[PATCH linux-next v8 1/7] nds32: fix asm/syscall.h

[Dmitry V. Levin]

All syscall_get_*() and syscall_set_*() functions must be defined
as static inline as on all other architectures, otherwise asm/syscall.h
cannot be included in more than one compilation unit.

This bug has to be fixed in order to extend the generic
ptrace API with PTRACE_GET_SYSCALL_INFO request.

Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Fixes: 1932fbe36e02 ("nds32: System calls handling")
Cc: Greentime Hu <green.hu@xxxxxxxxx>
Cc: Vincent Chen <deanbo422@xxxxxxxxx>
Cc: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Eugene Syromyatnikov <esyr@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.17+
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>
---

Notes:
    v8: unchanged
    v7: initial revision

 arch/nds32/include/asm/syscall.h | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/arch/nds32/include/asm/syscall.h b/arch/nds32/include/asm/syscall.h
index 7501e376a6b1..c2d0d31e4009 100644
--- a/arch/nds32/include/asm/syscall.h
+++ b/arch/nds32/include/asm/syscall.h
@@ -26,7 +26,8 @@ struct pt_regs;
  *
  * It's only valid to call this when @task is known to be blocked.
  */
-int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+static inline int
+syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 {
 	return regs->syscallno;
 }
@@ -47,7 +48,8 @@ int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
  * system call instruction.  This may not be the same as what the
  * register state looked like at system call entry tracing.
  */
-void syscall_rollback(struct task_struct *task, struct pt_regs *regs)
+static inline void
+syscall_rollback(struct task_struct *task, struct pt_regs *regs)
 {
 	regs->uregs[0] = regs->orig_r0;
 }
@@ -62,7 +64,8 @@ void syscall_rollback(struct task_struct *task, struct pt_regs *regs)
  * It's only valid to call this when @task is stopped for tracing on exit
  * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
  */
-long syscall_get_error(struct task_struct *task, struct pt_regs *regs)
+static inline long
+syscall_get_error(struct task_struct *task, struct pt_regs *regs)
 {
 	unsigned long error = regs->uregs[0];
 	return IS_ERR_VALUE(error) ? error : 0;
@@ -79,7 +82,8 @@ long syscall_get_error(struct task_struct *task, struct pt_regs *regs)
  * It's only valid to call this when @task is stopped for tracing on exit
  * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
  */
-long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
+static inline long
+syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
 {
 	return regs->uregs[0];
 }
@@ -99,8 +103,9 @@ long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs)
  * It's only valid to call this when @task is stopped for tracing on exit
  * from a system call, due to %TIF_SYSCALL_TRACE or %TIF_SYSCALL_AUDIT.
  */
-void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
-			      int error, long val)
+static inline void
+syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
+			 int error, long val)
 {
 	regs->uregs[0] = (long)error ? error : val;
 }
@@ -123,8 +128,9 @@ void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
  * taking up to 6 arguments.
  */
 #define SYSCALL_MAX_ARGS 6
-void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
-			   unsigned int i, unsigned int n, unsigned long *args)
+static inline void
+syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
+		      unsigned int i, unsigned int n, unsigned long *args)
 {
 	if (n == 0)
 		return;
@@ -164,9 +170,10 @@ void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
  * It's invalid to call this with @i + @n > 6; we only support system calls
  * taking up to 6 arguments.
  */
-void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
-			   unsigned int i, unsigned int n,
-			   const unsigned long *args)
+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+		      unsigned int i, unsigned int n,
+		      const unsigned long *args)
 {
 	if (n == 0)
 		return;
-- 
ldv