Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Pull signal handling cleanups from Al Viro:
 "This is the first pile; another one will come a bit later and will
  contain SYSCALL_DEFINE-related patches.

   - a bunch of signal-related syscalls (both native and compat)
     unified.

   - a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE
     (fixing several potential problems with missing argument
     validation, while we are at it)

   - a lot of now-pointless wrappers killed

   - a couple of architectures (cris and hexagon) forgot to save
     altstack settings into sigframe, even though they used the
     (uninitialized) values in sigreturn; fixed.

   - microblaze fixes for delivery of multiple signals arriving at once

   - saner set of helpers for signal delivery introduced, several
     architectures switched to using those."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits)
  x86: convert to ksignal
  sparc: convert to ksignal
  arm: switch to struct ksignal * passing
  alpha: pass k_sigaction and siginfo_t using ksignal pointer
  burying unused conditionals
  make do_sigaltstack() static
  arm64: switch to generic old sigaction() (compat-only)
  arm64: switch to generic compat rt_sigaction()
  arm64: switch compat to generic old sigsuspend
  arm64: switch to generic compat rt_sigqueueinfo()
  arm64: switch to generic compat rt_sigpending()
  arm64: switch to generic compat rt_sigprocmask()
  arm64: switch to generic sigaltstack
  sparc: switch to generic old sigsuspend
  sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE
  sparc: kill sign-extending wrappers for native syscalls
  kill sparc32_open()
  sparc: switch to use of generic old sigaction
  sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE
  mips: switch to generic sys_fork() and sys_clone()
  ...

5 files changed, 4 insertions, 36 deletions

diff --git a/arch/xtensa/include/asm/signal.h b/arch/xtensa/include/asm/signal.h
index 6f586bd90e18..de169b4eaeef 100644
--- a/arch/xtensa/include/asm/signal.h
+++ b/arch/xtensa/include/asm/signal.h
@@ -15,16 +15,7 @@
 #include <uapi/asm/signal.h>
 
 #ifndef __ASSEMBLY__
-struct sigaction {
-        __sighandler_t sa_handler;
-        unsigned long sa_flags;
-        void (*sa_restorer)(void);
-        sigset_t sa_mask;               /* mask last for extensibility */
-};
-
-struct k_sigaction {
-        struct sigaction sa;
-};
+#define __ARCH_HAS_SA_RESTORER
 
 #include <asm/sigcontext.h>
 
diff --git a/arch/xtensa/include/asm/syscall.h b/arch/xtensa/include/asm/syscall.h
index 8d5e47fad095..3673ff1f1bc5 100644
--- a/arch/xtensa/include/asm/syscall.h
+++ b/arch/xtensa/include/asm/syscall.h
@@ -9,15 +9,9 @@
  */
 
 struct pt_regs;
-struct sigaction;
 asmlinkage long xtensa_ptrace(long, long, long, long);
 asmlinkage long xtensa_sigreturn(struct pt_regs*);
 asmlinkage long xtensa_rt_sigreturn(struct pt_regs*);
-asmlinkage long xtensa_sigaltstack(struct pt_regs *regs);
-asmlinkage long sys_rt_sigaction(int,
-                                 const struct sigaction __user *,
-                                 struct sigaction __user *,
-                                 size_t);
 asmlinkage long xtensa_shmat(int, char __user *, int);
 asmlinkage long xtensa_fadvise64_64(int, int,
                                     unsigned long long, unsigned long long);
@@ -31,4 +25,3 @@ asmlinkage long sys_ppoll(struct pollfd __user *ufds, unsigned int nfds,
                           struct timespec __user *tsp,
                           const sigset_t __user *sigmask,
                           size_t sigsetsize);
-asmlinkage long sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize);
diff --git a/arch/xtensa/include/asm/unistd.h b/arch/xtensa/include/asm/unistd.h
index eb63ea87815c..c38834de9ac7 100644
--- a/arch/xtensa/include/asm/unistd.h
+++ b/arch/xtensa/include/asm/unistd.h
@@ -15,8 +15,6 @@
 #define __ARCH_WANT_STAT64
 #define __ARCH_WANT_SYS_UTIME
 #define __ARCH_WANT_SYS_LLSEEK
-#define __ARCH_WANT_SYS_RT_SIGACTION
-#define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_GETPGRP
 
 /* 
diff --git a/arch/xtensa/include/uapi/asm/unistd.h b/arch/xtensa/include/uapi/asm/unistd.h
index 5162418c5d90..19fac3f543a2 100644
--- a/arch/xtensa/include/uapi/asm/unistd.h
+++ b/arch/xtensa/include/uapi/asm/unistd.h
@@ -483,7 +483,7 @@ __SYSCALL(222, sys_ni_syscall, 0)
 #define __NR_restart_syscall                    223
 __SYSCALL(223, sys_restart_syscall, 0)
 #define __NR_sigaltstack                        224
-__SYSCALL(224, xtensa_sigaltstack, 2)
+__SYSCALL(224, sys_sigaltstack, 2)
 #define __NR_rt_sigreturn                       225
 __SYSCALL(225, xtensa_rt_sigreturn, 1)
 #define __NR_rt_sigaction                       226
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index de34d6be91cd..d7590dddd084 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -265,7 +265,7 @@ asmlinkage long xtensa_rt_sigreturn(long a0, long a1, long a2, long a3,
 
         ret = regs->areg[2];
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->areg[1]) == -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return ret;
@@ -368,11 +368,7 @@ static int setup_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 
         err |= __put_user(0, &frame->uc.uc_flags);
         err |= __put_user(0, &frame->uc.uc_link);
-        err |= __put_user((void *)current->sas_ss_sp,
-                          &frame->uc.uc_stack.ss_sp);
-        err |= __put_user(sas_ss_flags(regs->areg[1]),
-                          &frame->uc.uc_stack.ss_flags);
-        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= __save_altstack(&frame->uc.uc_stack, regs->areg[1]);
         err |= setup_sigcontext(frame, regs);
         err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 
@@ -424,16 +420,6 @@ give_sigsegv:
         return -EFAULT;
 }
 
-asmlinkage long xtensa_sigaltstack(const stack_t __user *uss,
-                                   stack_t __user *uoss,
-                                   long a2, long a3, long a4, long a5,
-                                   struct pt_regs *regs)
-{
-        return do_sigaltstack(uss, uoss, regs->areg[1]);
-}
-
-
-
 /*
  * Note that 'init' is a special process: it doesn't get signals it doesn't
  * want to handle. Thus you cannot kill init even with a SIGKILL even by