x86: Merge sys_iopl

Change 32-bit sys_iopl to PTREGSCALL1, and merge with 64-bit.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
LKML-Reference: <1260403316-5679-3-git-send-email-brgerst@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

2 files changed, 6 insertions, 24 deletions

diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 34dbfa909dd7..ab7fcef37453 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -758,7 +758,7 @@ ptregs_##name: \
         addl $4,%esp; \
         ret
 
-PTREGSCALL0(iopl)
+PTREGSCALL1(iopl)
 PTREGSCALL0(fork)
 PTREGSCALL0(clone)
 PTREGSCALL0(vfork)
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 99c4d308f16b..85ecc7c57ba6 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -103,9 +103,10 @@ asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
  * on system-call entry - see also fork() and the signal handling
  * code.
  */
-static int do_iopl(unsigned int level, struct pt_regs *regs)
+long sys_iopl(unsigned int level, struct pt_regs *regs)
 {
         unsigned int old = (regs->flags >> 12) & 3;
+        struct thread_struct *t = &current->thread;
 
         if (level > 3)
                 return -EINVAL;
@@ -115,29 +116,10 @@ static int do_iopl(unsigned int level, struct pt_regs *regs)
                         return -EPERM;
         }
         regs->flags = (regs->flags & ~X86_EFLAGS_IOPL) | (level << 12);
-
-        return 0;
-}
-
 #ifdef CONFIG_X86_32
-long sys_iopl(struct pt_regs *regs)
-{
-        unsigned int level = regs->bx;
-        struct thread_struct *t = &current->thread;
-        int rc;
-
-        rc = do_iopl(level, regs);
-        if (rc < 0)
-                goto out;
-
         t->iopl = level << 12;
         set_iopl_mask(t->iopl);
-out:
-        return rc;
-}
-#else
-asmlinkage long sys_iopl(unsigned int level, struct pt_regs *regs)
-{
-        return do_iopl(level, regs);
-}
 #endif
+
+        return 0;
+}