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authorArnd Bergmann <arnd@arndb.de>2022-02-11 23:42:45 +0300
committerArnd Bergmann <arnd@arndb.de>2022-02-25 11:36:06 +0300
commit967747bbc084b93b54e66f9047d342232314cd25 (patch)
tree816678a5afa21612d3d420c2cd6fc61abc64cda1 /arch/arc
parente5ef21d139957b8d064fefb7db42d1525605dd98 (diff)
downloadlinux-967747bbc084b93b54e66f9047d342232314cd25.tar.xz
uaccess: remove CONFIG_SET_FS
There are no remaining callers of set_fs(), so CONFIG_SET_FS can be removed globally, along with the thread_info field and any references to it. This turns access_ok() into a cheaper check against TASK_SIZE_MAX. As CONFIG_SET_FS is now gone, drop all remaining references to set_fs()/get_fs(), mm_segment_t, user_addr_max() and uaccess_kernel(). Acked-by: Sam Ravnborg <sam@ravnborg.org> # for sparc32 changes Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Tested-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> # for arc changes Acked-by: Stafford Horne <shorne@gmail.com> # [openrisc, asm-generic] Acked-by: Dinh Nguyen <dinguyen@kernel.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/Kconfig1
-rw-r--r--arch/arc/include/asm/segment.h20
-rw-r--r--arch/arc/include/asm/thread_info.h3
-rw-r--r--arch/arc/include/asm/uaccess.h1
4 files changed, 0 insertions, 25 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 3c2a4753d09b..e0a60a27e14d 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -45,7 +45,6 @@ config ARC
select PCI_SYSCALL if PCI
select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING
select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32
- select SET_FS
select TRACE_IRQFLAGS_SUPPORT
config LOCKDEP_SUPPORT
diff --git a/arch/arc/include/asm/segment.h b/arch/arc/include/asm/segment.h
deleted file mode 100644
index 871f8ab11bfd..000000000000
--- a/arch/arc/include/asm/segment.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
- */
-
-#ifndef __ASMARC_SEGMENT_H
-#define __ASMARC_SEGMENT_H
-
-#ifndef __ASSEMBLY__
-
-typedef unsigned long mm_segment_t;
-
-#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-#define KERNEL_DS MAKE_MM_SEG(0)
-#define USER_DS MAKE_MM_SEG(TASK_SIZE)
-#define uaccess_kernel() (get_fs() == KERNEL_DS)
-
-#endif /* __ASSEMBLY__ */
-#endif /* __ASMARC_SEGMENT_H */
diff --git a/arch/arc/include/asm/thread_info.h b/arch/arc/include/asm/thread_info.h
index d36863e34bfc..1e0b2e3914d5 100644
--- a/arch/arc/include/asm/thread_info.h
+++ b/arch/arc/include/asm/thread_info.h
@@ -27,7 +27,6 @@
#ifndef __ASSEMBLY__
#include <linux/thread_info.h>
-#include <asm/segment.h>
/*
* low level task data that entry.S needs immediate access to
@@ -40,7 +39,6 @@ struct thread_info {
unsigned long flags; /* low level flags */
int preempt_count; /* 0 => preemptable, <0 => BUG */
struct task_struct *task; /* main task structure */
- mm_segment_t addr_limit; /* thread address space */
__u32 cpu; /* current CPU */
unsigned long thr_ptr; /* TLS ptr */
};
@@ -56,7 +54,6 @@ struct thread_info {
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
static inline __attribute_const__ struct thread_info *current_thread_info(void)
diff --git a/arch/arc/include/asm/uaccess.h b/arch/arc/include/asm/uaccess.h
index 30f80b4be2ab..99712471c96a 100644
--- a/arch/arc/include/asm/uaccess.h
+++ b/arch/arc/include/asm/uaccess.h
@@ -638,7 +638,6 @@ extern unsigned long arc_clear_user_noinline(void __user *to,
#define __clear_user(d, n) arc_clear_user_noinline(d, n)
#endif
-#include <asm/segment.h>
#include <asm-generic/uaccess.h>
#endif