diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2015-07-18 22:38:41 (GMT) |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-08-03 07:25:02 (GMT) |
| commit | 1d62d737555e1378eb62a8bba26644f7d97139d2 (patch) | |
| tree | d1fffa62c9f64906ef53de72d31a4d04cc94d0f6 | |
| parent | d3557d96163d7d8250549a438232c5dd62d96959 (diff) | |
| download | linux-1d62d737555e1378eb62a8bba26644f7d97139d2.tar.xz | |
MIPS: Fix sched_getaffinity with MT FPAFF enabled
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>
| -rw-r--r-- | arch/mips/kernel/mips-mt-fpaff.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/mips/kernel/mips-mt-fpaff.c b/arch/mips/kernel/mips-mt-fpaff.c index 3e4491a..789d7bf 100644 --- a/arch/mips/kernel/mips-mt-fpaff.c +++ b/arch/mips/kernel/mips-mt-fpaff.c @@ -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); |