introduce generic sys_sigaltstack(), switch x86 and um to it

Conditional on CONFIG_GENERIC_SIGALTSTACK; architectures that do not
select it are completely unaffected

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 2 insertions, 2 deletions

diff --git a/arch/x86/syscalls/syscall_32.tbl b/arch/x86/syscalls/syscall_32.tbl
index ee3c220ee500..62c7b222e45c 100644
--- a/arch/x86/syscalls/syscall_32.tbl
+++ b/arch/x86/syscalls/syscall_32.tbl
@@ -192,7 +192,7 @@
 183     i386    getcwd                  sys_getcwd
 184     i386    capget                  sys_capget
 185     i386    capset                  sys_capset
-186     i386    sigaltstack             ptregs_sigaltstack              stub32_sigaltstack
+186     i386    sigaltstack             sys_sigaltstack                 stub32_sigaltstack
 187     i386    sendfile                sys_sendfile                    sys32_sendfile
 188     i386    getpmsg
 189     i386    putpmsg
diff --git a/arch/x86/syscalls/syscall_64.tbl b/arch/x86/syscalls/syscall_64.tbl
index a582bfed95bb..6ffa7f9d005e 100644
--- a/arch/x86/syscalls/syscall_64.tbl
+++ b/arch/x86/syscalls/syscall_64.tbl
@@ -137,7 +137,7 @@
 128     64      rt_sigtimedwait         sys_rt_sigtimedwait
 129     64      rt_sigqueueinfo         sys_rt_sigqueueinfo
 130     common  rt_sigsuspend           sys_rt_sigsuspend
-131     64      sigaltstack             stub_sigaltstack
+131     64      sigaltstack             sys_sigaltstack
 132     common  utime                   sys_utime
 133     common  mknod                   sys_mknod
 134     64      uselib