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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /arch/tile/lib
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'arch/tile/lib')
-rw-r--r--arch/tile/lib/exports.c3
-rw-r--r--arch/tile/lib/memcpy_user_64.c4
-rw-r--r--arch/tile/lib/spinlock_32.c11
-rw-r--r--arch/tile/lib/spinlock_64.c11
-rw-r--r--arch/tile/lib/usercopy_32.S46
-rw-r--r--arch/tile/lib/usercopy_64.S46
6 files changed, 22 insertions, 99 deletions
diff --git a/arch/tile/lib/exports.c b/arch/tile/lib/exports.c
index 82733c87d..9d171ca43 100644
--- a/arch/tile/lib/exports.c
+++ b/arch/tile/lib/exports.c
@@ -18,8 +18,6 @@
/* arch/tile/lib/usercopy.S */
#include <linux/uaccess.h>
-EXPORT_SYMBOL(strnlen_user_asm);
-EXPORT_SYMBOL(strncpy_from_user_asm);
EXPORT_SYMBOL(clear_user_asm);
EXPORT_SYMBOL(flush_user_asm);
EXPORT_SYMBOL(finv_user_asm);
@@ -28,7 +26,6 @@ EXPORT_SYMBOL(finv_user_asm);
#include <linux/kernel.h>
#include <asm/processor.h>
EXPORT_SYMBOL(current_text_addr);
-EXPORT_SYMBOL(dump_stack);
/* arch/tile/kernel/head.S */
EXPORT_SYMBOL(empty_zero_page);
diff --git a/arch/tile/lib/memcpy_user_64.c b/arch/tile/lib/memcpy_user_64.c
index 88c701649..97bbb6060 100644
--- a/arch/tile/lib/memcpy_user_64.c
+++ b/arch/tile/lib/memcpy_user_64.c
@@ -28,7 +28,7 @@
#define _ST(p, inst, v) \
({ \
asm("1: " #inst " %0, %1;" \
- ".pushsection .coldtext.memcpy,\"ax\";" \
+ ".pushsection .coldtext,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
".align 8;" \
@@ -41,7 +41,7 @@
({ \
unsigned long __v; \
asm("1: " #inst " %0, %1;" \
- ".pushsection .coldtext.memcpy,\"ax\";" \
+ ".pushsection .coldtext,\"ax\";" \
"2: { move r0, %2; jrp lr };" \
".section __ex_table,\"a\";" \
".align 8;" \
diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c
index b34f79aad..88c2a5336 100644
--- a/arch/tile/lib/spinlock_32.c
+++ b/arch/tile/lib/spinlock_32.c
@@ -65,8 +65,17 @@ EXPORT_SYMBOL(arch_spin_trylock);
void arch_spin_unlock_wait(arch_spinlock_t *lock)
{
u32 iterations = 0;
- while (arch_spin_is_locked(lock))
+ int curr = READ_ONCE(lock->current_ticket);
+ int next = READ_ONCE(lock->next_ticket);
+
+ /* Return immediately if unlocked. */
+ if (next == curr)
+ return;
+
+ /* Wait until the current locker has released the lock. */
+ do {
delay_backoff(iterations++);
+ } while (READ_ONCE(lock->current_ticket) == curr);
}
EXPORT_SYMBOL(arch_spin_unlock_wait);
diff --git a/arch/tile/lib/spinlock_64.c b/arch/tile/lib/spinlock_64.c
index d6fb9581e..c8d1f94ff 100644
--- a/arch/tile/lib/spinlock_64.c
+++ b/arch/tile/lib/spinlock_64.c
@@ -65,8 +65,17 @@ EXPORT_SYMBOL(arch_spin_trylock);
void arch_spin_unlock_wait(arch_spinlock_t *lock)
{
u32 iterations = 0;
- while (arch_spin_is_locked(lock))
+ u32 val = READ_ONCE(lock->lock);
+ u32 curr = arch_spin_current(val);
+
+ /* Return immediately if unlocked. */
+ if (arch_spin_next(val) == curr)
+ return;
+
+ /* Wait until the current locker has released the lock. */
+ do {
delay_backoff(iterations++);
+ } while (arch_spin_current(READ_ONCE(lock->lock)) == curr);
}
EXPORT_SYMBOL(arch_spin_unlock_wait);
diff --git a/arch/tile/lib/usercopy_32.S b/arch/tile/lib/usercopy_32.S
index 1bc162224..db93ad5fa 100644
--- a/arch/tile/lib/usercopy_32.S
+++ b/arch/tile/lib/usercopy_32.S
@@ -20,52 +20,6 @@
/* Access user memory, but use MMU to avoid propagating kernel exceptions. */
/*
- * strnlen_user_asm takes the pointer in r0, and the length bound in r1.
- * It returns the length, including the terminating NUL, or zero on exception.
- * If length is greater than the bound, returns one plus the bound.
- */
-STD_ENTRY(strnlen_user_asm)
- { bz r1, 2f; addi r3, r0, -1 } /* bias down to include NUL */
-1: { lb_u r4, r0; addi r1, r1, -1 }
- bz r4, 2f
- { bnzt r1, 1b; addi r0, r0, 1 }
-2: { sub r0, r0, r3; jrp lr }
- STD_ENDPROC(strnlen_user_asm)
- .pushsection .fixup,"ax"
-strnlen_user_fault:
- { move r0, zero; jrp lr }
- ENDPROC(strnlen_user_fault)
- .section __ex_table,"a"
- .align 4
- .word 1b, strnlen_user_fault
- .popsection
-
-/*
- * strncpy_from_user_asm takes the kernel target pointer in r0,
- * the userspace source pointer in r1, and the length bound (including
- * the trailing NUL) in r2. On success, it returns the string length
- * (not including the trailing NUL), or -EFAULT on failure.
- */
-STD_ENTRY(strncpy_from_user_asm)
- { bz r2, 2f; move r3, r0 }
-1: { lb_u r4, r1; addi r1, r1, 1; addi r2, r2, -1 }
- { sb r0, r4; addi r0, r0, 1 }
- bz r4, 2f
- bnzt r2, 1b
- { sub r0, r0, r3; jrp lr }
-2: addi r0, r0, -1 /* don't count the trailing NUL */
- { sub r0, r0, r3; jrp lr }
- STD_ENDPROC(strncpy_from_user_asm)
- .pushsection .fixup,"ax"
-strncpy_from_user_fault:
- { movei r0, -EFAULT; jrp lr }
- ENDPROC(strncpy_from_user_fault)
- .section __ex_table,"a"
- .align 4
- .word 1b, strncpy_from_user_fault
- .popsection
-
-/*
* clear_user_asm takes the user target address in r0 and the
* number of bytes to zero in r1.
* It returns the number of uncopiable bytes (hopefully zero) in r0.
diff --git a/arch/tile/lib/usercopy_64.S b/arch/tile/lib/usercopy_64.S
index b3b31a330..9322dc551 100644
--- a/arch/tile/lib/usercopy_64.S
+++ b/arch/tile/lib/usercopy_64.S
@@ -20,52 +20,6 @@
/* Access user memory, but use MMU to avoid propagating kernel exceptions. */
/*
- * strnlen_user_asm takes the pointer in r0, and the length bound in r1.
- * It returns the length, including the terminating NUL, or zero on exception.
- * If length is greater than the bound, returns one plus the bound.
- */
-STD_ENTRY(strnlen_user_asm)
- { beqz r1, 2f; addi r3, r0, -1 } /* bias down to include NUL */
-1: { ld1u r4, r0; addi r1, r1, -1 }
- beqz r4, 2f
- { bnezt r1, 1b; addi r0, r0, 1 }
-2: { sub r0, r0, r3; jrp lr }
- STD_ENDPROC(strnlen_user_asm)
- .pushsection .fixup,"ax"
-strnlen_user_fault:
- { move r0, zero; jrp lr }
- ENDPROC(strnlen_user_fault)
- .section __ex_table,"a"
- .align 8
- .quad 1b, strnlen_user_fault
- .popsection
-
-/*
- * strncpy_from_user_asm takes the kernel target pointer in r0,
- * the userspace source pointer in r1, and the length bound (including
- * the trailing NUL) in r2. On success, it returns the string length
- * (not including the trailing NUL), or -EFAULT on failure.
- */
-STD_ENTRY(strncpy_from_user_asm)
- { beqz r2, 2f; move r3, r0 }
-1: { ld1u r4, r1; addi r1, r1, 1; addi r2, r2, -1 }
- { st1 r0, r4; addi r0, r0, 1 }
- beqz r4, 2f
- bnezt r2, 1b
- { sub r0, r0, r3; jrp lr }
-2: addi r0, r0, -1 /* don't count the trailing NUL */
- { sub r0, r0, r3; jrp lr }
- STD_ENDPROC(strncpy_from_user_asm)
- .pushsection .fixup,"ax"
-strncpy_from_user_fault:
- { movei r0, -EFAULT; jrp lr }
- ENDPROC(strncpy_from_user_fault)
- .section __ex_table,"a"
- .align 8
- .quad 1b, strncpy_from_user_fault
- .popsection
-
-/*
* clear_user_asm takes the user target address in r0 and the
* number of bytes to zero in r1.
* It returns the number of uncopiable bytes (hopefully zero) in r0.