35 lines
1.1 KiB
Diff
35 lines
1.1 KiB
Diff
From: Felix Fietkau <nbd@openwrt.org>
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Date: Sun, 19 Jul 2015 00:21:57 +0200
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Subject: [PATCH] MIPS: kernel: fix sched_getaffinity with MT FPAFF enabled
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p->thread.user_cpus_allowed is zero-initialized and is only filled on
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the first sched_setaffinity call.
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To avoid adding overhead in the task initialization codepath, simply OR
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the returned mask in sched_getaffinity with p->cpus_allowed.
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Cc: stable@vger.kernel.org
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/arch/mips/kernel/mips-mt-fpaff.c
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+++ b/arch/mips/kernel/mips-mt-fpaff.c
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@@ -154,7 +154,7 @@ asmlinkage long mipsmt_sys_sched_getaffi
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unsigned long __user *user_mask_ptr)
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{
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unsigned int real_len;
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- cpumask_t mask;
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+ cpumask_t allowed, mask;
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int retval;
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struct task_struct *p;
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@@ -173,7 +173,8 @@ asmlinkage long mipsmt_sys_sched_getaffi
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if (retval)
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goto out_unlock;
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- cpumask_and(&mask, &p->thread.user_cpus_allowed, cpu_possible_mask);
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+ cpumask_or(&allowed, &p->thread.user_cpus_allowed, &p->cpus_allowed);
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+ cpumask_and(&mask, &allowed, cpu_active_mask);
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out_unlock:
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read_unlock(&tasklist_lock);
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