[PATCH] sh: Implement __get_user_u64() required for 64-bit get_user()

[John Paul Adrian Glaubitz]

Trying to build the kernel with CONFIG_INFINIBAND_USER_ACCESS enabled fails

     ERROR: "__get_user_unknown" [drivers/infiniband/core/ib_uverbs.ko] 
undefined!

with on SH since the kernel misses a 64-bit implementation of get_user().

Implement the missing 64-bit get_user() as __get_user_u64(), matching the
already existing __put_user_u64() which implements the 64-bit put_user().

Signed-off-by: John Paul Adrian Glaubitz <glaub...@physik.fu-berlin.de>
---
 arch/sh/include/asm/uaccess_32.h | 49 ++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/arch/sh/include/asm/uaccess_32.h b/arch/sh/include/asm/uaccess_32.h
index 624cf55acc27..8bc1cb50f8bf 100644
--- a/arch/sh/include/asm/uaccess_32.h
+++ b/arch/sh/include/asm/uaccess_32.h
@@ -26,6 +26,9 @@ do {                                                          
\
        case 4:                                                 \
                __get_user_asm(x, ptr, retval, "l");            \
                break;                                          \
+       case 8:                                                 \
+               __get_user_u64(x, ptr, retval);                 \
+               break;                                          \
        default:                                                \
                __get_user_unknown();                           \
                break;                                          \
@@ -66,6 +69,52 @@ do {                                                 \
 
 extern void __get_user_unknown(void);
 
+#if defined(CONFIG_CPU_LITTLE_ENDIAN)
+#define __get_user_u64(x, addr, err) \
+({ \
+__asm__ __volatile__( \
+       "1:\n\t" \
+       "mov.l  %2,%R1\n\t" \
+       "mov.l  %T2,%S1\n\t" \
+       "2:\n" \
+       ".section       .fixup,\"ax\"\n" \
+       "3:\n\t" \
+       "mov    #0, %1\n\t" \
+       "mov.l  4f, %0\n\t" \
+       "jmp    @%0\n\t" \
+       " mov   %3, %0\n\t" \
+       ".balign        4\n" \
+       "4:     .long   2b\n\t" \
+       ".previous\n" \
+       ".section       __ex_table,\"a\"\n\t" \
+       ".long  1b, 3b\n\t" \
+       ".previous" \
+       :"=&r" (err), "=&r" (x) \
+       :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#else
+#define __get_user_u64(x, addr, err) \
+({ \
+__asm__ __volatile__( \
+       "1:\n\t" \
+       "mov.l  %2,%S1\n\t" \
+       "mov.l  %T2,%R1\n\t" \
+       "2:\n" \
+       ".section       .fixup,\"ax\"\n" \
+       "3:\n\t" \
+       "mov    #0, %1\n\t" \
+       "mov.l  4f, %0\n\t" \
+       "jmp    @%0\n\t" \
+       " mov   %3, %0\n\t" \
+       ".balign        4\n" \
+       "4:     .long   2b\n\t" \
+       ".previous\n" \
+       ".section       __ex_table,\"a\"\n\t" \
+       ".long  1b, 3b\n\t" \
+       ".previous" \
+       :"=&r" (err), "=&r" (x) \
+       :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#endif
+
 #define __put_user_size(x,ptr,size,retval)             \
 do {                                                   \
        retval = 0;                                     \
-- 
2.27.0.rc2