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| author | Ingo Molnar <mingo@kernel.org> | 2016-11-16 10:16:28 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-11-16 10:16:28 +0100 |
| commit | 0acbc7aa4713b450ff46f9c9f6ce0060ea6947b1 (patch) | |
| tree | 480508a78b7d9e9c0da0ffbd33b40e0b4e076a16 /arch/arc/kernel/process.c | |
| parent | 353c50ebe329daaf2c94dc41c1c481cbba2a31fd (diff) | |
| parent | 81bcfe5e48f9b8c42cf547f1c74c7f60c44c34c8 (diff) | |
| download | linux-0acbc7aa4713b450ff46f9c9f6ce0060ea6947b1.tar.bz2 | |
Merge branch 'linus' into sched/core, to pick up fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/arc/kernel/process.c')
| -rw-r--r-- | arch/arc/kernel/process.c | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index 59aa43cb146e..a41a79a4f4fe 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -43,8 +43,8 @@ SYSCALL_DEFINE0(arc_gettls) SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int, expected, int, new) { - int uval; - int ret; + struct pt_regs *regs = current_pt_regs(); + int uval = -EFAULT; /* * This is only for old cores lacking LLOCK/SCOND, which by defintion @@ -54,24 +54,26 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int, expected, int, new) */ WARN_ON_ONCE(IS_ENABLED(CONFIG_SMP)); + /* Z indicates to userspace if operation succeded */ + regs->status32 &= ~STATUS_Z_MASK; + if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int))) return -EFAULT; preempt_disable(); - ret = __get_user(uval, uaddr); - if (ret) + if (__get_user(uval, uaddr)) goto done; - if (uval != expected) - ret = -EAGAIN; - else - ret = __put_user(new, uaddr); + if (uval == expected) { + if (!__put_user(new, uaddr)) + regs->status32 |= STATUS_Z_MASK; + } done: preempt_enable(); - return ret; + return uval; } void arch_cpu_idle(void) |