Commit e5c15400 authored by Al Viro's avatar Al Viro
Browse files

avr32: switch to RAW_COPY_USER 



This one needs profiling; use of asm variant of access_ok() might have
been performance-critical.  Now copy_{to,from}_user() are using the
C variant.  I doubt that it's going to have visible effects, but
that needs to be experimentally verified.

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 5cbe865b

arch/avr32/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ config AVR32 
	select HAVE_MOD_ARCH_SPECIFIC

	select MODULES_USE_ELF_RELA

	select HAVE_NMI

	select ARCH_HAS_RAW_COPY_USER

	help

	  AVR32 is a high-performance 32-bit RISC microprocessor core,

	  designed for cost-sensitive embedded applications, with particular

arch/avr32/include/asm/uaccess.h

+6 −22
Original line number Diff line number Diff line
@@ -66,34 +66,18 @@ static inline void set_fs(mm_segment_t s) 
extern __kernel_size_t __copy_user(void *to, const void *from,

				   __kernel_size_t n);



extern __kernel_size_t copy_to_user(void __user *to, const void *from,

				    __kernel_size_t n);

extern __kernel_size_t ___copy_from_user(void *to, const void __user *from,

				      __kernel_size_t n);



static inline __kernel_size_t __copy_to_user(void __user *to, const void *from,

					     __kernel_size_t n)

static inline unsigned long

raw_copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __copy_user((void __force *)to, from, n);

}

static inline __kernel_size_t __copy_from_user(void *to,

					       const void __user *from,

					       __kernel_size_t n)

static inline unsigned long

raw_copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __copy_user(to, (const void __force *)from, n);

}

static inline __kernel_size_t copy_from_user(void *to,

					       const void __user *from,

					       __kernel_size_t n)

{

	size_t res = ___copy_from_user(to, from, n);

	if (unlikely(res))

		memset(to + (n - res), 0, res);

	return res;

}



#define __copy_to_user_inatomic __copy_to_user

#define __copy_from_user_inatomic __copy_from_user

#define INLINE_COPY_FROM_USER

#define INLINE_COPY_TO_USER



/*

 * put_user: - Write a simple value into user space.

arch/avr32/kernel/avr32_ksyms.c

+0 −2
Original line number Diff line number Diff line
@@ -36,8 +36,6 @@ EXPORT_SYMBOL(copy_page); 
/*

 * Userspace access stuff.

 */

EXPORT_SYMBOL(___copy_from_user);

EXPORT_SYMBOL(copy_to_user);

EXPORT_SYMBOL(__copy_user);

EXPORT_SYMBOL(strncpy_from_user);

EXPORT_SYMBOL(__strncpy_from_user);

arch/avr32/lib/copy_user.S

+0 −15
Original line number Diff line number Diff line
@@ -23,21 +23,6 @@ 
	 */

	.text

	.align	1

	.global	___copy_from_user

	.type	___copy_from_user, @function

___copy_from_user:

	branch_if_kernel r8, __copy_user

	ret_if_privileged r8, r11, r10, r10

	rjmp	__copy_user

	.size	___copy_from_user, . - ___copy_from_user



	.global	copy_to_user

	.type	copy_to_user, @function

copy_to_user:

	branch_if_kernel r8, __copy_user

	ret_if_privileged r8, r12, r10, r10

	.size	copy_to_user, . - copy_to_user



	.global	__copy_user

	.type	__copy_user, @function

__copy_user:

CRA Git | Maintained and supported by SUSTech CRA and CCSE