[PATCH v11 3/7] mips: define syscall_get_error()

From: Dmitry V. Levin
Date: Fri May 10 2019 - 11:29:36 EST

syscall_get_error() is required to be implemented on all
architectures in addition to already implemented syscall_get_nr(),
syscall_get_arguments(), syscall_get_return_value(), and
syscall_get_arch() functions in order to extend the generic
ptrace API with PTRACE_GET_SYSCALL_INFO request.

Acked-by: Paul Burton <paul.burton@xxxxxxxx>
Cc: Elvira Khabirova <lineprinter@xxxxxxxxxxxx>
Cc: Eugene Syromyatnikov <esyr@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: James Hogan <jhogan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Signed-off-by: Dmitry V. Levin <ldv@xxxxxxxxxxxx>

v11: unchanged
v10: unchanged
v9: unchanged
v8: unchanged
v7: added Acked-by from https://lore.kernel.org/lkml/20181213190015.olf6vhuimjl4jixs@pburton-laptop/
v6: unchanged
v5: initial revision

arch/mips/include/asm/syscall.h | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/mips/include/asm/syscall.h b/arch/mips/include/asm/syscall.h
index acf80ae0a430..83bb439597d8 100644
--- a/arch/mips/include/asm/syscall.h
+++ b/arch/mips/include/asm/syscall.h
@@ -89,6 +89,12 @@ static inline unsigned long mips_get_syscall_arg(unsigned long *arg,

+static inline long syscall_get_error(struct task_struct *task,
+ struct pt_regs *regs)
+ return regs->regs[7] ? -regs->regs[2] : 0;
static inline long syscall_get_return_value(struct task_struct *task,
struct pt_regs *regs)