Commit 08ee3a00 authored by Thomas Bogendoerfer's avatar Thomas Bogendoerfer
Browse files

MIPS: uaccess: Added __get/__put_kernel_nofault 



Added __get/__put_kernel_nofault as preparation for removing
get/set_fs.

Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent 9a91dd50

arch/mips/include/asm/uaccess.h

+24 −0
Original line number Diff line number Diff line
@@ -355,6 +355,18 @@ do { \ 
	(val) = __gu_tmp.t;						\

}



#define HAVE_GET_KERNEL_NOFAULT



#define __get_kernel_nofault(dst, src, type, err_label)			\

do {									\

	int __gu_err;							\

									\

	__get_kernel_common(*((type *)(dst)), sizeof(type),		\

			    (__force type *)(src));			\

	if (unlikely(__gu_err))						\

		goto err_label;						\

} while (0)



#ifndef CONFIG_EVA

#define __put_kernel_common(ptr, size) __put_user_common(ptr, size)

#else
@@ -483,6 +495,18 @@ do { \ 


extern void __put_user_unknown(void);



#define __put_kernel_nofault(dst, src, type, err_label)			\

do {									\

	type __pu_val;					\

	int __pu_err = 0;						\

									\

	__pu_val = *(__force type *)(src);				\

	__put_kernel_common(((type *)(dst)), sizeof(type));		\

	if (unlikely(__pu_err))						\

		goto err_label;						\

} while (0)





/*

 * We're generating jump to subroutines which will be outside the range of

 * jump instructions

arch/mips/mm/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -22,6 +22,10 @@ else 
obj-y				+= uasm-mips.o

endif



ifndef CONFIG_EVA

obj-y				+= maccess.o

endif



obj-$(CONFIG_32BIT)		+= ioremap.o pgtable-32.o

obj-$(CONFIG_64BIT)		+= ioremap64.o pgtable-64.o

obj-$(CONFIG_HIGHMEM)		+= highmem.o

arch/mips/mm/maccess.c

0 → 100644
+10 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only



#include <linux/uaccess.h>

#include <linux/kernel.h>



bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)

{

	/* highest bit set means kernel space */

	return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1);

}