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authorLinus Torvalds <torvalds@linux-foundation.org>2023-11-02 20:53:31 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2023-11-02 20:53:31 -1000
commit8f6f76a6a29f36d2f3e4510d0bde5046672f6924 (patch)
tree41e31fd924728d6bec5078db0f95b10dec5e5b6e /kernel
parentecae0bd5173b1014f95a14a8dfbe40ec10367dcf (diff)
parent6620999f0d41e4fd6f047727936a964c3399d249 (diff)
Merge tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton: "As usual, lots of singleton and doubleton patches all over the tree and there's little I can say which isn't in the individual changelogs. The lengthier patch series are - 'kdump: use generic functions to simplify crashkernel reservation in arch', from Baoquan He. This is mainly cleanups and consolidation of the 'crashkernel=' kernel parameter handling - After much discussion, David Laight's 'minmax: Relax type checks in min() and max()' is here. Hopefully reduces some typecasting and the use of min_t() and max_t() - A group of patches from Oleg Nesterov which clean up and slightly fix our handling of reads from /proc/PID/task/... and which remove task_struct.thread_group" * tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (64 commits) scripts/gdb/vmalloc: disable on no-MMU scripts/gdb: fix usage of MOD_TEXT not defined when CONFIG_MODULES=n .mailmap: add address mapping for Tomeu Vizoso mailmap: update email address for Claudiu Beznea tools/testing/selftests/mm/run_vmtests.sh: lower the ptrace permissions .mailmap: map Benjamin Poirier's address scripts/gdb: add lx_current support for riscv ocfs2: fix a spelling typo in comment proc: test ProtectionKey in proc-empty-vm test proc: fix proc-empty-vm test with vsyscall fs/proc/base.c: remove unneeded semicolon do_io_accounting: use sig->stats_lock do_io_accounting: use __for_each_thread() ocfs2: replace BUG_ON() at ocfs2_num_free_extents() with ocfs2_error() ocfs2: fix a typo in a comment scripts/show_delta: add __main__ judgement before main code treewide: mark stuff as __ro_after_init fs: ocfs2: check status values proc: test /proc/${pid}/statm compiler.h: move __is_constexpr() to compiler.h ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/Kconfig.kexec2
-rw-r--r--kernel/audit_tree.c4
-rw-r--r--kernel/crash_core.c184
-rw-r--r--kernel/exit.c1
-rw-r--r--kernel/fork.c3
-rw-r--r--kernel/gcov/fs.c2
-rw-r--r--kernel/irq/manage.c15
-rw-r--r--kernel/kexec_core.c17
-rw-r--r--kernel/kthread.c18
-rw-r--r--kernel/panic.c22
-rw-r--r--kernel/pid_namespace.c6
-rw-r--r--kernel/sched/core.c2
-rw-r--r--kernel/signal.c24
-rw-r--r--kernel/smpboot.c3
-rw-r--r--kernel/sys.c41
-rw-r--r--kernel/taskstats.c5
-rw-r--r--kernel/user_namespace.c2
-rw-r--r--kernel/workqueue.c16
18 files changed, 250 insertions, 117 deletions
diff --git a/kernel/Kconfig.kexec b/kernel/Kconfig.kexec
index 9bfe68fe9676..7aff28ded2f4 100644
--- a/kernel/Kconfig.kexec
+++ b/kernel/Kconfig.kexec
@@ -110,7 +110,7 @@ config CRASH_DUMP
For more details see Documentation/admin-guide/kdump/kdump.rst
For s390, this option also enables zfcpdump.
- See also <file:Documentation/s390/zfcpdump.rst>
+ See also <file:Documentation/arch/s390/zfcpdump.rst>
config CRASH_HOTPLUG
bool "Update the crash elfcorehdr on system configuration changes"
diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c
index 85a5b306733b..1b07e6f12a07 100644
--- a/kernel/audit_tree.c
+++ b/kernel/audit_tree.c
@@ -87,8 +87,8 @@ static struct task_struct *prune_thread;
* that makes a difference. Some.
*/
-static struct fsnotify_group *audit_tree_group;
-static struct kmem_cache *audit_tree_mark_cachep __read_mostly;
+static struct fsnotify_group *audit_tree_group __ro_after_init;
+static struct kmem_cache *audit_tree_mark_cachep __ro_after_init;
static struct audit_tree *alloc_tree(const char *s)
{
diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index 2f675ef045d4..efe87d501c8c 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -5,7 +5,6 @@
*/
#include <linux/buildid.h>
-#include <linux/crash_core.h>
#include <linux/init.h>
#include <linux/utsname.h>
#include <linux/vmalloc.h>
@@ -13,6 +12,9 @@
#include <linux/kexec.h>
#include <linux/memory.h>
#include <linux/cpuhotplug.h>
+#include <linux/memblock.h>
+#include <linux/kexec.h>
+#include <linux/kmemleak.h>
#include <asm/page.h>
#include <asm/sections.h>
@@ -33,6 +35,22 @@ u32 *vmcoreinfo_note;
/* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
static unsigned char *vmcoreinfo_data_safecopy;
+/* Location of the reserved area for the crash kernel */
+struct resource crashk_res = {
+ .name = "Crash kernel",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
+ .desc = IORES_DESC_CRASH_KERNEL
+};
+struct resource crashk_low_res = {
+ .name = "Crash kernel",
+ .start = 0,
+ .end = 0,
+ .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
+ .desc = IORES_DESC_CRASH_KERNEL
+};
+
/*
* parsing the "crashkernel" commandline
*
@@ -248,11 +266,11 @@ static int __init __parse_crashkernel(char *cmdline,
unsigned long long system_ram,
unsigned long long *crash_size,
unsigned long long *crash_base,
- const char *name,
const char *suffix)
{
char *first_colon, *first_space;
char *ck_cmdline;
+ char *name = "crashkernel=";
BUG_ON(!crash_size || !crash_base);
*crash_size = 0;
@@ -283,32 +301,53 @@ static int __init __parse_crashkernel(char *cmdline,
/*
* That function is the entry point for command line parsing and should be
* called from the arch-specific code.
+ *
+ * If crashkernel=,high|low is supported on architecture, non-NULL values
+ * should be passed to parameters 'low_size' and 'high'.
*/
int __init parse_crashkernel(char *cmdline,
unsigned long long system_ram,
unsigned long long *crash_size,
- unsigned long long *crash_base)
+ unsigned long long *crash_base,
+ unsigned long long *low_size,
+ bool *high)
{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", NULL);
-}
+ int ret;
-int __init parse_crashkernel_high(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
-}
+ /* crashkernel=X[@offset] */
+ ret = __parse_crashkernel(cmdline, system_ram, crash_size,
+ crash_base, NULL);
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+ /*
+ * If non-NULL 'high' passed in and no normal crashkernel
+ * setting detected, try parsing crashkernel=,high|low.
+ */
+ if (high && ret == -ENOENT) {
+ ret = __parse_crashkernel(cmdline, 0, crash_size,
+ crash_base, suffix_tbl[SUFFIX_HIGH]);
+ if (ret || !*crash_size)
+ return -EINVAL;
-int __init parse_crashkernel_low(char *cmdline,
- unsigned long long system_ram,
- unsigned long long *crash_size,
- unsigned long long *crash_base)
-{
- return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
- "crashkernel=", suffix_tbl[SUFFIX_LOW]);
+ /*
+ * crashkernel=Y,low can be specified or not, but invalid value
+ * is not allowed.
+ */
+ ret = __parse_crashkernel(cmdline, 0, low_size,
+ crash_base, suffix_tbl[SUFFIX_LOW]);
+ if (ret == -ENOENT) {
+ *low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ ret = 0;
+ } else if (ret) {
+ return ret;
+ }
+
+ *high = true;
+ }
+#endif
+ if (!*crash_size)
+ ret = -EINVAL;
+
+ return ret;
}
/*
@@ -321,6 +360,109 @@ static int __init parse_crashkernel_dummy(char *arg)
}
early_param("crashkernel", parse_crashkernel_dummy);
+#ifdef CONFIG_ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATION
+static int __init reserve_crashkernel_low(unsigned long long low_size)
+{
+#ifdef CONFIG_64BIT
+ unsigned long long low_base;
+
+ low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
+ if (!low_base) {
+ pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size);
+ return -ENOMEM;
+ }
+
+ pr_info("crashkernel low memory reserved: 0x%08llx - 0x%08llx (%lld MB)\n",
+ low_base, low_base + low_size, low_size >> 20);
+
+ crashk_low_res.start = low_base;
+ crashk_low_res.end = low_base + low_size - 1;
+ insert_resource(&iomem_resource, &crashk_low_res);
+#endif
+ return 0;
+}
+
+void __init reserve_crashkernel_generic(char *cmdline,
+ unsigned long long crash_size,
+ unsigned long long crash_base,
+ unsigned long long crash_low_size,
+ bool high)
+{
+ unsigned long long search_end = CRASH_ADDR_LOW_MAX, search_base = 0;
+ bool fixed_base = false;
+
+ /* User specifies base address explicitly. */
+ if (crash_base) {
+ fixed_base = true;
+ search_base = crash_base;
+ search_end = crash_base + crash_size;
+ } else if (high) {
+ search_base = CRASH_ADDR_LOW_MAX;
+ search_end = CRASH_ADDR_HIGH_MAX;
+ }
+
+retry:
+ crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
+ search_base, search_end);
+ if (!crash_base) {
+ /*
+ * For crashkernel=size[KMG]@offset[KMG], print out failure
+ * message if can't reserve the specified region.
+ */
+ if (fixed_base) {
+ pr_warn("crashkernel reservation failed - memory is in use.\n");
+ return;
+ }
+
+ /*
+ * For crashkernel=size[KMG], if the first attempt was for
+ * low memory, fall back to high memory, the minimum required
+ * low memory will be reserved later.
+ */
+ if (!high && search_end == CRASH_ADDR_LOW_MAX) {
+ search_end = CRASH_ADDR_HIGH_MAX;
+ search_base = CRASH_ADDR_LOW_MAX;
+ crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE;
+ goto retry;
+ }
+
+ /*
+ * For crashkernel=size[KMG],high, if the first attempt was
+ * for high memory, fall back to low memory.
+ */
+ if (high && search_end == CRASH_ADDR_HIGH_MAX) {
+ search_end = CRASH_ADDR_LOW_MAX;
+ search_base = 0;
+ goto retry;
+ }
+ pr_warn("cannot allocate crashkernel (size:0x%llx)\n",
+ crash_size);
+ return;
+ }
+
+ if ((crash_base > CRASH_ADDR_LOW_MAX) &&
+ crash_low_size && reserve_crashkernel_low(crash_low_size)) {
+ memblock_phys_free(crash_base, crash_size);
+ return;
+ }
+
+ pr_info("crashkernel reserved: 0x%016llx - 0x%016llx (%lld MB)\n",
+ crash_base, crash_base + crash_size, crash_size >> 20);
+
+ /*
+ * The crashkernel memory will be removed from the kernel linear
+ * map. Inform kmemleak so that it won't try to access it.
+ */
+ kmemleak_ignore_phys(crash_base);
+ if (crashk_low_res.end)
+ kmemleak_ignore_phys(crashk_low_res.start);
+
+ crashk_res.start = crash_base;
+ crashk_res.end = crash_base + crash_size - 1;
+ insert_resource(&iomem_resource, &crashk_res);
+}
+#endif
+
int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
void **addr, unsigned long *sz)
{
diff --git a/kernel/exit.c b/kernel/exit.c
index 61ebba96909b..ee9f43bed49a 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -135,7 +135,6 @@ static void __unhash_process(struct task_struct *p, bool group_dead)
list_del_init(&p->sibling);
__this_cpu_dec(process_counts);
}
- list_del_rcu(&p->thread_group);
list_del_rcu(&p->thread_node);
}
diff --git a/kernel/fork.c b/kernel/fork.c
index 373fa2f739bc..10917c3e1f03 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2577,7 +2577,6 @@ __latent_entropy struct task_struct *copy_process(
p->dirty_paused_when = 0;
p->pdeath_signal = 0;
- INIT_LIST_HEAD(&p->thread_group);
p->task_works = NULL;
clear_posix_cputimers_work(p);
@@ -2705,8 +2704,6 @@ __latent_entropy struct task_struct *copy_process(
atomic_inc(&current->signal->live);
refcount_inc(&current->signal->sigcnt);
task_join_group_stop(p);
- list_add_tail_rcu(&p->thread_group,
- &p->group_leader->thread_group);
list_add_tail_rcu(&p->thread_node,
&p->signal->thread_head);
}
diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c
index 5c3086cad8f9..01520689b57c 100644
--- a/kernel/gcov/fs.c
+++ b/kernel/gcov/fs.c
@@ -99,7 +99,7 @@ struct gcov_iterator {
struct gcov_info *info;
size_t size;
loff_t pos;
- char buffer[];
+ char buffer[] __counted_by(size);
};
/**
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index d309ba84e08a..1782f90cd8c6 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1852,15 +1852,13 @@ out_thread:
struct task_struct *t = new->thread;
new->thread = NULL;
- kthread_stop(t);
- put_task_struct(t);
+ kthread_stop_put(t);
}
if (new->secondary && new->secondary->thread) {
struct task_struct *t = new->secondary->thread;
new->secondary->thread = NULL;
- kthread_stop(t);
- put_task_struct(t);
+ kthread_stop_put(t);
}
out_mput:
module_put(desc->owner);
@@ -1971,12 +1969,9 @@ static struct irqaction *__free_irq(struct irq_desc *desc, void *dev_id)
* the same bit to a newly requested action.
*/
if (action->thread) {
- kthread_stop(action->thread);
- put_task_struct(action->thread);
- if (action->secondary && action->secondary->thread) {
- kthread_stop(action->secondary->thread);
- put_task_struct(action->secondary->thread);
- }
+ kthread_stop_put(action->thread);
+ if (action->secondary && action->secondary->thread)
+ kthread_stop_put(action->secondary->thread);
}
/* Last action releases resources */
diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 9dc728982d79..be5642a4ec49 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -52,23 +52,6 @@ atomic_t __kexec_lock = ATOMIC_INIT(0);
/* Flag to indicate we are going to kexec a new kernel */
bool kexec_in_progress = false;
-
-/* Location of the reserved area for the crash kernel */
-struct resource crashk_res = {
- .name = "Crash kernel",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
- .desc = IORES_DESC_CRASH_KERNEL
-};
-struct resource crashk_low_res = {
- .name = "Crash kernel",
- .start = 0,
- .end = 0,
- .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
- .desc = IORES_DESC_CRASH_KERNEL
-};
-
int kexec_should_crash(struct task_struct *p)
{
/*
diff --git a/kernel/kthread.c b/kernel/kthread.c
index c46128ec0c0a..c5e40830c1f2 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -715,6 +715,24 @@ int kthread_stop(struct task_struct *k)
}
EXPORT_SYMBOL(kthread_stop);
+/**
+ * kthread_stop_put - stop a thread and put its task struct
+ * @k: thread created by kthread_create().
+ *
+ * Stops a thread created by kthread_create() and put its task_struct.
+ * Only use when holding an extra task struct reference obtained by
+ * calling get_task_struct().
+ */
+int kthread_stop_put(struct task_struct *k)
+{
+ int ret;
+
+ ret = kthread_stop(k);
+ put_task_struct(k);
+ return ret;
+}
+EXPORT_SYMBOL(kthread_stop_put);
+
int kthreadd(void *unused)
{
struct task_struct *tsk = current;
diff --git a/kernel/panic.c b/kernel/panic.c
index ffa037fa777d..2807639aab51 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -192,14 +192,15 @@ atomic_t panic_cpu = ATOMIC_INIT(PANIC_CPU_INVALID);
*/
void nmi_panic(struct pt_regs *regs, const char *msg)
{
- int old_cpu, cpu;
+ int old_cpu, this_cpu;
- cpu = raw_smp_processor_id();
- old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, cpu);
+ old_cpu = PANIC_CPU_INVALID;
+ this_cpu = raw_smp_processor_id();
- if (old_cpu == PANIC_CPU_INVALID)
+ /* atomic_try_cmpxchg updates old_cpu on failure */
+ if (atomic_try_cmpxchg(&panic_cpu, &old_cpu, this_cpu))
panic("%s", msg);
- else if (old_cpu != cpu)
+ else if (old_cpu != this_cpu)
nmi_panic_self_stop(regs);
}
EXPORT_SYMBOL(nmi_panic);
@@ -311,15 +312,18 @@ void panic(const char *fmt, ...)
* stop themself or will wait until they are stopped by the 1st CPU
* with smp_send_stop().
*
- * `old_cpu == PANIC_CPU_INVALID' means this is the 1st CPU which
- * comes here, so go ahead.
+ * cmpxchg success means this is the 1st CPU which comes here,
+ * so go ahead.
* `old_cpu == this_cpu' means we came from nmi_panic() which sets
* panic_cpu to this CPU. In this case, this is also the 1st CPU.
*/
+ old_cpu = PANIC_CPU_INVALID;
this_cpu = raw_smp_processor_id();
- old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);
- if (old_cpu != PANIC_CPU_INVALID && old_cpu != this_cpu)
+ /* atomic_try_cmpxchg updates old_cpu on failure */
+ if (atomic_try_cmpxchg(&panic_cpu, &old_cpu, this_cpu)) {
+ /* go ahead */
+ } else if (old_cpu != this_cpu)
panic_smp_self_stop();
console_verbose();
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 619972c78774..3028b2218aa4 100644
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -286,12 +286,6 @@ static int pid_ns_ctl_handler(struct ctl_table *table, int write,
if (write && !checkpoint_restore_ns_capable(pid_ns->user_ns))
return -EPERM;
- /*
- * Writing directly to ns' last_pid field is OK, since this field
- * is volatile in a living namespace anyway and a code writing to
- * it should synchronize its usage with external means.
- */
-
next = idr_get_cursor(&pid_ns->idr) - 1;
tmp.data = &next;
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3d7e2d702699..a708d225c28e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9869,7 +9869,7 @@ struct task_group root_task_group;
LIST_HEAD(task_groups);
/* Cacheline aligned slab cache for task_group */
-static struct kmem_cache *task_group_cache __read_mostly;
+static struct kmem_cache *task_group_cache __ro_after_init;
#endif
void __init sched_init(void)
diff --git a/kernel/signal.c b/kernel/signal.c
index 83fcbaf0e82d..47a7602dfe8d 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -415,7 +415,7 @@ __sigqueue_alloc(int sig, struct task_struct *t, gfp_t gfp_flags,
int override_rlimit, const unsigned int sigqueue_flags)
{
struct sigqueue *q = NULL;
- struct ucounts *ucounts = NULL;
+ struct ucounts *ucounts;
long sigpending;
/*
@@ -1058,12 +1058,11 @@ static void complete_signal(int sig, struct task_struct *p, enum pid_type type)
signal->flags = SIGNAL_GROUP_EXIT;
signal->group_exit_code = sig;
signal->group_stop_count = 0;
- t = p;
- do {
+ __for_each_thread(signal, t) {
task_clear_jobctl_pending(t, JOBCTL_PENDING_MASK);
sigaddset(&t->pending.signal, SIGKILL);
signal_wake_up(t, 1);
- } while_each_thread(p, t);
+ }
return;
}
}
@@ -1471,16 +1470,21 @@ int group_send_sig_info(int sig, struct kernel_siginfo *info,
int __kill_pgrp_info(int sig, struct kernel_siginfo *info, struct pid *pgrp)
{
struct task_struct *p = NULL;
- int retval, success;
+ int ret = -ESRCH;
- success = 0;
- retval = -ESRCH;
do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
int err = group_send_sig_info(sig, info, p, PIDTYPE_PGID);
- success |= !err;
- retval = err;
+ /*
+ * If group_send_sig_info() succeeds at least once ret
+ * becomes 0 and after that the code below has no effect.
+ * Otherwise we return the last err or -ESRCH if this
+ * process group is empty.
+ */
+ if (ret)
+ ret = err;
} while_each_pid_task(pgrp, PIDTYPE_PGID, p);
- return success ? 0 : retval;
+
+ return ret;
}
int kill_pid_info(int sig, struct kernel_siginfo *info, struct pid *pid)
diff --git a/kernel/smpboot.c b/kernel/smpboot.c
index f47d8f375946..1992b62e980b 100644
--- a/kernel/smpboot.c
+++ b/kernel/smpboot.c
@@ -272,8 +272,7 @@ static void smpboot_destroy_threads(struct smp_hotplug_thread *ht)
struct task_struct *tsk = *per_cpu_ptr(ht->store, cpu);
if (tsk) {
- kthread_stop(tsk);
- put_task_struct(tsk);
+ kthread_stop_put(tsk);
*per_cpu_ptr(ht->store, cpu) = NULL;
}
}
diff --git a/kernel/sys.c b/kernel/sys.c
index 4a8073c1b255..420d9cb9cc8e 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1786,6 +1786,7 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
unsigned long flags;
u64 tgutime, tgstime, utime, stime;
unsigned long maxrss = 0;
+ struct signal_struct *sig = p->signal;
memset((char *)r, 0, sizeof (*r));
utime = stime = 0;
@@ -1793,7 +1794,7 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
if (who == RUSAGE_THREAD) {
task_cputime_adjusted(current, &utime, &stime);
accumulate_thread_rusage(p, r);
- maxrss = p->signal->maxrss;
+ maxrss = sig->maxrss;
goto out;
}
@@ -1803,15 +1804,15 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
switch (who) {
case RUSAGE_BOTH:
case RUSAGE_CHILDREN:
- utime = p->signal->cutime;
- stime = p->signal->cstime;
- r->ru_nvcsw = p->signal->cnvcsw;
- r->ru_nivcsw = p->signal->cnivcsw;
- r->ru_minflt = p->signal->cmin_flt;
- r->ru_majflt = p->signal->cmaj_flt;
- r->ru_inblock = p->signal->cinblock;
- r->ru_oublock = p->signal->coublock;
- maxrss = p->signal->cmaxrss;
+ utime = sig->cutime;
+ stime = sig->cstime;
+ r->ru_nvcsw = sig->cnvcsw;
+ r->ru_nivcsw = sig->cnivcsw;
+ r->ru_minflt = sig->cmin_flt;
+ r->ru_majflt = sig->cmaj_flt;
+ r->ru_inblock = sig->cinblock;
+ r->ru_oublock = sig->coublock;
+ maxrss = sig->cmaxrss;
if (who == RUSAGE_CHILDREN)
break;
@@ -1821,18 +1822,16 @@ void getrusage(struct task_struct *p, int who, struct rusage *r)
thread_group_cputime_adjusted(p, &tgutime, &tgstime);
utime += tgutime;
stime += tgstime;
- r->ru_nvcsw += p->signal->nvcsw;
- r->ru_nivcsw += p->signal->nivcsw;
- r->ru_minflt += p->signal->min_flt;
- r->ru_majflt += p->signal->maj_flt;
- r->ru_inblock += p->signal->inblock;
- r->ru_oublock += p->signal->oublock;
- if (maxrss < p->signal->maxrss)
- maxrss = p->signal->maxrss;
- t = p;
- do {
+ r->ru_nvcsw += sig->nvcsw;
+ r->ru_nivcsw += sig->nivcsw;
+ r->ru_minflt += sig->min_flt;
+ r->ru_majflt += sig->maj_flt;
+ r->ru_inblock += sig->inblock;
+ r->ru_oublock += sig->oublock;
+ if (maxrss < sig->maxrss)
+ maxrss = sig->maxrss;
+ __for_each_thread(sig, t)
accumulate_thread_rusage(t, r);
- } while_each_thread(p, t);
break;
default:
diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 8ce3fa0c19e2..4354ea231fab 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -233,9 +233,8 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
else
memset(stats, 0, sizeof(*stats));
- tsk = first;
start_time = ktime_get_ns();
- do {
+ for_each_thread(first, tsk) {
if (tsk->exit_state)
continue;
/*
@@ -258,7 +257,7 @@ static int fill_stats_for_tgid(pid_t tgid, struct taskstats *stats)
stats->nvcsw += tsk->nvcsw;
stats->nivcsw += tsk->nivcsw;
- } while_each_thread(first, tsk);
+ }
unlock_task_sighand(first, &flags);
rc = 0;
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index d52a894ecf57..eabe8bcc7042 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -22,7 +22,7 @@
#include <linux/bsearch.h>
#include <linux/sort.h>
-static struct kmem_cache *user_ns_cachep __read_mostly;
+static struct kmem_cache *user_ns_cachep __ro_after_init;
static DEFINE_MUTEX(userns_state_mutex);
static bool new_idmap_permitted(const struct file *file,
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0f682da96e1c..6e578f576a6f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -418,21 +418,21 @@ static struct workqueue_attrs *ordered_wq_attrs[NR_STD_WORKER_POOLS];
* process context while holding a pool lock. Bounce to a dedicated kthread
* worker to avoid A-A deadlocks.
*/
-static struct kthread_worker *pwq_release_worker;
+static struct kthread_worker *pwq_release_worker __ro_after_init;
-struct workqueue_struct *system_wq __read_mostly;
+struct workqueue_struct *system_wq __ro_after_init;
EXPORT_SYMBOL(system_wq);
-struct workqueue_struct *system_highpri_wq __read_mostly;
+struct workqueue_struct *system_highpri_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_highpri_wq);
-struct workqueue_struct *system_long_wq __read_mostly;
+struct workqueue_struct *system_long_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_long_wq);
-struct workqueue_struct *system_unbound_wq __read_mostly;
+struct workqueue_struct *system_unbound_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_unbound_wq);
-struct workqueue_struct *system_freezable_wq __read_mostly;
+struct workqueue_struct *system_freezable_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_freezable_wq);
-struct workqueue_struct *system_power_efficient_wq __read_mostly;
+struct workqueue_struct *system_power_efficient_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_power_efficient_wq);
-struct workqueue_struct *system_freezable_power_efficient_wq __read_mostly;
+struct workqueue_struct *system_freezable_power_efficient_wq __ro_after_init;
EXPORT_SYMBOL_GPL(system_freezable_power_efficient_wq);
static int worker_thread(void *__worker);