[PATCH] Sanitise handling of unneeded syscall stubs

From: David Mosberger <davidm@napali.hpl.hp.com>

Below is a patch that tries to sanitize the dropping of unneeded system-call
stubs in generic code.  In some instances, it would be possible to move the
optional system-call stubs into a library routine which would avoid the need
for #ifdefs, but in many cases, doing so would require making several
functions global (and possibly exporting additional data-structures in
header-files).  Furthermore, it would inhibit (automatic) inlining in the
cases in the cases where the stubs are needed.  For these reasons, the patch
keeps the #ifdef-approach.

This has been tested on ia64 and there were no objections from the
arch-maintainers (and one positive response).  The patch should be safe but
arch-maintainers may want to take a second look to see if some __ARCH_WANT_foo
macros should be removed for their architecture (I'm quite sure that's the
case, but I wanted to play it safe and only preserved the status-quo in that
regard).

fs/namespace.c

@@ -22,6 +22,7 @@
 #include <linux/security.h>
 #include <linux/mount.h>
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 extern int __init init_rootfs(void);
 
@@ -465,6 +466,8 @@ asmlinkage long sys_umount(char __user * name, int flags)
 	return retval;
 }
 
+#ifdef __ARCH_WANT_SYS_OLDUMOUNT
+
 /*
  *	The 2.0 compatible umount. No flags. 
  */
@@ -474,6 +477,8 @@ asmlinkage long sys_oldumount(char __user * name)
 	return sys_umount(name,0);
 }
 
+#endif
+
 static int mount_is_safe(struct nameidata *nd)
 {
 	if (capable(CAP_SYS_ADMIN))

fs/open.c

@@ -23,6 +23,8 @@
 #include <linux/fs.h>
 #include <linux/pagemap.h>
 
+#include <asm/unistd.h>
+
 int vfs_statfs(struct super_block *sb, struct kstatfs *buf)
 {
 	int retval = -ENODEV;
@@ -335,7 +337,7 @@ asmlinkage long sys_ftruncate64(unsigned int fd, loff_t length)
 }
 #endif
 
-#if !(defined(__alpha__) || defined(__ia64__))
+#ifdef __ARCH_WANT_SYS_UTIME
 
 /*
  * sys_utime() can be implemented in user-level using sys_utimes().

fs/read_write.c

@@ -15,6 +15,7 @@
 #include <linux/module.h>
 
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 struct file_operations generic_ro_fops = {
 	.llseek		= generic_file_llseek,
@@ -145,7 +146,7 @@ asmlinkage off_t sys_lseek(unsigned int fd, off_t offset, unsigned int origin)
 }
 EXPORT_SYMBOL_GPL(sys_lseek);
 
-#if !defined(__alpha__)
+#ifdef __ARCH_WANT_SYS_LLSEEK
 asmlinkage long sys_llseek(unsigned int fd, unsigned long offset_high,
 			   unsigned long offset_low, loff_t __user * result,
 			   unsigned int origin)

fs/readdir.c

@@ -14,6 +14,7 @@
 #include <linux/fs.h>
 #include <linux/dirent.h>
 #include <linux/security.h>
+#include <linux/unistd.h>
 
 #include <asm/uaccess.h>
 
@@ -52,7 +53,7 @@ EXPORT_SYMBOL(vfs_readdir);
 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char *) (de)))
 #define ROUND_UP(x) (((x)+sizeof(long)-1) & ~(sizeof(long)-1))
 
-#ifndef __ia64__
+#ifdef __ARCH_WANT_OLD_READDIR
 
 struct old_linux_dirent {
 	unsigned long	d_ino;
@@ -115,7 +116,7 @@ asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * di
 	return error;
 }
 
-#endif /* !__ia64__ */
+#endif /* __ARCH_WANT_OLD_READDIR */
 
 /*
  * New, all-improved, singing, dancing, iBCS2-compliant getdents()

fs/stat.c

@@ -16,6 +16,7 @@
 #include <linux/security.h>
 
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 void generic_fillattr(struct inode *inode, struct kstat *stat)
 {
@@ -105,10 +106,7 @@ int vfs_fstat(unsigned int fd, struct kstat *stat)
 
 EXPORT_SYMBOL(vfs_fstat);
 
-#if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) \
-  && !defined(CONFIG_ARCH_S390) && !defined(__hppa__) \
-  && !defined(__arm__) && !defined(CONFIG_V850) && !defined(__powerpc64__) \
-  && !defined(__mips__)
+#ifdef __ARCH_WANT_OLD_STAT
 
 /*
  * For backward compatibility?  Maybe this should be moved
@@ -178,7 +176,7 @@ asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * sta
 	return error;
 }
 
-#endif
+#endif /* __ARCH_WANT_OLD_STAT */
 
 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
 {
@@ -284,7 +282,7 @@ asmlinkage long sys_readlink(const char __user * path, char __user * buf, int bu
 
 
 /* ---------- LFS-64 ----------- */
-#if !defined(__ia64__) && !defined(__mips64) && !defined(__x86_64__) && !defined(CONFIG_ARCH_S390X)
+#ifdef __ARCH_WANT_STAT64
 
 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
 {
@@ -352,7 +350,7 @@ asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
 	return error;
 }
 
-#endif /* LFS-64 */
+#endif /* __ARCH_WANT_STAT64 */
 
 void inode_add_bytes(struct inode *inode, loff_t bytes)
 {

include/asm-alpha/signal.h

@@ -187,7 +187,6 @@ struct sigstack {
 #include <asm/sigcontext.h>
 
 #define ptrace_signal_deliver(regs, cookie) do { } while (0)
-#define HAVE_ARCH_SYS_PAUSE
 
 #endif
 

include/asm-alpha/unistd.h

@@ -558,6 +558,19 @@ type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, type6 arg6)\
 
 #endif /* __LIBRARY__ && __GNUC__ */
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-arm/unistd.h

@@ -448,6 +448,25 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5, type6 arg6
   __syscall_return(type,__res);						\
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-arm26/unistd.h

@@ -375,6 +375,30 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) {			\
   __syscall_return(type,__res);								\
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-cris/unistd.h

@@ -279,7 +279,29 @@
 #define NR_syscalls 270
 
 
-
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
 
 #ifdef __KERNEL_SYSCALLS__
 

include/asm-h8300/unistd.h

@@ -446,6 +446,30 @@ type name(atype a, btype b, ctype c, dtype d, etype e, ftype f)			\
 }
 		
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-i386/unistd.h

@@ -381,6 +381,30 @@ __asm__ volatile ("push %%ebp ; movl %%eax,%%ebp ; movl %1,%%eax ; int $0x80 ; p
 __syscall_return(type,__res); \
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-ia64/signal.h

@@ -176,7 +176,6 @@ struct k_sigaction {
 #  include <asm/sigcontext.h>
 
 #define ptrace_signal_deliver(regs, cookie) do { } while (0)
-#define HAVE_ARCH_SYS_PAUSE
 
 #endif /* __KERNEL__ */
 

include/asm-ia64/unistd.h

@@ -261,8 +261,21 @@
 
 #ifdef __KERNEL__
 
+#include <linux/config.h>
+
 #define NR_syscalls			256 /* length of syscall table */
 
+#ifdef CONFIG_IA32_SUPPORT
+# define __ARCH_WANT_SYS_FADVISE64
+# define __ARCH_WANT_SYS_GETPGRP
+# define __ARCH_WANT_SYS_LLSEEK
+# define __ARCH_WANT_SYS_NICE
+# define __ARCH_WANT_SYS_OLD_GETRLIMIT
+# define __ARCH_WANT_SYS_OLDUMOUNT
+# define __ARCH_WANT_SYS_SIGPENDING
+# define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #if !defined(__ASSEMBLY__) && !defined(ASSEMBLER)
 
 #include <linux/types.h>

include/asm-m68k/unistd.h

@@ -337,6 +337,30 @@ __asm__ __volatile__ ("trap  #0" \
 __syscall_return(type,__res); \
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-m68knommu/unistd.h

@@ -372,6 +372,29 @@ type name(atype a, btype b, ctype c, dtype d, etype e)				\
   return (type)__res;								\
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
 
 #ifdef __KERNEL_SYSCALLS__
 

include/asm-mips/unistd.h

@@ -1072,6 +1072,30 @@ type name (atype a,btype b,ctype c,dtype d,etype e,ftype f) \
 
 #endif /* (_MIPS_SIM == _MIPS_SIM_NABI32) || (_MIPS_SIM == _MIPS_SIM_ABI64) */
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+# ifndef __mips64
+#  define __ARCH_WANT_STAT64
+# endif
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-parisc/unistd.h

@@ -879,6 +879,27 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)	\
     return K_INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5);	\
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
 
 /* mmap & mmap2 take 6 arguments */
 #define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5,type6,arg6) \

include/asm-ppc/unistd.h

@@ -381,6 +381,28 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5)	\
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls
 
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+
 /*
  * Forking from kernel space will result in the child getting a new,
  * empty kernel stack area.  Thus the child cannot access automatic

include/asm-ppc64/unistd.h

@@ -419,6 +419,27 @@ static inline _syscall3(int, execve, __const__ char *, file, char **, argv,
 #include <linux/compiler.h>
 #include <linux/linkage.h>
 
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+
 unsigned long sys_mmap(unsigned long addr, size_t len, unsigned long prot,
 		       unsigned long flags, unsigned long fd, off_t offset);
 struct pt_regs;

include/asm-s390/unistd.h

@@ -512,6 +512,29 @@ type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4,    \
 	__syscall_return(type,__res);			     \
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+# ifndef CONFIG_ARCH_S390X
+#   define __ARCH_WANT_STAT64
+# endif
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/config.h>

include/asm-sh/unistd.h

@@ -400,6 +400,30 @@ __asm__ __volatile__ ("trapa	#0x15" \
 __syscall_return(type,__sc0); \
 }
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-sparc/unistd.h

@@ -431,6 +431,30 @@ if (__res < -255 || __res>=0) \
 errno = -__res; \
 return -1; \
 }
+
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-sparc64/signal.h

@@ -253,8 +253,6 @@ struct signal_deliver_cookie {
 struct pt_regs;
 extern void ptrace_signal_deliver(struct pt_regs *regs, void *cookie);
 
-#define HAVE_ARCH_SYS_PAUSE
-
 #endif /* !(__KERNEL__) */
 
 #endif /* !(__ASSEMBLY__) */

include/asm-sparc64/unistd.h

@@ -474,6 +474,27 @@ asmlinkage long sys_rt_sigaction(int sig,
 #define   _SC_JOB_CONTROL         6
 #define   _SC_SAVED_IDS           7
 #define   _SC_VERSION             8
+
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
 #endif
 
 /*

include/asm-um/unistd.h

@@ -12,6 +12,30 @@
 
 extern int um_execve(const char *file, char *const argv[], char *const env[]);
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-v850/unistd.h

@@ -386,6 +386,30 @@ type name (atype a, btype b, ctype c, dtype d, etype e, ftype f)	      \
 }
 		
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_IPC_PARSE_VERSION
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_STAT64
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifdef __KERNEL_SYSCALLS__
 
 #include <linux/compiler.h>

include/asm-x86_64/unistd.h

@@ -571,6 +571,28 @@ do { \
 	return (type) (res); \
 } while (0)
 
+#ifdef __KERNEL__
+#define __ARCH_WANT_OLD_READDIR
+#define __ARCH_WANT_OLD_STAT
+#define __ARCH_WANT_SYS_ALARM
+#define __ARCH_WANT_SYS_GETHOSTNAME
+#define __ARCH_WANT_SYS_PAUSE
+#define __ARCH_WANT_SYS_SGETMASK
+#define __ARCH_WANT_SYS_SIGNAL
+#define __ARCH_WANT_SYS_TIME
+#define __ARCH_WANT_SYS_UTIME
+#define __ARCH_WANT_SYS_WAITPID
+#define __ARCH_WANT_SYS_SOCKETCALL
+#define __ARCH_WANT_SYS_FADVISE64
+#define __ARCH_WANT_SYS_GETPGRP
+#define __ARCH_WANT_SYS_LLSEEK
+#define __ARCH_WANT_SYS_NICE
+#define __ARCH_WANT_SYS_OLD_GETRLIMIT
+#define __ARCH_WANT_SYS_OLDUMOUNT
+#define __ARCH_WANT_SYS_SIGPENDING
+#define __ARCH_WANT_SYS_SIGPROCMASK
+#endif
+
 #ifndef __KERNEL_SYSCALLS__
 
 #define __syscall "syscall"

ipc/util.c

@@ -25,6 +25,8 @@
 #include <linux/rcupdate.h>
 #include <linux/workqueue.h>
 
+#include <asm/unistd.h>
+
 #include "util.h"
 
 /**
@@ -507,7 +509,8 @@ int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid)
 	return 0;
 }
 
-#if !defined(__ia64__) && !defined(__x86_64__) && !defined(__hppa__)
+#ifdef __ARCH_WANT_IPC_PARSE_VERSION
+
 
 /**
  *	ipc_parse_version	-	IPC call version
@@ -528,4 +531,4 @@ int ipc_parse_version (int *cmd)
 	}
 }
 
-#endif /* __ia64__ */
+#endif /* __ARCH_WANT_IPC_PARSE_VERSION */

kernel/exit.c

@@ -24,6 +24,7 @@
 #include <linux/proc_fs.h>
 
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 #include <asm/pgtable.h>
 #include <asm/mmu_context.h>
 
@@ -1157,8 +1158,7 @@ asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struc
 	return retval;
 }
 
-#if !defined(__alpha__) && !defined(__ia64__) && \
-    !defined(__arm__) && !defined(__s390__)
+#ifdef __ARCH_WANT_SYS_WAITPID
 
 /*
  * sys_waitpid() remains for compatibility. waitpid() should be

kernel/sched.c

@@ -41,6 +41,8 @@
 #include <linux/percpu.h>
 #include <linux/kthread.h>
 
+#include <asm/unistd.h>
+
 #ifdef CONFIG_NUMA
 #define cpu_to_node_mask(cpu) node_to_cpumask(cpu_to_node(cpu))
 #else
@@ -2587,7 +2589,7 @@ void set_user_nice(task_t *p, long nice)
 
 EXPORT_SYMBOL(set_user_nice);
 
-#ifndef __alpha__
+#ifdef __ARCH_WANT_SYS_NICE
 
 /*
  * sys_nice - change the priority of the current process.

kernel/signal.c

@@ -23,6 +23,7 @@
 #include <linux/ptrace.h>
 #include <asm/param.h>
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 #include <asm/siginfo.h>
 
 /*
@@ -2412,14 +2413,19 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
 	return error;
 }
 
+#ifdef __ARCH_WANT_SYS_SIGPENDING
+
 asmlinkage long
 sys_sigpending(old_sigset_t __user *set)
 {
 	return do_sigpending(set, sizeof(*set));
 }
 
-#if !defined(__alpha__)
-/* Alpha has its own versions with special arguments.  */
+#endif
+
+#ifdef __ARCH_WANT_SYS_SIGPROCMASK
+/* Some platforms have their own version with special arguments others
+   support only sys_rt_sigprocmask.  */
 
 asmlinkage long
 sys_sigprocmask(int how, old_sigset_t __user *set, old_sigset_t __user *oset)
@@ -2501,8 +2507,8 @@ sys_rt_sigaction(int sig,
 #endif /* __sparc__ */
 #endif
 
-#if !defined(__alpha__) && !defined(__ia64__) && \
-    !defined(__arm__) && !defined(__s390__)
+#ifdef __ARCH_WANT_SYS_SGETMASK
+
 /*
  * For backwards compatibility.  Functionality superseded by sigprocmask.
  */
@@ -2528,10 +2534,9 @@ sys_ssetmask(int newmask)
 
 	return old;
 }
-#endif /* !defined(__alpha__) */
+#endif /* __ARCH_WANT_SGETMASK */
 
-#if !defined(__alpha__) && !defined(__ia64__) && !defined(__mips__) && \
-    !defined(__arm__)
+#ifdef __ARCH_WANT_SYS_SIGNAL
 /*
  * For backwards compatibility.  Functionality superseded by sigaction.
  */
@@ -2548,9 +2553,9 @@ sys_signal(int sig, __sighandler_t handler)
 
 	return ret ? ret : (unsigned long)old_sa.sa.sa_handler;
 }
-#endif /* !alpha && !__ia64__ && !defined(__mips__) && !defined(__arm__) */
+#endif /* __ARCH_WANT_SYS_SIGNAL */
 
-#ifndef HAVE_ARCH_SYS_PAUSE
+#ifdef __ARCH_WANT_SYS_PAUSE
 
 asmlinkage long
 sys_pause(void)
@@ -2560,7 +2565,7 @@ sys_pause(void)
 	return -ERESTARTNOHAND;
 }
 
-#endif /* HAVE_ARCH_SYS_PAUSE */
+#endif
 
 void __init signals_init(void)
 {

kernel/sys.c

@@ -1060,12 +1060,16 @@ asmlinkage long sys_getpgid(pid_t pid)
 	}
 }
 
+#ifdef __ARCH_WANT_SYS_GETPGRP
+
 asmlinkage long sys_getpgrp(void)
 {
 	/* SMP - assuming writes are word atomic this is fine */
 	return process_group(current);
 }
 
+#endif
+
 asmlinkage long sys_getsid(pid_t pid)
 {
 	if (!pid) {
@@ -1406,6 +1410,8 @@ asmlinkage long sys_sethostname(char __user *name, int len)
 	return errno;
 }
 
+#ifdef __ARCH_WANT_SYS_GETHOSTNAME
+
 asmlinkage long sys_gethostname(char __user *name, int len)
 {
 	int i, errno;
@@ -1423,6 +1429,8 @@ asmlinkage long sys_gethostname(char __user *name, int len)
 	return errno;
 }
 
+#endif
+
 /*
  * Only setdomainname; getdomainname can be implemented by calling
  * uname()
@@ -1457,7 +1465,7 @@ asmlinkage long sys_getrlimit(unsigned int resource, struct rlimit __user *rlim)
 			? -EFAULT : 0;
 }
 
-#if defined(COMPAT_RLIM_OLD_INFINITY) || !(defined(CONFIG_IA64) || defined(CONFIG_V850))
+#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
 
 /*
  *	Back compatibility for getrlimit. Needed for some apps.

kernel/time.c

@@ -29,6 +29,7 @@
 #include <linux/errno.h>
 #include <linux/smp_lock.h>
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 
 /* 
  * The timezone where the local system is located.  Used as a default by some
@@ -38,7 +39,7 @@ struct timezone sys_tz;
 
 EXPORT_SYMBOL(sys_tz);
 
-#if !defined(__alpha__) && !defined(__ia64__)
+#ifdef __ARCH_WANT_SYS_TIME
 
 /*
  * sys_time() can be implemented in user-level using
@@ -84,7 +85,7 @@ asmlinkage long sys_stime(time_t *tptr)
 	return 0;
 }
 
-#endif
+#endif /* __ARCH_WANT_SYS_TIME */
 
 asmlinkage long sys_gettimeofday(struct timeval __user *tv, struct timezone __user *tz)
 {

kernel/timer.c

@@ -33,6 +33,7 @@
 #include <linux/cpu.h>
 
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
 #include <asm/div64.h>
 #include <asm/timex.h>
 
@@ -952,7 +953,7 @@ void do_timer(struct pt_regs *regs)
 	update_times();
 }
 
-#if !defined(__alpha__) && !defined(__ia64__)
+#ifdef __ARCH_WANT_SYS_ALARM
 
 /*
  * For backwards compatibility?  This can be done in libc so Alpha

mm/fadvise.c

@@ -16,6 +16,8 @@
 #include <linux/pagevec.h>
 #include <linux/fadvise.h>
 
+#include <asm/unistd.h>
+
 /*
  * POSIX_FADV_WILLNEED could set PG_Referenced, and POSIX_FADV_NOREUSE could
  * deactivate the pages and clear PG_Referenced.
@@ -98,8 +100,11 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
 	return ret;
 }
 
+#ifdef __ARCH_WANT_SYS_FADVISE64
+
 asmlinkage long sys_fadvise64(int fd, loff_t offset, size_t len, int advice)
 {
 	return sys_fadvise64_64(fd, offset, len, advice);
 }
 
+#endif

net/socket.c

@@ -87,6 +87,8 @@
 #endif	/* CONFIG_NET_RADIO */
 
 #include <asm/uaccess.h>
+#include <asm/unistd.h>
+
 #include <net/compat.h>
 
 #include <net/sock.h>
@@ -1817,6 +1819,8 @@ asmlinkage long sys_recvmsg(int fd, struct msghdr __user *msg, unsigned int flag
 	return err;
 }
 
+#ifdef __ARCH_WANT_SYS_SOCKETCALL
+
 /* Argument list sizes for sys_socketcall */
 #define AL(x) ((x) * sizeof(unsigned long))
 static unsigned char nargs[18]={AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
@@ -1910,6 +1914,8 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
 	return err;
 }
 
+#endif /* __ARCH_WANT_SYS_SOCKETCALL */
+
 /*
  *	This function is called by a protocol handler that wants to
  *	advertise its address family, and have it linked into the