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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2006-10-09 00:10:01 +0900
committerRalf Baechle <ralf@linux-mips.org>2006-10-09 23:20:48 +0100
commite04582b7bc70b40c57287cdc24f81964ee88f565 (patch)
treea5127c2d4165e656a84612836f6326427843acca /arch/mips/kernel/ptrace.c
parentf5c70dd7f384db4c524c35288d9be3ed61ac41a9 (diff)
[MIPS] Make sure cpu_has_fpu is used only in atomic context
Make sure cpu_has_fpu (which uses smp_processor_id()) is used only in atomic context. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/ptrace.c')
-rw-r--r--arch/mips/kernel/ptrace.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 362d1728e53..258d74fd0b6 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -106,6 +106,7 @@ int ptrace_setregs (struct task_struct *child, __s64 __user *data)
int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
{
int i;
+ unsigned int tmp;
if (!access_ok(VERIFY_WRITE, data, 33 * 8))
return -EIO;
@@ -121,10 +122,10 @@ int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
__put_user (child->thread.fpu.fcr31, data + 64);
+ preempt_disable();
if (cpu_has_fpu) {
- unsigned int flags, tmp;
+ unsigned int flags;
- preempt_disable();
if (cpu_has_mipsmt) {
unsigned int vpflags = dvpe();
flags = read_c0_status();
@@ -138,11 +139,11 @@ int ptrace_getfpregs (struct task_struct *child, __u32 __user *data)
__asm__ __volatile__("cfc1\t%0,$0" : "=r" (tmp));
write_c0_status(flags);
}
- preempt_enable();
- __put_user (tmp, data + 65);
} else {
- __put_user ((__u32) 0, data + 65);
+ tmp = 0;
}
+ preempt_enable();
+ __put_user (tmp, data + 65);
return 0;
}
@@ -245,16 +246,17 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
unsigned int mtflags;
#endif /* CONFIG_MIPS_MT_SMTC */
- if (!cpu_has_fpu)
+ preempt_disable();
+ if (!cpu_has_fpu) {
+ preempt_enable();
break;
+ }
#ifdef CONFIG_MIPS_MT_SMTC
/* Read-modify-write of Status must be atomic */
local_irq_save(irqflags);
mtflags = dmt();
#endif /* CONFIG_MIPS_MT_SMTC */
-
- preempt_disable();
if (cpu_has_mipsmt) {
unsigned int vpflags = dvpe();
flags = read_c0_status();