leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

riscv: remove address space overrides using set_fs()

Browse Source 
Stop providing the possibility to override the address space using
set_fs() now that there is no need for that any more.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Christoph Hellwig
2020-09-07 07:58:25 +02:00
committed by Palmer Dabbelt
parent d464118cdc
commit e8d444d3e9
4 changed files with 1 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
arch/riscv/include/asm/uaccess.h
View File

@@ -26,29 +26,6 @@
#define __disable_user_access() \
__asm__ __volatile__ ("csrc sstatus, %0" : : "r" (SR_SUM) : "memory")
/*
* The fs value determines whether argument validity checking should be
* performed or not. If get_fs() == USER_DS, checking is performed, with
* get_fs() == KERNEL_DS, checking is bypassed.
*
* For historical reasons, these macros are grossly misnamed.
*/
#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
#define KERNEL_DS MAKE_MM_SEG(~0UL)
#define USER_DS MAKE_MM_SEG(TASK_SIZE)
#define get_fs() (current_thread_info()->addr_limit)
static inline void set_fs(mm_segment_t fs)
{
current_thread_info()->addr_limit = fs;
}
#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
#define user_addr_max() (get_fs().seg)
/**
* access_ok: - Checks if a user space pointer is valid
* @addr: User space pointer to start of block to check
@@ -76,9 +53,7 @@ static inline void set_fs(mm_segment_t fs)
*/
static inline int __access_ok(unsigned long addr, unsigned long size)
{
const mm_segment_t fs = get_fs();
return size <= fs.seg && addr <= fs.seg - size;
return size <= TASK_SIZE && addr <= TASK_SIZE - size;
}
/*