x86-64: __copy_from_user_inatomic() adjustments

This v2.6.26 commit:

    ad2fc2c: x86: fix copy_user on x86

rendered __copy_from_user_inatomic() identical to
copy_user_generic(), yet didn't make the former just call the
latter from an inline function.

Furthermore, this v2.6.19 commit:

    b885808: [PATCH] Add proper sparse __user casts to __copy_to_user_inatomic

converted the return type of __copy_to_user_inatomic() from
unsigned long to int, but didn't do the same to
__copy_from_user_inatomic().

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: <v.mayatskih@gmail.com>
LKML-Reference: <4AFD5778020000780001F8F4@vpn.id2.novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 5 insertions, 9 deletions

diff --git a/arch/x86/include/asm/uaccess_64.h b/arch/x86/include/asm/uaccess_64.h
index ce6fec7ce38d..7adebacaa325 100644
--- a/arch/x86/include/asm/uaccess_64.h
+++ b/arch/x86/include/asm/uaccess_64.h
@@ -193,8 +193,11 @@ __must_check long strlen_user(const char __user *str);
 __must_check unsigned long clear_user(void __user *mem, unsigned long len);
 __must_check unsigned long __clear_user(void __user *mem, unsigned long len);
 
-__must_check long __copy_from_user_inatomic(void *dst, const void __user *src,
-                                            unsigned size);
+static __must_check __always_inline int
+__copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
+{
+        return copy_user_generic(dst, (__force const void *)src, size);
+}
 
 static __must_check __always_inline int
 __copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
diff --git a/arch/x86/kernel/x8664_ksyms_64.c b/arch/x86/kernel/x8664_ksyms_64.c
index a0cdd8cc1d67..cd54276b6be8 100644
--- a/arch/x86/kernel/x8664_ksyms_64.c
+++ b/arch/x86/kernel/x8664_ksyms_64.c
@@ -32,7 +32,6 @@ EXPORT_SYMBOL(copy_user_generic);
 EXPORT_SYMBOL(__copy_user_nocache);
 EXPORT_SYMBOL(_copy_from_user);
 EXPORT_SYMBOL(copy_to_user);
-EXPORT_SYMBOL(__copy_from_user_inatomic);
 
 EXPORT_SYMBOL(copy_page);
 EXPORT_SYMBOL(clear_page);
diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S
index 4be3c415b3e9..39369985f1cb 100644
--- a/arch/x86/lib/copy_user_64.S
+++ b/arch/x86/lib/copy_user_64.S
@@ -96,12 +96,6 @@ ENTRY(copy_user_generic)
         CFI_ENDPROC
 ENDPROC(copy_user_generic)
 
-ENTRY(__copy_from_user_inatomic)
-        CFI_STARTPROC
-        ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,copy_user_generic_unrolled,copy_user_generic_string
-        CFI_ENDPROC
-ENDPROC(__copy_from_user_inatomic)
-
         .section .fixup,"ax"
         /* must zero dest */
 ENTRY(bad_from_user)