[PATCH] tiny: Make *[ug]id16 support optional

Configurable 16-bit UID and friends support

This allows turning off the legacy 16 bit UID interfaces on embedded platforms.

   text    data     bss     dec     hex filename
3330172  529036  190556 4049764  3dcb64 vmlinux-baseline
3328268  529040  190556 4047864  3dc3f8 vmlinux

From: Adrian Bunk <bunk@stusta.de>

    UID16 was accidentially disabled for !EMBEDDED.

Signed-off-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

19 files changed, 28 insertions, 65 deletions

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 153337ff1d7b..eedf41bf7057 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig
@@ -18,9 +18,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-
 config RWSEM_GENERIC_SPINLOCK
         bool
 
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 16a5d522b2f2..7a74e3e5f916 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -46,10 +46,6 @@ config MCA
           <file:Documentation/mca.txt> (and especially the web page given
           there) before attempting to build an MCA bus kernel.
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/arm26/Kconfig b/arch/arm26/Kconfig
index 1f00b3d03a07..274e07019b46 100644
--- a/arch/arm26/Kconfig
+++ b/arch/arm26/Kconfig
@@ -34,10 +34,6 @@ config FORCE_MAX_ZONEORDER
         int
         default 9
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/cris/Kconfig b/arch/cris/Kconfig
index e5979d68e352..b83261949737 100644
--- a/arch/cris/Kconfig
+++ b/arch/cris/Kconfig
@@ -9,10 +9,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 26698a49f153..80940d712acf 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -21,10 +21,6 @@ config FPU
         bool
         default n
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
index 810ba8c37a5f..d849c6870e3a 100644
--- a/arch/i386/Kconfig
+++ b/arch/i386/Kconfig
@@ -29,10 +29,6 @@ config MMU
 config SBUS
         bool
 
-config UID16
-        bool
-        default y
-
 config GENERIC_ISA_DMA
         bool
         default y
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 1dd5d18b2201..96b919828053 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -10,10 +10,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index b96498120fe9..e2a6e8648960 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -17,10 +17,6 @@ config FPU
         bool
         default n
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 874a283edb95..e77a06e9621e 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -19,9 +19,6 @@ config MMU
 config STACK_GROWSUP
         def_bool y
 
-config UID16
-        bool
-
 config RWSEM_GENERIC_SPINLOCK
         def_bool y
 
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index db93dbc0e21a..331483ace0d9 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -26,9 +26,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-
 config GENERIC_HARDIRQS
         bool
         default y
diff --git a/arch/ppc/Kconfig b/arch/ppc/Kconfig
index cc3f64c084c5..e396f4591d59 100644
--- a/arch/ppc/Kconfig
+++ b/arch/ppc/Kconfig
@@ -8,9 +8,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-
 config GENERIC_HARDIRQS
         bool
         default y
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 64f5ae0ff96d..8cf6d437a630 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -14,10 +14,6 @@ config SUPERH
           gaming console.  The SuperH port has a home page at
           <http://www.linux-sh.org/>.
 
-config UID16
-        bool
-        default y
-
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index 56c34e7fd4ee..f944b58cdfe7 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -9,10 +9,6 @@ config MMU
         bool
         default y
 
-config UID16
-        bool
-        default y
-
 config HIGHMEM
         bool
         default y
diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
index c4b7ad70cd7c..b775ceb4cf98 100644
--- a/arch/sparc64/Kconfig
+++ b/arch/sparc64/Kconfig
@@ -309,11 +309,6 @@ config COMPAT
         depends on SPARC32_COMPAT
         default y
 
-config UID16
-        bool
-        depends on SPARC32_COMPAT
-        default y
-
 config BINFMT_ELF32
         tristate "Kernel support for 32-bit ELF binaries"
         depends on SPARC32_COMPAT
diff --git a/arch/um/Kconfig b/arch/um/Kconfig
index cdaa2ab19258..b4ff2e576021 100644
--- a/arch/um/Kconfig
+++ b/arch/um/Kconfig
@@ -22,10 +22,6 @@ config SBUS
 config PCI
         bool
 
-config UID16
-        bool
-        default y
-
 config GENERIC_CALIBRATE_DELAY
         bool
         default y
diff --git a/arch/v850/Kconfig b/arch/v850/Kconfig
index 310865903234..04494638b963 100644
--- a/arch/v850/Kconfig
+++ b/arch/v850/Kconfig
@@ -10,9 +10,6 @@ mainmenu "uClinux/v850 (w/o MMU) Kernel Configuration"
 config MMU
         bool
         default n
-config UID16
-        bool
-        default n
 config RWSEM_GENERIC_SPINLOCK
         bool
         default y
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index 6ece645e4dbe..4f3e925962c3 100644
--- a/arch/x86_64/Kconfig
+++ b/arch/x86_64/Kconfig
@@ -542,11 +542,6 @@ config SYSVIPC_COMPAT
         depends on COMPAT && SYSVIPC
         default y
 
-config UID16
-        bool
-        depends on IA32_EMULATION
-        default y
-
 endmenu
 
 source "net/Kconfig"
diff --git a/init/Kconfig b/init/Kconfig
index 0eb65f2ad8c9..1a1f114a37e8 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -228,6 +228,15 @@ config CPUSETS
 
 source "usr/Kconfig"
 
+config UID16
+        bool "Enable 16-bit UID system calls" if EMBEDDED
+        depends !ALPHA && !PPC && !PPC64 && !PARISC && !V850 && !ARCH_S390X
+        depends !X86_64 || IA32_EMULATION
+        depends !SPARC64 || SPARC32_COMPAT
+        default y
+        help
+          This enables the legacy 16-bit UID syscall wrappers.
+
 config CC_OPTIMIZE_FOR_SIZE
         bool "Optimize for size (Look out for broken compilers!)"
         default y
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index 7a8bc7f60d91..72cafc922d39 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -83,6 +83,25 @@ cond_syscall(sys_inotify_init);
 cond_syscall(sys_inotify_add_watch);
 cond_syscall(sys_inotify_rm_watch);
 cond_syscall(sys_migrate_pages);
+cond_syscall(sys_chown16);
+cond_syscall(sys_fchown16);
+cond_syscall(sys_getegid16);
+cond_syscall(sys_geteuid16);
+cond_syscall(sys_getgid16);
+cond_syscall(sys_getgroups16);
+cond_syscall(sys_getresgid16);
+cond_syscall(sys_getresuid16);
+cond_syscall(sys_getuid16);
+cond_syscall(sys_lchown16);
+cond_syscall(sys_setfsgid16);
+cond_syscall(sys_setfsuid16);
+cond_syscall(sys_setgid16);
+cond_syscall(sys_setgroups16);
+cond_syscall(sys_setregid16);
+cond_syscall(sys_setresgid16);
+cond_syscall(sys_setresuid16);
+cond_syscall(sys_setreuid16);
+cond_syscall(sys_setuid16);
 
 /* arch-specific weak syscall entries */
 cond_syscall(sys_pciconfig_read);