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authorArnd Bergmann <arnd@arndb.de>2022-02-11 21:42:45 +0100
committerArnd Bergmann <arnd@arndb.de>2022-02-25 09:36:06 +0100
commit967747bbc084b93b54e66f9047d342232314cd25 (patch)
tree816678a5afa21612d3d420c2cd6fc61abc64cda1 /arch/microblaze
parente5ef21d139957b8d064fefb7db42d1525605dd98 (diff)
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/microblaze')
-rw-r--r--arch/microblaze/Kconfig1
-rw-r--r--arch/microblaze/include/asm/thread_info.h6
-rw-r--r--arch/microblaze/include/asm/uaccess.h24
-rw-r--r--arch/microblaze/kernel/asm-offsets.c1
-rw-r--r--arch/microblaze/kernel/process.c1
5 files changed, 0 insertions, 33 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 59798e43cdb0..1fb1cec087b7 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -42,7 +42,6 @@ config MICROBLAZE
select CPU_NO_EFFICIENT_FFS
select MMU_GATHER_NO_RANGE
select SPARSE_IRQ
- select SET_FS
select ZONE_DMA
select TRACE_IRQFLAGS_SUPPORT
diff --git a/arch/microblaze/include/asm/thread_info.h b/arch/microblaze/include/asm/thread_info.h
index 44f5ca331862..a0ddd2a36fb9 100644
--- a/arch/microblaze/include/asm/thread_info.h
+++ b/arch/microblaze/include/asm/thread_info.h
@@ -56,17 +56,12 @@ struct cpu_context {
__u32 fsr;
};
-typedef struct {
- unsigned long seg;
-} mm_segment_t;
-
struct thread_info {
struct task_struct *task; /* main task structure */
unsigned long flags; /* low level flags */
unsigned long status; /* thread-synchronous flags */
__u32 cpu; /* current CPU */
__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
- mm_segment_t addr_limit; /* thread address space */
struct cpu_context cpu_context;
};
@@ -80,7 +75,6 @@ struct thread_info {
.flags = 0, \
.cpu = 0, \
.preempt_count = INIT_PREEMPT_COUNT, \
- .addr_limit = KERNEL_DS, \
}
/* how to get the thread information struct from C */
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index bf9b7657a65a..3aab2f17e046 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -15,30 +15,6 @@
#include <linux/pgtable.h>
#include <asm/extable.h>
#include <linux/string.h>
-
-/*
- * On Microblaze the fs value is actually the top of the corresponding
- * address space.
- *
- * 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.
- *
- * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
- */
-# define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
-
-# define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF)
-# define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
-
-# define get_fs() (current_thread_info()->addr_limit)
-# define set_fs(val) (current_thread_info()->addr_limit = (val))
-# define user_addr_max() get_fs().seg
-
-# define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
-
#include <asm-generic/access_ok.h>
# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
diff --git a/arch/microblaze/kernel/asm-offsets.c b/arch/microblaze/kernel/asm-offsets.c
index b77dd188dec4..47ee409508b1 100644
--- a/arch/microblaze/kernel/asm-offsets.c
+++ b/arch/microblaze/kernel/asm-offsets.c
@@ -86,7 +86,6 @@ int main(int argc, char *argv[])
/* struct thread_info */
DEFINE(TI_TASK, offsetof(struct thread_info, task));
DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
- DEFINE(TI_ADDR_LIMIT, offsetof(struct thread_info, addr_limit));
DEFINE(TI_CPU_CONTEXT, offsetof(struct thread_info, cpu_context));
DEFINE(TI_PREEMPT_COUNT, offsetof(struct thread_info, preempt_count));
BLANK();
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 5e2b91c1e8ce..1b944d319d73 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -18,7 +18,6 @@
#include <linux/tick.h>
#include <linux/bitops.h>
#include <linux/ptrace.h>
-#include <linux/uaccess.h> /* for USER_DS macros */
#include <asm/cacheflush.h>
void show_regs(struct pt_regs *regs)