mask)
 }
 
 static inline void set_io_bitmap(struct thread_struct *thread,
-                                 int changed, unsigned long bytes_updated)
+                                unsigned long bytes_updated)
 {
-       PVOP_VCALL3(pv_cpu_ops.set_io_bitmap, thread, changed, bytes_updated);
+       PVOP_VCALL2(pv_cpu_ops.set_io_bitmap, thread, bytes_updated);
 }
 
 /* The paravirtualized I/O functions */
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 1c70563..ed0e363 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -545,7 +545,7 @@ static inline void native_set_iopl_mask(unsigned mask)
 }
 
 extern void native_set_io_bitmap(struct thread_struct *thread,
-                                int changed, unsigned long updated_bytes);
+                                unsigned long updated_bytes);
 
 static inline void
 native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index b5c1918..0a421d3 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -31,7 +31,7 @@ static void set_bitmap(unsigned long *bitmap, unsigned int 
base,
 }
 
 void native_set_io_bitmap(struct thread_struct *t,
-                         int changed, unsigned long bytes_updated)
+                         unsigned long bytes_updated)
 {
        struct tss_struct *tss;
 
@@ -54,7 +54,6 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long 
num, int turn_on)
 {
        struct thread_struct *t = &current->thread;
        unsigned int i, max_long, bytes, bytes_updated;
-       int changed;
 
        if ((from + num <= from) || (from + num > IO_BITMAP_BITS))
                return -EINVAL;
@@ -75,9 +74,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long 
num, int turn_on)
                memset(bitmap, 0xff, IO_BITMAP_BYTES);
                t->io_bitmap_ptr = bitmap;
                set_thread_flag(TIF_IO_BITMAP);
-               changed = 1;
-       } else
-               changed = 0;
+       }
 
        /*
         * do it in the per-thread copy
@@ -104,7 +101,7 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned 
long num, int turn_on)
 
        t->io_bitmap_max = bytes;
 
-       set_io_bitmap(t, changed, bytes_updated);
+       set_io_bitmap(t, bytes_updated);
 
        preempt_enable();
 
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 0c1a4fb..a520f7a 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -74,7 +74,7 @@ void exit_thread(void)
                preempt_disable();
                t->io_bitmap_ptr = NULL;
                clear_thread_flag(TIF_IO_BITMAP);
-               set_io_bitmap(t, 1, t->io_bitmap_max);
+               set_io_bitmap(t, t->io_bitmap_max);
                t->io_bitmap_max = 0;
                preempt_enable();
                kfree(bp);
@@ -209,7 +209,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct 
task_struct *next_p,
 
        if (test_tsk_thread_flag(next_p, TIF_IO_BITMAP) ||
            test_tsk_thread_flag(prev_p, TIF_IO_BITMAP))
-               set_io_bitmap(next, 1,
+               set_io_bitmap(next,
                              max(prev->io_bitmap_max, next->io_bitmap_max));
 }
 
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 3317c91..12e4d9c 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -606,13 +606,10 @@ static void xen_set_iopl_mask(unsigned mask)
 }
 
 static void xen_set_io_bitmap(struct thread_struct *thread,
-                             int changed, unsigned long bytes_updated)
+                             unsigned long bytes_updated)
 {
        struct physdev_set_iobitmap set_iobitmap;
 
-       if (!changed)
-               return;
-
        set_xen_guest_handle(set_iobitmap.bitmap,
                             (char *)thread->io_bitmap_ptr);
        set_iobitmap.nr_ports = thread->io_bitmap_ptr ? IO_BITMAP_BITS : 0;
-- 
1.6.0.6


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