Merge #159237: linuxKernel.packages.linux_4_4: drop

3 files changed, 17 insertions, 441 deletions

diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix
index 34e1b10b32a..671fdef2f5d 100644
--- a/pkgs/os-specific/linux/kernel/common-config.nix
+++ b/pkgs/os-specific/linux/kernel/common-config.nix
@@ -65,7 +65,7 @@ let
       X86_INTEL_PSTATE                 = yes;
       INTEL_IDLE                       = yes;
       CPU_FREQ_DEFAULT_GOV_PERFORMANCE = yes;
-      CPU_FREQ_GOV_SCHEDUTIL           = whenAtLeast "4.9" yes;
+      CPU_FREQ_GOV_SCHEDUTIL           = yes;
       PM_WAKELOCKS                     = yes;
       # Power-capping framework and support for INTEL RAPL
       POWERCAP                         = yes;
@@ -148,12 +148,12 @@ let
       IPV6_MROUTE                 = yes;
       IPV6_MROUTE_MULTIPLE_TABLES = yes;
       IPV6_PIMSM_V2               = yes;
-      IPV6_FOU_TUNNEL             = whenAtLeast "4.7" module;
+      IPV6_FOU_TUNNEL             = module;
       IPV6_SEG6_LWTUNNEL          = whenAtLeast "4.10" yes;
       IPV6_SEG6_HMAC              = whenAtLeast "4.10" yes;
       IPV6_SEG6_BPF               = whenAtLeast "4.18" yes;
-      NET_CLS_BPF                 = whenAtLeast "4.4" module;
-      NET_ACT_BPF                 = whenAtLeast "4.4" module;
+      NET_CLS_BPF                 = module;
+      NET_ACT_BPF                 = module;
       NET_SCHED                   = yes;
       L2TP_V3                     = yes;
       L2TP_IP                     = module;
@@ -168,7 +168,7 @@ let
       PPP_FILTER    = yes;
 
       # needed for iwd WPS support (wpa_supplicant replacement)
-      KEY_DH_OPERATIONS = whenAtLeast "4.7" yes;
+      KEY_DH_OPERATIONS = yes;
 
       # needed for nftables
       # Networking Options
@@ -208,7 +208,7 @@ let
       INET_TCP_DIAG     = mkDefault module;
       INET_UDP_DIAG     = mkDefault module;
       INET_RAW_DIAG     = whenAtLeast "4.14" (mkDefault module);
-      INET_DIAG_DESTROY = whenAtLeast "4.9" (mkDefault yes);
+      INET_DIAG_DESTROY = mkDefault yes;
 
       # enable multipath-tcp
       MPTCP           = whenAtLeast "5.6" yes;
@@ -267,11 +267,11 @@ let
       # necessary for amdgpu polaris support
       DRM_AMD_POWERPLAY = whenBetween "4.5" "4.9" yes;
       # (experimental) amdgpu support for verde and newer chipsets
-      DRM_AMDGPU_SI = whenAtLeast "4.9" yes;
+      DRM_AMDGPU_SI = yes;
       # (stable) amdgpu support for bonaire and newer chipsets
-      DRM_AMDGPU_CIK = whenAtLeast "4.9" yes;
+      DRM_AMDGPU_CIK = yes;
       # Allow device firmware updates
-      DRM_DP_AUX_CHARDEV = whenAtLeast "4.6" yes;
+      DRM_DP_AUX_CHARDEV = yes;
       # amdgpu display core (DC) support
       DRM_AMD_DC_DCN1_0 = whenBetween "4.15" "5.6" yes;
       DRM_AMD_DC_PRE_VEGA = whenBetween "4.15" "4.18" yes;
@@ -403,7 +403,6 @@ let
       F2FS_FS_COMPRESSION = whenAtLeast "5.6" yes;
       UDF_FS              = module;
 
-      NFSD_PNFS              = whenBetween "4.0" "4.6" yes;
       NFSD_V2_ACL            = yes;
       NFSD_V3                = yes;
       NFSD_V3_ACL            = yes;
@@ -460,7 +459,7 @@ let
       DEBUG_SET_MODULE_RONX            = { optional = true; tristate = whenOlder "4.11" "y"; };
       RANDOMIZE_BASE                   = option yes;
       STRICT_DEVMEM                    = mkDefault yes; # Filter access to /dev/mem
-      IO_STRICT_DEVMEM                 = whenAtLeast "4.5" (mkDefault yes);
+      IO_STRICT_DEVMEM                 = mkDefault yes;
       SECURITY_SELINUX_BOOTPARAM_VALUE = whenOlder "5.1" (freeform "0"); # Disable SELinux by default
       # Prevent processes from ptracing non-children processes
       SECURITY_YAMA                    = option yes;
@@ -515,10 +514,9 @@ let
       MEMCG                    = yes;
       MEMCG_SWAP               = yes;
 
-      DEVPTS_MULTIPLE_INSTANCES = whenOlder "4.7" yes;
       BLK_DEV_THROTTLING        = yes;
       CFQ_GROUP_IOSCHED         = whenOlder "5.0" yes; # Removed in 5.0-RC1
-      CGROUP_PIDS               = whenAtLeast "4.3" yes;
+      CGROUP_PIDS               = yes;
     };
 
     staging = {
@@ -543,9 +541,9 @@ let
       STACK_TRACER          = yes;
       UPROBE_EVENT          = { optional = true; tristate = whenOlder "4.11" "y";};
       UPROBE_EVENTS         = { optional = true; tristate = whenAtLeast "4.11" "y";};
-      BPF_SYSCALL           = whenAtLeast "4.4" yes;
+      BPF_SYSCALL           = yes;
       BPF_UNPRIV_DEFAULT_OFF = whenBetween "5.10" "5.15" yes;
-      BPF_EVENTS            = whenAtLeast "4.4" yes;
+      BPF_EVENTS            = yes;
       FUNCTION_PROFILER     = yes;
       RING_BUFFER_BENCHMARK = no;
     };
@@ -556,11 +554,10 @@ let
       HYPERVISOR_GUEST = yes;
       PARAVIRT_SPINLOCKS  = option yes;
 
-      KVM_APIC_ARCHITECTURE             = whenOlder "4.8" yes;
       KVM_ASYNC_PF                      = yes;
       KVM_COMPAT = { optional = true; tristate = whenBetween "4.0" "4.12" "y"; };
       KVM_DEVICE_ASSIGNMENT  = { optional = true; tristate = whenBetween "3.10" "4.12" "y"; };
-      KVM_GENERIC_DIRTYLOG_READ_PROTECT = whenAtLeast "4.0"  yes;
+      KVM_GENERIC_DIRTYLOG_READ_PROTECT = yes;
       KVM_GUEST                         = yes;
       KVM_MMIO                          = yes;
       KVM_VFIO                          = yes;
@@ -774,14 +771,14 @@ let
       SERIAL_DEV_CTRL_TTYPORT = whenAtLeast "4.11" yes; # enables support for TTY serial devices
 
       BT_HCIBTUSB_MTK = whenAtLeast "5.3" yes; # MediaTek protocol support
-      BT_HCIUART_QCA = whenAtLeast "4.3" yes; # Qualcomm Atheros protocol support
+      BT_HCIUART_QCA = yes; # Qualcomm Atheros protocol support
       BT_HCIUART_SERDEV = whenAtLeast "4.12" yes; # required by BT_HCIUART_QCA
-      BT_HCIUART = whenAtLeast "2.5.45" module; # required for BT devices with serial port interface (QCA6390)
+      BT_HCIUART = module; # required for BT devices with serial port interface (QCA6390)
       BT_HCIUART_BCSP = option yes;
       BT_HCIUART_H4   = option yes; # UART (H4) protocol support
       BT_HCIUART_LL   = option yes;
       BT_RFCOMM_TTY   = option yes; # RFCOMM TTY support
-      BT_QCA = whenAtLeast "4.3" module; # enables QCA6390 bluetooth
+      BT_QCA = module; # enables QCA6390 bluetooth
 
       CLEANCACHE = option yes;
       CRASH_DUMP = option no;
@@ -820,14 +817,12 @@ let
       MEDIA_ATTACH          = yes;
       MEGARAID_NEWGEN       = yes;
 
-      MLX4_EN_VXLAN = whenOlder "4.8" yes;
       MLX5_CORE_EN       = option yes;
 
       NVME_MULTIPATH = whenAtLeast "4.15" yes;
 
       PSI = whenAtLeast "4.20" yes;
 
-      MODVERSIONS        = whenOlder "4.9" yes;
       MOUSE_ELAN_I2C_SMBUS = yes;
       MOUSE_PS2_ELANTECH = yes; # Elantech PS/2 protocol extension
       MOUSE_PS2_VMMOUSE  = yes;
diff --git a/pkgs/os-specific/linux/kernel/cpu-cgroup-v2-patches/4.4.patch b/pkgs/os-specific/linux/kernel/cpu-cgroup-v2-patches/4.4.patch
deleted file mode 100644
index 8f2418c9efc..00000000000
--- a/pkgs/os-specific/linux/kernel/cpu-cgroup-v2-patches/4.4.patch
+++ /dev/null
@@ -1,407 +0,0 @@
-commit e7cae741f6d645ac68fe8823ca6ef45dbbf6891b
-Author: Tejun Heo <tj@kernel.org>
-Date:   Fri Mar 11 07:31:23 2016 -0500
-
-    sched: Misc preps for cgroup unified hierarchy interface
-    
-    Make the following changes in preparation for the cpu controller
-    interface implementation for the unified hierarchy.  This patch
-    doesn't cause any functional differences.
-    
-    * s/cpu_stats_show()/cpu_cfs_stats_show()/
-    
-    * s/cpu_files/cpu_legacy_files/
-    
-    * Separate out cpuacct_stats_read() from cpuacct_stats_show().  While
-      at it, remove pointless cpuacct_stat_desc[] array.
-    
-    Signed-off-by: Tejun Heo <tj@kernel.org>
-    Cc: Ingo Molnar <mingo@redhat.com>
-    Cc: Peter Zijlstra <peterz@infradead.org>
-    Cc: Li Zefan <lizefan@huawei.com>
-    Cc: Johannes Weiner <hannes@cmpxchg.org>
-
-diff --git a/kernel/sched/core.c b/kernel/sched/core.c
-index 732e993..77f3ddd 100644
---- a/kernel/sched/core.c
-+++ b/kernel/sched/core.c
-@@ -8512,7 +8512,7 @@ static int __cfs_schedulable(struct task_group *tg, u64 period, u64 quota)
- 	return ret;
- }
- 
--static int cpu_stats_show(struct seq_file *sf, void *v)
-+static int cpu_cfs_stats_show(struct seq_file *sf, void *v)
- {
- 	struct task_group *tg = css_tg(seq_css(sf));
- 	struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
-@@ -8552,7 +8552,7 @@ static u64 cpu_rt_period_read_uint(struct cgroup_subsys_state *css,
- }
- #endif /* CONFIG_RT_GROUP_SCHED */
- 
--static struct cftype cpu_files[] = {
-+static struct cftype cpu_legacy_files[] = {
- #ifdef CONFIG_FAIR_GROUP_SCHED
- 	{
- 		.name = "shares",
-@@ -8573,7 +8573,7 @@ static struct cftype cpu_files[] = {
- 	},
- 	{
- 		.name = "stat",
--		.seq_show = cpu_stats_show,
-+		.seq_show = cpu_cfs_stats_show,
- 	},
- #endif
- #ifdef CONFIG_RT_GROUP_SCHED
-@@ -8599,7 +8599,7 @@ struct cgroup_subsys cpu_cgrp_subsys = {
- 	.fork		= cpu_cgroup_fork,
- 	.can_attach	= cpu_cgroup_can_attach,
- 	.attach		= cpu_cgroup_attach,
--	.legacy_cftypes	= cpu_files,
-+	.legacy_cftypes	= cpu_legacy_files,
- 	.early_init	= 1,
- };
- 
-diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
-index dd7cbb5..42b2dd5 100644
---- a/kernel/sched/cpuacct.c
-+++ b/kernel/sched/cpuacct.c
-@@ -177,36 +177,33 @@ static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
- 	return 0;
- }
- 
--static const char * const cpuacct_stat_desc[] = {
--	[CPUACCT_STAT_USER] = "user",
--	[CPUACCT_STAT_SYSTEM] = "system",
--};
--
--static int cpuacct_stats_show(struct seq_file *sf, void *v)
-+static void cpuacct_stats_read(struct cpuacct *ca, u64 *userp, u64 *sysp)
- {
--	struct cpuacct *ca = css_ca(seq_css(sf));
- 	int cpu;
--	s64 val = 0;
- 
-+	*userp = 0;
- 	for_each_online_cpu(cpu) {
- 		struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
--		val += kcpustat->cpustat[CPUTIME_USER];
--		val += kcpustat->cpustat[CPUTIME_NICE];
-+		*userp += kcpustat->cpustat[CPUTIME_USER];
-+		*userp += kcpustat->cpustat[CPUTIME_NICE];
- 	}
--	val = cputime64_to_clock_t(val);
--	seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_USER], val);
- 
--	val = 0;
-+	*sysp = 0;
- 	for_each_online_cpu(cpu) {
- 		struct kernel_cpustat *kcpustat = per_cpu_ptr(ca->cpustat, cpu);
--		val += kcpustat->cpustat[CPUTIME_SYSTEM];
--		val += kcpustat->cpustat[CPUTIME_IRQ];
--		val += kcpustat->cpustat[CPUTIME_SOFTIRQ];
-+		*sysp += kcpustat->cpustat[CPUTIME_SYSTEM];
-+		*sysp += kcpustat->cpustat[CPUTIME_IRQ];
-+		*sysp += kcpustat->cpustat[CPUTIME_SOFTIRQ];
- 	}
-+}
- 
--	val = cputime64_to_clock_t(val);
--	seq_printf(sf, "%s %lld\n", cpuacct_stat_desc[CPUACCT_STAT_SYSTEM], val);
-+static int cpuacct_stats_show(struct seq_file *sf, void *v)
-+{
-+	cputime64_t user, sys;
- 
-+	cpuacct_stats_read(css_ca(seq_css(sf)), &user, &sys);
-+	seq_printf(sf, "user %lld\n", cputime64_to_clock_t(user));
-+	seq_printf(sf, "system %lld\n", cputime64_to_clock_t(sys));
- 	return 0;
- }
- 
-
-commit 1bb33e8a69f089f2d3f58a0e681d4ff352e11c97
-Author: Tejun Heo <tj@kernel.org>
-Date:   Fri Mar 11 07:31:23 2016 -0500
-
-    sched: Implement interface for cgroup unified hierarchy
-    
-    While the cpu controller doesn't have any functional problems, there
-    are a couple interface issues which can be addressed in the v2
-    interface.
-    
-    * cpuacct being a separate controller.  This separation is artificial
-      and rather pointless as demonstrated by most use cases co-mounting
-      the two controllers.  It also forces certain information to be
-      accounted twice.
-    
-    * Use of different time units.  Writable control knobs use
-      microseconds, some stat fields use nanoseconds while other cpuacct
-      stat fields use centiseconds.
-    
-    * Control knobs which can't be used in the root cgroup still show up
-      in the root.
-    
-    * Control knob names and semantics aren't consistent with other
-      controllers.
-    
-    This patchset implements cpu controller's interface on the unified
-    hierarchy which adheres to the controller file conventions described
-    in Documentation/cgroups/unified-hierarchy.txt.  Overall, the
-    following changes are made.
-    
-    * cpuacct is implictly enabled and disabled by cpu and its information
-      is reported through "cpu.stat" which now uses microseconds for all
-      time durations.  All time duration fields now have "_usec" appended
-      to them for clarity.  While this doesn't solve the double accounting
-      immediately, once majority of users switch to v2, cpu can directly
-      account and report the relevant stats and cpuacct can be disabled on
-      the unified hierarchy.
-    
-      Note that cpuacct.usage_percpu is currently not included in
-      "cpu.stat".  If this information is actually called for, it can be
-      added later.
-    
-    * "cpu.shares" is replaced with "cpu.weight" and operates on the
-      standard scale defined by CGROUP_WEIGHT_MIN/DFL/MAX (1, 100, 10000).
-      The weight is scaled to scheduler weight so that 100 maps to 1024
-      and the ratio relationship is preserved - if weight is W and its
-      scaled value is S, W / 100 == S / 1024.  While the mapped range is a
-      bit smaller than the orignal scheduler weight range, the dead zones
-      on both sides are relatively small and covers wider range than the
-      nice value mappings.  This file doesn't make sense in the root
-      cgroup and isn't create on root.
-    
-    * "cpu.cfs_quota_us" and "cpu.cfs_period_us" are replaced by "cpu.max"
-      which contains both quota and period.
-    
-    * "cpu.rt_runtime_us" and "cpu.rt_period_us" are replaced by
-      "cpu.rt.max" which contains both runtime and period.
-    
-    v2: cpu_stats_show() was incorrectly using CONFIG_FAIR_GROUP_SCHED for
-        CFS bandwidth stats and also using raw division for u64.  Use
-        CONFIG_CFS_BANDWITH and do_div() instead.
-    
-        The semantics of "cpu.rt.max" is not fully decided yet.  Dropped
-        for now.
-    
-    Signed-off-by: Tejun Heo <tj@kernel.org>
-    Cc: Ingo Molnar <mingo@redhat.com>
-    Cc: Peter Zijlstra <peterz@infradead.org>
-    Cc: Li Zefan <lizefan@huawei.com>
-    Cc: Johannes Weiner <hannes@cmpxchg.org>
-
-diff --git a/kernel/sched/core.c b/kernel/sched/core.c
-index 77f3ddd..7aafe63 100644
---- a/kernel/sched/core.c
-+++ b/kernel/sched/core.c
-@@ -8591,6 +8591,139 @@ static struct cftype cpu_legacy_files[] = {
- 	{ }	/* terminate */
- };
- 
-+static int cpu_stats_show(struct seq_file *sf, void *v)
-+{
-+	cpuacct_cpu_stats_show(sf);
-+
-+#ifdef CONFIG_CFS_BANDWIDTH
-+	{
-+		struct task_group *tg = css_tg(seq_css(sf));
-+		struct cfs_bandwidth *cfs_b = &tg->cfs_bandwidth;
-+		u64 throttled_usec;
-+
-+		throttled_usec = cfs_b->throttled_time;
-+		do_div(throttled_usec, NSEC_PER_USEC);
-+
-+		seq_printf(sf, "nr_periods %d\n"
-+			   "nr_throttled %d\n"
-+			   "throttled_usec %llu\n",
-+			   cfs_b->nr_periods, cfs_b->nr_throttled,
-+			   throttled_usec);
-+	}
-+#endif
-+	return 0;
-+}
-+
-+#ifdef CONFIG_FAIR_GROUP_SCHED
-+static u64 cpu_weight_read_u64(struct cgroup_subsys_state *css,
-+			       struct cftype *cft)
-+{
-+	struct task_group *tg = css_tg(css);
-+	u64 weight = scale_load_down(tg->shares);
-+
-+	return DIV_ROUND_CLOSEST_ULL(weight * CGROUP_WEIGHT_DFL, 1024);
-+}
-+
-+static int cpu_weight_write_u64(struct cgroup_subsys_state *css,
-+				struct cftype *cftype, u64 weight)
-+{
-+	/*
-+	 * cgroup weight knobs should use the common MIN, DFL and MAX
-+	 * values which are 1, 100 and 10000 respectively.  While it loses
-+	 * a bit of range on both ends, it maps pretty well onto the shares
-+	 * value used by scheduler and the round-trip conversions preserve
-+	 * the original value over the entire range.
-+	 */
-+	if (weight < CGROUP_WEIGHT_MIN || weight > CGROUP_WEIGHT_MAX)
-+		return -ERANGE;
-+
-+	weight = DIV_ROUND_CLOSEST_ULL(weight * 1024, CGROUP_WEIGHT_DFL);
-+
-+	return sched_group_set_shares(css_tg(css), scale_load(weight));
-+}
-+#endif
-+
-+static void __maybe_unused cpu_period_quota_print(struct seq_file *sf,
-+						  long period, long quota)
-+{
-+	if (quota < 0)
-+		seq_puts(sf, "max");
-+	else
-+		seq_printf(sf, "%ld", quota);
-+
-+	seq_printf(sf, " %ld\n", period);
-+}
-+
-+/* caller should put the current value in *@periodp before calling */
-+static int __maybe_unused cpu_period_quota_parse(char *buf,
-+						 u64 *periodp, u64 *quotap)
-+{
-+	char tok[21];	/* U64_MAX */
-+
-+	if (!sscanf(buf, "%s %llu", tok, periodp))
-+		return -EINVAL;
-+
-+	*periodp *= NSEC_PER_USEC;
-+
-+	if (sscanf(tok, "%llu", quotap))
-+		*quotap *= NSEC_PER_USEC;
-+	else if (!strcmp(tok, "max"))
-+		*quotap = RUNTIME_INF;
-+	else
-+		return -EINVAL;
-+
-+	return 0;
-+}
-+
-+#ifdef CONFIG_CFS_BANDWIDTH
-+static int cpu_max_show(struct seq_file *sf, void *v)
-+{
-+	struct task_group *tg = css_tg(seq_css(sf));
-+
-+	cpu_period_quota_print(sf, tg_get_cfs_period(tg), tg_get_cfs_quota(tg));
-+	return 0;
-+}
-+
-+static ssize_t cpu_max_write(struct kernfs_open_file *of,
-+			     char *buf, size_t nbytes, loff_t off)
-+{
-+	struct task_group *tg = css_tg(of_css(of));
-+	u64 period = tg_get_cfs_period(tg);
-+	u64 quota;
-+	int ret;
-+
-+	ret = cpu_period_quota_parse(buf, &period, &quota);
-+	if (!ret)
-+		ret = tg_set_cfs_bandwidth(tg, period, quota);
-+	return ret ?: nbytes;
-+}
-+#endif
-+
-+static struct cftype cpu_files[] = {
-+	{
-+		.name = "stat",
-+		.flags = CFTYPE_NOT_ON_ROOT,
-+		.seq_show = cpu_stats_show,
-+	},
-+#ifdef CONFIG_FAIR_GROUP_SCHED
-+	{
-+		.name = "weight",
-+		.flags = CFTYPE_NOT_ON_ROOT,
-+		.read_u64 = cpu_weight_read_u64,
-+		.write_u64 = cpu_weight_write_u64,
-+	},
-+#endif
-+#ifdef CONFIG_CFS_BANDWIDTH
-+	{
-+		.name = "max",
-+		.flags = CFTYPE_NOT_ON_ROOT,
-+		.seq_show = cpu_max_show,
-+		.write = cpu_max_write,
-+	},
-+#endif
-+	{ }	/* terminate */
-+};
-+
- struct cgroup_subsys cpu_cgrp_subsys = {
- 	.css_alloc	= cpu_cgroup_css_alloc,
- 	.css_free	= cpu_cgroup_css_free,
-@@ -8600,7 +8733,15 @@ struct cgroup_subsys cpu_cgrp_subsys = {
- 	.can_attach	= cpu_cgroup_can_attach,
- 	.attach		= cpu_cgroup_attach,
- 	.legacy_cftypes	= cpu_legacy_files,
-+	.dfl_cftypes	= cpu_files,
- 	.early_init	= 1,
-+#ifdef CONFIG_CGROUP_CPUACCT
-+	/*
-+	 * cpuacct is enabled together with cpu on the unified hierarchy
-+	 * and its stats are reported through "cpu.stat".
-+	 */
-+	.depends_on	= 1 << cpuacct_cgrp_id,
-+#endif
- };
- 
- #endif	/* CONFIG_CGROUP_SCHED */
-diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
-index 42b2dd5..b4d32a6 100644
---- a/kernel/sched/cpuacct.c
-+++ b/kernel/sched/cpuacct.c
-@@ -224,6 +224,30 @@ static struct cftype files[] = {
- 	{ }	/* terminate */
- };
- 
-+/* used to print cpuacct stats in cpu.stat on the unified hierarchy */
-+void cpuacct_cpu_stats_show(struct seq_file *sf)
-+{
-+	struct cgroup_subsys_state *css;
-+	u64 usage, user, sys;
-+
-+	css = cgroup_get_e_css(seq_css(sf)->cgroup, &cpuacct_cgrp_subsys);
-+
-+	usage = cpuusage_read(css, seq_cft(sf));
-+	cpuacct_stats_read(css_ca(css), &user, &sys);
-+
-+	user *= TICK_NSEC;
-+	sys *= TICK_NSEC;
-+	do_div(usage, NSEC_PER_USEC);
-+	do_div(user, NSEC_PER_USEC);
-+	do_div(sys, NSEC_PER_USEC);
-+
-+	seq_printf(sf, "usage_usec %llu\n"
-+		   "user_usec %llu\n"
-+		   "system_usec %llu\n", usage, user, sys);
-+
-+	css_put(css);
-+}
-+
- /*
-  * charge this task's execution time to its accounting group.
-  *
-diff --git a/kernel/sched/cpuacct.h b/kernel/sched/cpuacct.h
-index ed60562..44eace9 100644
---- a/kernel/sched/cpuacct.h
-+++ b/kernel/sched/cpuacct.h
-@@ -2,6 +2,7 @@
- 
- extern void cpuacct_charge(struct task_struct *tsk, u64 cputime);
- extern void cpuacct_account_field(struct task_struct *p, int index, u64 val);
-+extern void cpuacct_cpu_stats_show(struct seq_file *sf);
- 
- #else
- 
-@@ -14,4 +15,8 @@ cpuacct_account_field(struct task_struct *p, int index, u64 val)
- {
- }
- 
-+static inline void cpuacct_cpu_stats_show(struct seq_file *sf)
-+{
-+}
-+
- #endif
diff --git a/pkgs/os-specific/linux/kernel/linux-4.4.nix b/pkgs/os-specific/linux/kernel/linux-4.4.nix
deleted file mode 100644
index 9271aa0182e..00000000000
--- a/pkgs/os-specific/linux/kernel/linux-4.4.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{ buildPackages, fetchurl, perl, buildLinux, nixosTests, stdenv, ... } @ args:
-
-buildLinux (args // rec {
-  version = "4.4.302";
-  extraMeta.branch = "4.4";
-  extraMeta.broken = stdenv.isAarch64;
-
-  src = fetchurl {
-    url = "mirror://kernel/linux/kernel/v4.x/linux-${version}.tar.xz";
-    sha256 = "1cvnydc7y5xrb1c4yfmsl846dd1jfrr7xf62gxbhnkk01fs7n09m";
-  };
-} // (args.argsOverride or {}))