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MIPS: Fix sched_getaffinity with MT FPAFF enabled

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p->thread.user_cpus_allowed is zero-initialized and is only filled on
the first sched_setaffinity call.

To avoid adding overhead in the task initialization codepath, simply OR
the returned mask in sched_getaffinity with p->cpus_allowed.

Cc: stable@vger.kernel.org
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10740/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Felix Fietkau 2015-07-19 00:38:41 +02:00 committed by Ralf Baechle
parent d3557d9616
commit 1d62d73755
1 changed files with 3 additions and 2 deletions
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5
arch/mips/kernel/mips-mt-fpaff.c
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@ -154,7 +154,7 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
unsigned long __user *user_mask_ptr)
{
unsigned int real_len;
cpumask_t mask;
cpumask_t allowed, mask;
int retval;
struct task_struct *p;
@ -173,7 +173,8 @@ asmlinkage long mipsmt_sys_sched_getaffinity(pid_t pid, unsigned int len,
if (retval)
goto out_unlock;
cpumask_and(&mask, &p->thread.user_cpus_allowed, cpu_possible_mask);
cpumask_or(&allowed, &p->thread.user_cpus_allowed, &p->cpus_allowed);
cpumask_and(&mask, &allowed, cpu_active_mask);
out_unlock:
read_unlock(&tasklist_lock);