All syscall arguments are passed in as types of the same byte size as
unsigned long (width of full registers). Using a smaller type without a
cast may result in losing bits of information. SYSCALL_DEFINE* introduce
adequate type casts. All definitions of syscalls in x86 except for those
patched here have already been using the appropriate SYSCALL_DEFINE*.

Signed-off-by: Michael Tautschnig <tauts...@amazon.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Jaswinder Singh <jaswin...@infradead.org>
Cc: Andi Kleen <a...@linux.intel.com>
---
 arch/x86/kernel/ioport.c | 3 ++-
 arch/x86/kernel/signal.c | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 2f72330..7db3d65 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -23,7 +23,8 @@
 /*
  * this changes the io permissions bitmap in the current task.
  */
-asmlinkage long sys_ioperm(unsigned long from, unsigned long num, int turn_on)
+SYSCALL_DEFINE3(ioperm, unsigned long, from, unsigned long, num, int,
+               turn_on)
 {
        struct thread_struct *t = &current->thread;
        struct tss_struct *tss;
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index b9e00e8..40ba242 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -25,6 +25,7 @@
 #include <linux/user-return-notifier.h>
 #include <linux/uprobes.h>
 #include <linux/context_tracking.h>
+#include <linux/syscalls.h>

 #include <asm/processor.h>
 #include <asm/ucontext.h>
@@ -601,7 +602,7 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
  * Do a signal return; undo the signal stack.
  */
 #ifdef CONFIG_X86_32
-asmlinkage unsigned long sys_sigreturn(void)
+SYSCALL_DEFINE0(sigreturn)
 {
        struct pt_regs *regs = current_pt_regs();
        struct sigframe __user *frame;
@@ -633,7 +634,7 @@ asmlinkage unsigned long sys_sigreturn(void)
 }
 #endif /* CONFIG_X86_32 */

-asmlinkage long sys_rt_sigreturn(void)
+SYSCALL_DEFINE0(rt_sigreturn)
 {
        struct pt_regs *regs = current_pt_regs();
        struct rt_sigframe __user *frame;
--
2.7.3.AMZN



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