kernel: fix sched_getaffinity on MIPS SMP systems (fixes enabling RPS/XPS in netifd...

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46420 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/generic/patches-3.18/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch b/target/linux/generic/patches-3.18/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
new file mode 100644 (file)
index 0000000..a7bfef3
--- /dev/null
+++ b/target/linux/generic/patches-3.18/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
@@ -0,0 +1,35 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 19 Jul 2015 00:21:57 +0200
+Subject: [PATCH] MIPS: kernel: 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>
+---
+
+--- 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_getaffi
+                                     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_getaffi
+       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);

diff --git a/target/linux/generic/patches-4.0/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch b/target/linux/generic/patches-4.0/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
new file mode 100644 (file)
index 0000000..a7bfef3
--- /dev/null
+++ b/target/linux/generic/patches-4.0/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
@@ -0,0 +1,35 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 19 Jul 2015 00:21:57 +0200
+Subject: [PATCH] MIPS: kernel: 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>
+---
+
+--- 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_getaffi
+                                     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_getaffi
+       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);

diff --git a/target/linux/generic/patches-4.1/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch b/target/linux/generic/patches-4.1/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
new file mode 100644 (file)
index 0000000..a7bfef3
--- /dev/null
+++ b/target/linux/generic/patches-4.1/130-MIPS-kernel-fix-sched_getaffinity-with-MT-FPAFF-enab.patch
@@ -0,0 +1,35 @@
+From: Felix Fietkau <nbd@openwrt.org>
+Date: Sun, 19 Jul 2015 00:21:57 +0200
+Subject: [PATCH] MIPS: kernel: 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>
+---
+
+--- 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_getaffi
+                                     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_getaffi
+       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);