powerpc: Enable syscall wrappers for 64-bit

commit ee6a093222549ac0c72cfd296c69fa5e7d6daa34 upstream.

This enables the use of syscall wrappers to do proper sign extension
for 64-bit programs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 587da5e0990f9504979f9357b2783305e6a23d02..a2b228f54366e629448c3810bb6e335663f05ebe 100644 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -122,6 +122,7 @@ config PPC
        select HAVE_DMA_ATTRS if PPC64
        select USE_GENERIC_SMP_HELPERS if SMP
        select HAVE_OPROFILE
+       select HAVE_SYSCALL_WRAPPERS if PPC64
 
 config EARLY_PRINTK
        bool

diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index b17ab6906d117ea28cfd71761df92053478a8a99..8061f611219e8e8c45227809cddfbdadebf07725 100644 (file)
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -103,8 +103,14 @@ struct old_linux_dirent;
 #define SYSCALL_DEFINE5(...)    SYSCALL_DEFINEx(5, __VA_ARGS__)
 #define SYSCALL_DEFINE6(...)    SYSCALL_DEFINEx(6, __VA_ARGS__)
 
+#ifdef CONFIG_PPC64
+#define SYSCALL_ALIAS(alias, name)                                     \
+       asm ("\t.globl " #alias "\n\t.set " #alias ", " #name "\n"      \
+            "\t.globl ." #alias "\n\t.set ." #alias ", ." #name)
+#else
 #define SYSCALL_ALIAS(alias, name)                                     \
        asm ("\t.globl " #alias "\n\t.set " #alias ", " #name)
+#endif
 
 #ifdef CONFIG_HAVE_SYSCALL_WRAPPERS