MIPS: Wire up the restartable sequences (rseq) syscall

Wire up the restartable sequences (rseq) syscall for MIPS. This was
introduced by commit d7822b1e24f2 ("rseq: Introduce restartable
sequences system call") & MIPS now supports the prerequisites.

Signed-off-by: Paul Burton <paul.burton@mips.com>
Reviewed-by: James Hogan <jhogan@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19525/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org

5 files changed, 13 insertions, 6 deletions

diff --git a/arch/mips/include/uapi/asm/unistd.h b/arch/mips/include/uapi/asm/unistd.h
index bb05e9916a5f..170bf0b5b250 100644
--- a/arch/mips/include/uapi/asm/unistd.h
+++ b/arch/mips/include/uapi/asm/unistd.h
@@ -388,17 +388,18 @@
 #define __NR_pkey_alloc                 (__NR_Linux + 364)
 #define __NR_pkey_free                  (__NR_Linux + 365)
 #define __NR_statx                      (__NR_Linux + 366)
+#define __NR_rseq                       (__NR_Linux + 367)
 
 
 /*
  * Offset of the last Linux o32 flavoured syscall
  */
-#define __NR_Linux_syscalls             366
+#define __NR_Linux_syscalls             367
 
 #endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
 
 #define __NR_O32_Linux                  4000
-#define __NR_O32_Linux_syscalls         366
+#define __NR_O32_Linux_syscalls         367
 
 #if _MIPS_SIM == _MIPS_SIM_ABI64
 
@@ -733,16 +734,17 @@
 #define __NR_pkey_alloc                 (__NR_Linux + 324)
 #define __NR_pkey_free                  (__NR_Linux + 325)
 #define __NR_statx                      (__NR_Linux + 326)
+#define __NR_rseq                       (__NR_Linux + 327)
 
 /*
  * Offset of the last Linux 64-bit flavoured syscall
  */
-#define __NR_Linux_syscalls             326
+#define __NR_Linux_syscalls             327
 
 #endif /* _MIPS_SIM == _MIPS_SIM_ABI64 */
 
 #define __NR_64_Linux                   5000
-#define __NR_64_Linux_syscalls          326
+#define __NR_64_Linux_syscalls          327
 
 #if _MIPS_SIM == _MIPS_SIM_NABI32
 
@@ -1081,15 +1083,16 @@
 #define __NR_pkey_alloc                 (__NR_Linux + 328)
 #define __NR_pkey_free                  (__NR_Linux + 329)
 #define __NR_statx                      (__NR_Linux + 330)
+#define __NR_rseq                       (__NR_Linux + 331)
 
 /*
  * Offset of the last N32 flavoured syscall
  */
-#define __NR_Linux_syscalls             330
+#define __NR_Linux_syscalls             331
 
 #endif /* _MIPS_SIM == _MIPS_SIM_NABI32 */
 
 #define __NR_N32_Linux                  6000
-#define __NR_N32_Linux_syscalls         330
+#define __NR_N32_Linux_syscalls         331
 
 #endif /* _UAPI_ASM_UNISTD_H */
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index a9a7d78803cd..842ff1612893 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -590,3 +590,4 @@ EXPORT(sys_call_table)
         PTR     sys_pkey_alloc
         PTR     sys_pkey_free                   /* 4365 */
         PTR     sys_statx
+        PTR     sys_rseq
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index 65d5aeeb9bdb..558830d1e5ba 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -439,4 +439,5 @@ EXPORT(sys_call_table)
         PTR     sys_pkey_alloc
         PTR     sys_pkey_free                   /* 5325 */
         PTR     sys_statx
+        PTR     sys_rseq
         .size   sys_call_table,.-sys_call_table
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index cbf190ef9e8a..293f0b0119f3 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -434,4 +434,5 @@ EXPORT(sysn32_call_table)
         PTR     sys_pkey_alloc
         PTR     sys_pkey_free
         PTR     sys_statx                       /* 6330 */
+        PTR     sys_rseq
         .size   sysn32_call_table,.-sysn32_call_table
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 9ebe3e2403b1..f13a08de8078 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -583,4 +583,5 @@ EXPORT(sys32_call_table)
         PTR     sys_pkey_alloc
         PTR     sys_pkey_free                   /* 4365 */
         PTR     sys_statx
+        PTR     sys_rseq
         .size   sys32_call_table,.-sys32_call_table