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-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/cpuset.c260
-rw-r--r--kernel/groups.c288
-rw-r--r--kernel/kfifo.c4
-rw-r--r--kernel/kthread.c2
-rw-r--r--kernel/power/process.c5
-rw-r--r--kernel/profile.c8
-rw-r--r--kernel/slow-work.c23
-rw-r--r--kernel/sys.c283
-rw-r--r--kernel/sysctl.c2
10 files changed, 431 insertions, 445 deletions
diff --git a/kernel/Makefile b/kernel/Makefile
index 90b53f6dc226..9df4501cb921 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -11,6 +11,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \ 11 hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \ 12 notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \
13 async.o 13 async.o
14obj-y += groups.o
14 15
15ifdef CONFIG_FUNCTION_TRACER 16ifdef CONFIG_FUNCTION_TRACER
16# Do not trace debug files and internal ftrace files 17# Do not trace debug files and internal ftrace files
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index d5a7e17474ee..7e75a41bd508 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -97,12 +97,6 @@ struct cpuset {
97 97
98 struct cpuset *parent; /* my parent */ 98 struct cpuset *parent; /* my parent */
99 99
100 /*
101 * Copy of global cpuset_mems_generation as of the most
102 * recent time this cpuset changed its mems_allowed.
103 */
104 int mems_generation;
105
106 struct fmeter fmeter; /* memory_pressure filter */ 100 struct fmeter fmeter; /* memory_pressure filter */
107 101
108 /* partition number for rebuild_sched_domains() */ 102 /* partition number for rebuild_sched_domains() */
@@ -176,27 +170,6 @@ static inline int is_spread_slab(const struct cpuset *cs)
176 return test_bit(CS_SPREAD_SLAB, &cs->flags); 170 return test_bit(CS_SPREAD_SLAB, &cs->flags);
177} 171}
178 172
179/*
180 * Increment this integer everytime any cpuset changes its
181 * mems_allowed value. Users of cpusets can track this generation
182 * number, and avoid having to lock and reload mems_allowed unless
183 * the cpuset they're using changes generation.
184 *
185 * A single, global generation is needed because cpuset_attach_task() could
186 * reattach a task to a different cpuset, which must not have its
187 * generation numbers aliased with those of that tasks previous cpuset.
188 *
189 * Generations are needed for mems_allowed because one task cannot
190 * modify another's memory placement. So we must enable every task,
191 * on every visit to __alloc_pages(), to efficiently check whether
192 * its current->cpuset->mems_allowed has changed, requiring an update
193 * of its current->mems_allowed.
194 *
195 * Since writes to cpuset_mems_generation are guarded by the cgroup lock
196 * there is no need to mark it atomic.
197 */
198static int cpuset_mems_generation;
199
200static struct cpuset top_cpuset = { 173static struct cpuset top_cpuset = {
201 .flags = ((1 << CS_CPU_EXCLUSIVE) | (1 << CS_MEM_EXCLUSIVE)), 174 .flags = ((1 << CS_CPU_EXCLUSIVE) | (1 << CS_MEM_EXCLUSIVE)),
202}; 175};
@@ -228,8 +201,9 @@ static struct cpuset top_cpuset = {
228 * If a task is only holding callback_mutex, then it has read-only 201 * If a task is only holding callback_mutex, then it has read-only
229 * access to cpusets. 202 * access to cpusets.
230 * 203 *
231 * The task_struct fields mems_allowed and mems_generation may only 204 * Now, the task_struct fields mems_allowed and mempolicy may be changed
232 * be accessed in the context of that task, so require no locks. 205 * by other task, we use alloc_lock in the task_struct fields to protect
206 * them.
233 * 207 *
234 * The cpuset_common_file_read() handlers only hold callback_mutex across 208 * The cpuset_common_file_read() handlers only hold callback_mutex across
235 * small pieces of code, such as when reading out possibly multi-word 209 * small pieces of code, such as when reading out possibly multi-word
@@ -331,75 +305,22 @@ static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
331 BUG_ON(!nodes_intersects(*pmask, node_states[N_HIGH_MEMORY])); 305 BUG_ON(!nodes_intersects(*pmask, node_states[N_HIGH_MEMORY]));
332} 306}
333 307
334/** 308/*
335 * cpuset_update_task_memory_state - update task memory placement 309 * update task's spread flag if cpuset's page/slab spread flag is set
336 * 310 *
337 * If the current tasks cpusets mems_allowed changed behind our 311 * Called with callback_mutex/cgroup_mutex held
338 * backs, update current->mems_allowed, mems_generation and task NUMA
339 * mempolicy to the new value.
340 *
341 * Task mempolicy is updated by rebinding it relative to the
342 * current->cpuset if a task has its memory placement changed.
343 * Do not call this routine if in_interrupt().
344 *
345 * Call without callback_mutex or task_lock() held. May be
346 * called with or without cgroup_mutex held. Thanks in part to
347 * 'the_top_cpuset_hack', the task's cpuset pointer will never
348 * be NULL. This routine also might acquire callback_mutex during
349 * call.
350 *
351 * Reading current->cpuset->mems_generation doesn't need task_lock
352 * to guard the current->cpuset derefence, because it is guarded
353 * from concurrent freeing of current->cpuset using RCU.
354 *
355 * The rcu_dereference() is technically probably not needed,
356 * as I don't actually mind if I see a new cpuset pointer but
357 * an old value of mems_generation. However this really only
358 * matters on alpha systems using cpusets heavily. If I dropped
359 * that rcu_dereference(), it would save them a memory barrier.
360 * For all other arch's, rcu_dereference is a no-op anyway, and for
361 * alpha systems not using cpusets, another planned optimization,
362 * avoiding the rcu critical section for tasks in the root cpuset
363 * which is statically allocated, so can't vanish, will make this
364 * irrelevant. Better to use RCU as intended, than to engage in
365 * some cute trick to save a memory barrier that is impossible to
366 * test, for alpha systems using cpusets heavily, which might not
367 * even exist.
368 *
369 * This routine is needed to update the per-task mems_allowed data,
370 * within the tasks context, when it is trying to allocate memory
371 * (in various mm/mempolicy.c routines) and notices that some other
372 * task has been modifying its cpuset.
373 */ 312 */
374 313static void cpuset_update_task_spread_flag(struct cpuset *cs,
375void cpuset_update_task_memory_state(void) 314 struct task_struct *tsk)
376{ 315{
377 int my_cpusets_mem_gen; 316 if (is_spread_page(cs))
378 struct task_struct *tsk = current; 317 tsk->flags |= PF_SPREAD_PAGE;
379 struct cpuset *cs; 318 else
380 319 tsk->flags &= ~PF_SPREAD_PAGE;
381 rcu_read_lock(); 320 if (is_spread_slab(cs))
382 my_cpusets_mem_gen = task_cs(tsk)->mems_generation; 321 tsk->flags |= PF_SPREAD_SLAB;
383 rcu_read_unlock(); 322 else
384 323 tsk->flags &= ~PF_SPREAD_SLAB;
385 if (my_cpusets_mem_gen != tsk->cpuset_mems_generation) {
386 mutex_lock(&callback_mutex);
387 task_lock(tsk);
388 cs = task_cs(tsk); /* Maybe changed when task not locked */
389 guarantee_online_mems(cs, &tsk->mems_allowed);
390 tsk->cpuset_mems_generation = cs->mems_generation;
391 if (is_spread_page(cs))
392 tsk->flags |= PF_SPREAD_PAGE;
393 else
394 tsk->flags &= ~PF_SPREAD_PAGE;
395 if (is_spread_slab(cs))
396 tsk->flags |= PF_SPREAD_SLAB;
397 else
398 tsk->flags &= ~PF_SPREAD_SLAB;
399 task_unlock(tsk);
400 mutex_unlock(&callback_mutex);
401 mpol_rebind_task(tsk, &tsk->mems_allowed);
402 }
403} 324}
404 325
405/* 326/*
@@ -1007,14 +928,6 @@ static int update_cpumask(struct cpuset *cs, struct cpuset *trialcs,
1007 * other task, the task_struct mems_allowed that we are hacking 928 * other task, the task_struct mems_allowed that we are hacking
1008 * is for our current task, which must allocate new pages for that 929 * is for our current task, which must allocate new pages for that
1009 * migrating memory region. 930 * migrating memory region.
1010 *
1011 * We call cpuset_update_task_memory_state() before hacking
1012 * our tasks mems_allowed, so that we are assured of being in
1013 * sync with our tasks cpuset, and in particular, callbacks to
1014 * cpuset_update_task_memory_state() from nested page allocations
1015 * won't see any mismatch of our cpuset and task mems_generation
1016 * values, so won't overwrite our hacked tasks mems_allowed
1017 * nodemask.
1018 */ 931 */
1019 932
1020static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from, 933static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
@@ -1022,22 +935,37 @@ static void cpuset_migrate_mm(struct mm_struct *mm, const nodemask_t *from,
1022{ 935{
1023 struct task_struct *tsk = current; 936 struct task_struct *tsk = current;
1024 937
1025 cpuset_update_task_memory_state();
1026
1027 mutex_lock(&callback_mutex);
1028 tsk->mems_allowed = *to; 938 tsk->mems_allowed = *to;
1029 mutex_unlock(&callback_mutex);
1030 939
1031 do_migrate_pages(mm, from, to, MPOL_MF_MOVE_ALL); 940 do_migrate_pages(mm, from, to, MPOL_MF_MOVE_ALL);
1032 941
1033 mutex_lock(&callback_mutex);
1034 guarantee_online_mems(task_cs(tsk),&tsk->mems_allowed); 942 guarantee_online_mems(task_cs(tsk),&tsk->mems_allowed);
1035 mutex_unlock(&callback_mutex);
1036} 943}
1037 944
1038/* 945/*
1039 * Rebind task's vmas to cpuset's new mems_allowed, and migrate pages to new 946 * cpuset_change_task_nodemask - change task's mems_allowed and mempolicy
1040 * nodes if memory_migrate flag is set. Called with cgroup_mutex held. 947 * @tsk: the task to change
948 * @newmems: new nodes that the task will be set
949 *
950 * In order to avoid seeing no nodes if the old and new nodes are disjoint,
951 * we structure updates as setting all new allowed nodes, then clearing newly
952 * disallowed ones.
953 *
954 * Called with task's alloc_lock held
955 */
956static void cpuset_change_task_nodemask(struct task_struct *tsk,
957 nodemask_t *newmems)
958{
959 nodes_or(tsk->mems_allowed, tsk->mems_allowed, *newmems);
960 mpol_rebind_task(tsk, &tsk->mems_allowed);
961 mpol_rebind_task(tsk, newmems);
962 tsk->mems_allowed = *newmems;
963}
964
965/*
966 * Update task's mems_allowed and rebind its mempolicy and vmas' mempolicy
967 * of it to cpuset's new mems_allowed, and migrate pages to new nodes if
968 * memory_migrate flag is set. Called with cgroup_mutex held.
1041 */ 969 */
1042static void cpuset_change_nodemask(struct task_struct *p, 970static void cpuset_change_nodemask(struct task_struct *p,
1043 struct cgroup_scanner *scan) 971 struct cgroup_scanner *scan)
@@ -1046,12 +974,19 @@ static void cpuset_change_nodemask(struct task_struct *p,
1046 struct cpuset *cs; 974 struct cpuset *cs;
1047 int migrate; 975 int migrate;
1048 const nodemask_t *oldmem = scan->data; 976 const nodemask_t *oldmem = scan->data;
977 nodemask_t newmems;
978
979 cs = cgroup_cs(scan->cg);
980 guarantee_online_mems(cs, &newmems);
981
982 task_lock(p);
983 cpuset_change_task_nodemask(p, &newmems);
984 task_unlock(p);
1049 985
1050 mm = get_task_mm(p); 986 mm = get_task_mm(p);
1051 if (!mm) 987 if (!mm)
1052 return; 988 return;
1053 989
1054 cs = cgroup_cs(scan->cg);
1055 migrate = is_memory_migrate(cs); 990 migrate = is_memory_migrate(cs);
1056 991
1057 mpol_rebind_mm(mm, &cs->mems_allowed); 992 mpol_rebind_mm(mm, &cs->mems_allowed);
@@ -1104,10 +1039,10 @@ static void update_tasks_nodemask(struct cpuset *cs, const nodemask_t *oldmem,
1104/* 1039/*
1105 * Handle user request to change the 'mems' memory placement 1040 * Handle user request to change the 'mems' memory placement
1106 * of a cpuset. Needs to validate the request, update the 1041 * of a cpuset. Needs to validate the request, update the
1107 * cpusets mems_allowed and mems_generation, and for each 1042 * cpusets mems_allowed, and for each task in the cpuset,
1108 * task in the cpuset, rebind any vma mempolicies and if 1043 * update mems_allowed and rebind task's mempolicy and any vma
1109 * the cpuset is marked 'memory_migrate', migrate the tasks 1044 * mempolicies and if the cpuset is marked 'memory_migrate',
1110 * pages to the new memory. 1045 * migrate the tasks pages to the new memory.
1111 * 1046 *
1112 * Call with cgroup_mutex held. May take callback_mutex during call. 1047 * Call with cgroup_mutex held. May take callback_mutex during call.
1113 * Will take tasklist_lock, scan tasklist for tasks in cpuset cs, 1048 * Will take tasklist_lock, scan tasklist for tasks in cpuset cs,
@@ -1160,7 +1095,6 @@ static int update_nodemask(struct cpuset *cs, struct cpuset *trialcs,
1160 1095
1161 mutex_lock(&callback_mutex); 1096 mutex_lock(&callback_mutex);
1162 cs->mems_allowed = trialcs->mems_allowed; 1097 cs->mems_allowed = trialcs->mems_allowed;
1163 cs->mems_generation = cpuset_mems_generation++;
1164 mutex_unlock(&callback_mutex); 1098 mutex_unlock(&callback_mutex);
1165 1099
1166 update_tasks_nodemask(cs, &oldmem, &heap); 1100 update_tasks_nodemask(cs, &oldmem, &heap);
@@ -1193,6 +1127,46 @@ static int update_relax_domain_level(struct cpuset *cs, s64 val)
1193} 1127}
1194 1128
1195/* 1129/*
1130 * cpuset_change_flag - make a task's spread flags the same as its cpuset's
1131 * @tsk: task to be updated
1132 * @scan: struct cgroup_scanner containing the cgroup of the task
1133 *
1134 * Called by cgroup_scan_tasks() for each task in a cgroup.
1135 *
1136 * We don't need to re-check for the cgroup/cpuset membership, since we're
1137 * holding cgroup_lock() at this point.
1138 */
1139static void cpuset_change_flag(struct task_struct *tsk,
1140 struct cgroup_scanner *scan)
1141{
1142 cpuset_update_task_spread_flag(cgroup_cs(scan->cg), tsk);
1143}
1144
1145/*
1146 * update_tasks_flags - update the spread flags of tasks in the cpuset.
1147 * @cs: the cpuset in which each task's spread flags needs to be changed
1148 * @heap: if NULL, defer allocating heap memory to cgroup_scan_tasks()
1149 *
1150 * Called with cgroup_mutex held
1151 *
1152 * The cgroup_scan_tasks() function will scan all the tasks in a cgroup,
1153 * calling callback functions for each.
1154 *
1155 * No return value. It's guaranteed that cgroup_scan_tasks() always returns 0
1156 * if @heap != NULL.
1157 */
1158static void update_tasks_flags(struct cpuset *cs, struct ptr_heap *heap)
1159{
1160 struct cgroup_scanner scan;
1161
1162 scan.cg = cs->css.cgroup;
1163 scan.test_task = NULL;
1164 scan.process_task = cpuset_change_flag;
1165 scan.heap = heap;
1166 cgroup_scan_tasks(&scan);
1167}
1168
1169/*
1196 * update_flag - read a 0 or a 1 in a file and update associated flag 1170 * update_flag - read a 0 or a 1 in a file and update associated flag
1197 * bit: the bit to update (see cpuset_flagbits_t) 1171 * bit: the bit to update (see cpuset_flagbits_t)
1198 * cs: the cpuset to update 1172 * cs: the cpuset to update
@@ -1205,8 +1179,10 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
1205 int turning_on) 1179 int turning_on)
1206{ 1180{
1207 struct cpuset *trialcs; 1181 struct cpuset *trialcs;
1208 int err;
1209 int balance_flag_changed; 1182 int balance_flag_changed;
1183 int spread_flag_changed;
1184 struct ptr_heap heap;
1185 int err;
1210 1186
1211 trialcs = alloc_trial_cpuset(cs); 1187 trialcs = alloc_trial_cpuset(cs);
1212 if (!trialcs) 1188 if (!trialcs)
@@ -1221,9 +1197,16 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
1221 if (err < 0) 1197 if (err < 0)
1222 goto out; 1198 goto out;
1223 1199
1200 err = heap_init(&heap, PAGE_SIZE, GFP_KERNEL, NULL);
1201 if (err < 0)
1202 goto out;
1203
1224 balance_flag_changed = (is_sched_load_balance(cs) != 1204 balance_flag_changed = (is_sched_load_balance(cs) !=
1225 is_sched_load_balance(trialcs)); 1205 is_sched_load_balance(trialcs));
1226 1206
1207 spread_flag_changed = ((is_spread_slab(cs) != is_spread_slab(trialcs))
1208 || (is_spread_page(cs) != is_spread_page(trialcs)));
1209
1227 mutex_lock(&callback_mutex); 1210 mutex_lock(&callback_mutex);
1228 cs->flags = trialcs->flags; 1211 cs->flags = trialcs->flags;
1229 mutex_unlock(&callback_mutex); 1212 mutex_unlock(&callback_mutex);
@@ -1231,6 +1214,9 @@ static int update_flag(cpuset_flagbits_t bit, struct cpuset *cs,
1231 if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed) 1214 if (!cpumask_empty(trialcs->cpus_allowed) && balance_flag_changed)
1232 async_rebuild_sched_domains(); 1215 async_rebuild_sched_domains();
1233 1216
1217 if (spread_flag_changed)
1218 update_tasks_flags(cs, &heap);
1219 heap_free(&heap);
1234out: 1220out:
1235 free_trial_cpuset(trialcs); 1221 free_trial_cpuset(trialcs);
1236 return err; 1222 return err;
@@ -1372,15 +1358,20 @@ static void cpuset_attach(struct cgroup_subsys *ss,
1372 1358
1373 if (cs == &top_cpuset) { 1359 if (cs == &top_cpuset) {
1374 cpumask_copy(cpus_attach, cpu_possible_mask); 1360 cpumask_copy(cpus_attach, cpu_possible_mask);
1361 to = node_possible_map;
1375 } else { 1362 } else {
1376 mutex_lock(&callback_mutex);
1377 guarantee_online_cpus(cs, cpus_attach); 1363 guarantee_online_cpus(cs, cpus_attach);
1378 mutex_unlock(&callback_mutex); 1364 guarantee_online_mems(cs, &to);
1379 } 1365 }
1380 err = set_cpus_allowed_ptr(tsk, cpus_attach); 1366 err = set_cpus_allowed_ptr(tsk, cpus_attach);
1381 if (err) 1367 if (err)
1382 return; 1368 return;
1383 1369
1370 task_lock(tsk);
1371 cpuset_change_task_nodemask(tsk, &to);
1372 task_unlock(tsk);
1373 cpuset_update_task_spread_flag(cs, tsk);
1374
1384 from = oldcs->mems_allowed; 1375 from = oldcs->mems_allowed;
1385 to = cs->mems_allowed; 1376 to = cs->mems_allowed;
1386 mm = get_task_mm(tsk); 1377 mm = get_task_mm(tsk);
@@ -1442,11 +1433,9 @@ static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
1442 break; 1433 break;
1443 case FILE_SPREAD_PAGE: 1434 case FILE_SPREAD_PAGE:
1444 retval = update_flag(CS_SPREAD_PAGE, cs, val); 1435 retval = update_flag(CS_SPREAD_PAGE, cs, val);
1445 cs->mems_generation = cpuset_mems_generation++;
1446 break; 1436 break;
1447 case FILE_SPREAD_SLAB: 1437 case FILE_SPREAD_SLAB:
1448 retval = update_flag(CS_SPREAD_SLAB, cs, val); 1438 retval = update_flag(CS_SPREAD_SLAB, cs, val);
1449 cs->mems_generation = cpuset_mems_generation++;
1450 break; 1439 break;
1451 default: 1440 default:
1452 retval = -EINVAL; 1441 retval = -EINVAL;
@@ -1786,8 +1775,6 @@ static struct cgroup_subsys_state *cpuset_create(
1786 struct cpuset *parent; 1775 struct cpuset *parent;
1787 1776
1788 if (!cont->parent) { 1777 if (!cont->parent) {
1789 /* This is early initialization for the top cgroup */
1790 top_cpuset.mems_generation = cpuset_mems_generation++;
1791 return &top_cpuset.css; 1778 return &top_cpuset.css;
1792 } 1779 }
1793 parent = cgroup_cs(cont->parent); 1780 parent = cgroup_cs(cont->parent);
@@ -1799,7 +1786,6 @@ static struct cgroup_subsys_state *cpuset_create(
1799 return ERR_PTR(-ENOMEM); 1786 return ERR_PTR(-ENOMEM);
1800 } 1787 }
1801 1788
1802 cpuset_update_task_memory_state();
1803 cs->flags = 0; 1789 cs->flags = 0;
1804 if (is_spread_page(parent)) 1790 if (is_spread_page(parent))
1805 set_bit(CS_SPREAD_PAGE, &cs->flags); 1791 set_bit(CS_SPREAD_PAGE, &cs->flags);
@@ -1808,7 +1794,6 @@ static struct cgroup_subsys_state *cpuset_create(
1808 set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags); 1794 set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
1809 cpumask_clear(cs->cpus_allowed); 1795 cpumask_clear(cs->cpus_allowed);
1810 nodes_clear(cs->mems_allowed); 1796 nodes_clear(cs->mems_allowed);
1811 cs->mems_generation = cpuset_mems_generation++;
1812 fmeter_init(&cs->fmeter); 1797 fmeter_init(&cs->fmeter);
1813 cs->relax_domain_level = -1; 1798 cs->relax_domain_level = -1;
1814 1799
@@ -1827,8 +1812,6 @@ static void cpuset_destroy(struct cgroup_subsys *ss, struct cgroup *cont)
1827{ 1812{
1828 struct cpuset *cs = cgroup_cs(cont); 1813 struct cpuset *cs = cgroup_cs(cont);
1829 1814
1830 cpuset_update_task_memory_state();
1831
1832 if (is_sched_load_balance(cs)) 1815 if (is_sched_load_balance(cs))
1833 update_flag(CS_SCHED_LOAD_BALANCE, cs, 0); 1816 update_flag(CS_SCHED_LOAD_BALANCE, cs, 0);
1834 1817
@@ -1849,21 +1832,6 @@ struct cgroup_subsys cpuset_subsys = {
1849 .early_init = 1, 1832 .early_init = 1,
1850}; 1833};
1851 1834
1852/*
1853 * cpuset_init_early - just enough so that the calls to
1854 * cpuset_update_task_memory_state() in early init code
1855 * are harmless.
1856 */
1857
1858int __init cpuset_init_early(void)
1859{
1860 alloc_cpumask_var(&top_cpuset.cpus_allowed, GFP_NOWAIT);
1861
1862 top_cpuset.mems_generation = cpuset_mems_generation++;
1863 return 0;
1864}
1865
1866
1867/** 1835/**
1868 * cpuset_init - initialize cpusets at system boot 1836 * cpuset_init - initialize cpusets at system boot
1869 * 1837 *
@@ -1874,11 +1842,13 @@ int __init cpuset_init(void)
1874{ 1842{
1875 int err = 0; 1843 int err = 0;
1876 1844
1845 if (!alloc_cpumask_var(&top_cpuset.cpus_allowed, GFP_KERNEL))
1846 BUG();
1847
1877 cpumask_setall(top_cpuset.cpus_allowed); 1848 cpumask_setall(top_cpuset.cpus_allowed);
1878 nodes_setall(top_cpuset.mems_allowed); 1849 nodes_setall(top_cpuset.mems_allowed);
1879 1850
1880 fmeter_init(&top_cpuset.fmeter); 1851 fmeter_init(&top_cpuset.fmeter);
1881 top_cpuset.mems_generation = cpuset_mems_generation++;
1882 set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags); 1852 set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
1883 top_cpuset.relax_domain_level = -1; 1853 top_cpuset.relax_domain_level = -1;
1884 1854
diff --git a/kernel/groups.c b/kernel/groups.c
new file mode 100644
index 000000000000..2b45b2ee3964
--- /dev/null
+++ b/kernel/groups.c
@@ -0,0 +1,288 @@
1/*
2 * Supplementary group IDs
3 */
4#include <linux/cred.h>
5#include <linux/module.h>
6#include <linux/slab.h>
7#include <linux/security.h>
8#include <linux/syscalls.h>
9#include <asm/uaccess.h>
10
11/* init to 2 - one for init_task, one to ensure it is never freed */
12struct group_info init_groups = { .usage = ATOMIC_INIT(2) };
13
14struct group_info *groups_alloc(int gidsetsize)
15{
16 struct group_info *group_info;
17 int nblocks;
18 int i;
19
20 nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;
21 /* Make sure we always allocate at least one indirect block pointer */
22 nblocks = nblocks ? : 1;
23 group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);
24 if (!group_info)
25 return NULL;
26 group_info->ngroups = gidsetsize;
27 group_info->nblocks = nblocks;
28 atomic_set(&group_info->usage, 1);
29
30 if (gidsetsize <= NGROUPS_SMALL)
31 group_info->blocks[0] = group_info->small_block;
32 else {
33 for (i = 0; i < nblocks; i++) {
34 gid_t *b;
35 b = (void *)__get_free_page(GFP_USER);
36 if (!b)
37 goto out_undo_partial_alloc;
38 group_info->blocks[i] = b;
39 }
40 }
41 return group_info;
42
43out_undo_partial_alloc:
44 while (--i >= 0) {
45 free_page((unsigned long)group_info->blocks[i]);
46 }
47 kfree(group_info);
48 return NULL;
49}
50
51EXPORT_SYMBOL(groups_alloc);
52
53void groups_free(struct group_info *group_info)
54{
55 if (group_info->blocks[0] != group_info->small_block) {
56 int i;
57 for (i = 0; i < group_info->nblocks; i++)
58 free_page((unsigned long)group_info->blocks[i]);
59 }
60 kfree(group_info);
61}
62
63EXPORT_SYMBOL(groups_free);
64
65/* export the group_info to a user-space array */
66static int groups_to_user(gid_t __user *grouplist,
67 const struct group_info *group_info)
68{
69 int i;
70 unsigned int count = group_info->ngroups;
71
72 for (i = 0; i < group_info->nblocks; i++) {
73 unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
74 unsigned int len = cp_count * sizeof(*grouplist);
75
76 if (copy_to_user(grouplist, group_info->blocks[i], len))
77 return -EFAULT;
78
79 grouplist += NGROUPS_PER_BLOCK;
80 count -= cp_count;
81 }
82 return 0;
83}
84
85/* fill a group_info from a user-space array - it must be allocated already */
86static int groups_from_user(struct group_info *group_info,
87 gid_t __user *grouplist)
88{
89 int i;
90 unsigned int count = group_info->ngroups;
91
92 for (i = 0; i < group_info->nblocks; i++) {
93 unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
94 unsigned int len = cp_count * sizeof(*grouplist);
95
96 if (copy_from_user(group_info->blocks[i], grouplist, len))
97 return -EFAULT;
98
99 grouplist += NGROUPS_PER_BLOCK;
100 count -= cp_count;
101 }
102 return 0;
103}
104
105/* a simple Shell sort */
106static void groups_sort(struct group_info *group_info)
107{
108 int base, max, stride;
109 int gidsetsize = group_info->ngroups;
110
111 for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
112 ; /* nothing */
113 stride /= 3;
114
115 while (stride) {
116 max = gidsetsize - stride;
117 for (base = 0; base < max; base++) {
118 int left = base;
119 int right = left + stride;
120 gid_t tmp = GROUP_AT(group_info, right);
121
122 while (left >= 0 && GROUP_AT(group_info, left) > tmp) {
123 GROUP_AT(group_info, right) =
124 GROUP_AT(group_info, left);
125 right = left;
126 left -= stride;
127 }
128 GROUP_AT(group_info, right) = tmp;
129 }
130 stride /= 3;
131 }
132}
133
134/* a simple bsearch */
135int groups_search(const struct group_info *group_info, gid_t grp)
136{
137 unsigned int left, right;
138
139 if (!group_info)
140 return 0;
141
142 left = 0;
143 right = group_info->ngroups;
144 while (left < right) {
145 unsigned int mid = (left+right)/2;
146 int cmp = grp - GROUP_AT(group_info, mid);
147 if (cmp > 0)
148 left = mid + 1;
149 else if (cmp < 0)
150 right = mid;
151 else
152 return 1;
153 }
154 return 0;
155}
156
157/**
158 * set_groups - Change a group subscription in a set of credentials
159 * @new: The newly prepared set of credentials to alter
160 * @group_info: The group list to install
161 *
162 * Validate a group subscription and, if valid, insert it into a set
163 * of credentials.
164 */
165int set_groups(struct cred *new, struct group_info *group_info)
166{
167 int retval;
168
169 retval = security_task_setgroups(group_info);
170 if (retval)
171 return retval;
172
173 put_group_info(new->group_info);
174 groups_sort(group_info);
175 get_group_info(group_info);
176 new->group_info = group_info;
177 return 0;
178}
179
180EXPORT_SYMBOL(set_groups);
181
182/**
183 * set_current_groups - Change current's group subscription
184 * @group_info: The group list to impose
185 *
186 * Validate a group subscription and, if valid, impose it upon current's task
187 * security record.
188 */
189int set_current_groups(struct group_info *group_info)
190{
191 struct cred *new;
192 int ret;
193
194 new = prepare_creds();
195 if (!new)
196 return -ENOMEM;
197
198 ret = set_groups(new, group_info);
199 if (ret < 0) {
200 abort_creds(new);
201 return ret;
202 }
203
204 return commit_creds(new);
205}
206
207EXPORT_SYMBOL(set_current_groups);
208
209SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)
210{
211 const struct cred *cred = current_cred();
212 int i;
213
214 if (gidsetsize < 0)
215 return -EINVAL;
216
217 /* no need to grab task_lock here; it cannot change */
218 i = cred->group_info->ngroups;
219 if (gidsetsize) {
220 if (i > gidsetsize) {
221 i = -EINVAL;
222 goto out;
223 }
224 if (groups_to_user(grouplist, cred->group_info)) {
225 i = -EFAULT;
226 goto out;
227 }
228 }
229out:
230 return i;
231}
232
233/*
234 * SMP: Our groups are copy-on-write. We can set them safely
235 * without another task interfering.
236 */
237
238SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
239{
240 struct group_info *group_info;
241 int retval;
242
243 if (!capable(CAP_SETGID))
244 return -EPERM;
245 if ((unsigned)gidsetsize > NGROUPS_MAX)
246 return -EINVAL;
247
248 group_info = groups_alloc(gidsetsize);
249 if (!group_info)
250 return -ENOMEM;
251 retval = groups_from_user(group_info, grouplist);
252 if (retval) {
253 put_group_info(group_info);
254 return retval;
255 }
256
257 retval = set_current_groups(group_info);
258 put_group_info(group_info);
259
260 return retval;
261}
262
263/*
264 * Check whether we're fsgid/egid or in the supplemental group..
265 */
266int in_group_p(gid_t grp)
267{
268 const struct cred *cred = current_cred();
269 int retval = 1;
270
271 if (grp != cred->fsgid)
272 retval = groups_search(cred->group_info, grp);
273 return retval;
274}
275
276EXPORT_SYMBOL(in_group_p);
277
278int in_egroup_p(gid_t grp)
279{
280 const struct cred *cred = current_cred();
281 int retval = 1;
282
283 if (grp != cred->egid)
284 retval = groups_search(cred->group_info, grp);
285 return retval;
286}
287
288EXPORT_SYMBOL(in_egroup_p);
diff --git a/kernel/kfifo.c b/kernel/kfifo.c
index bc41ad0f24f8..26539e3228e5 100644
--- a/kernel/kfifo.c
+++ b/kernel/kfifo.c
@@ -72,9 +72,9 @@ struct kfifo *kfifo_alloc(unsigned int size, gfp_t gfp_mask, spinlock_t *lock)
72 72
73 /* 73 /*
74 * round up to the next power of 2, since our 'let the indices 74 * round up to the next power of 2, since our 'let the indices
75 * wrap' tachnique works only in this case. 75 * wrap' technique works only in this case.
76 */ 76 */
77 if (size & (size - 1)) { 77 if (!is_power_of_2(size)) {
78 BUG_ON(size > 0x80000000); 78 BUG_ON(size > 0x80000000);
79 size = roundup_pow_of_two(size); 79 size = roundup_pow_of_two(size);
80 } 80 }
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 41c88fe40500..7fa441333529 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -9,6 +9,7 @@
9#include <linux/kthread.h> 9#include <linux/kthread.h>
10#include <linux/completion.h> 10#include <linux/completion.h>
11#include <linux/err.h> 11#include <linux/err.h>
12#include <linux/cpuset.h>
12#include <linux/unistd.h> 13#include <linux/unistd.h>
13#include <linux/file.h> 14#include <linux/file.h>
14#include <linux/module.h> 15#include <linux/module.h>
@@ -236,6 +237,7 @@ int kthreadd(void *unused)
236 ignore_signals(tsk); 237 ignore_signals(tsk);
237 set_user_nice(tsk, KTHREAD_NICE_LEVEL); 238 set_user_nice(tsk, KTHREAD_NICE_LEVEL);
238 set_cpus_allowed_ptr(tsk, cpu_all_mask); 239 set_cpus_allowed_ptr(tsk, cpu_all_mask);
240 set_mems_allowed(node_possible_map);
239 241
240 current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG; 242 current->flags |= PF_NOFREEZE | PF_FREEZER_NOSIG;
241 243
diff --git a/kernel/power/process.c b/kernel/power/process.c
index ca634019497a..da2072d73811 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -117,9 +117,12 @@ int freeze_processes(void)
117 if (error) 117 if (error)
118 goto Exit; 118 goto Exit;
119 printk("done."); 119 printk("done.");
120
121 oom_killer_disable();
120 Exit: 122 Exit:
121 BUG_ON(in_atomic()); 123 BUG_ON(in_atomic());
122 printk("\n"); 124 printk("\n");
125
123 return error; 126 return error;
124} 127}
125 128
@@ -145,6 +148,8 @@ static void thaw_tasks(bool nosig_only)
145 148
146void thaw_processes(void) 149void thaw_processes(void)
147{ 150{
151 oom_killer_enable();
152
148 printk("Restarting tasks ... "); 153 printk("Restarting tasks ... ");
149 thaw_tasks(true); 154 thaw_tasks(true);
150 thaw_tasks(false); 155 thaw_tasks(false);
diff --git a/kernel/profile.c b/kernel/profile.c
index 28cf26ad2d24..69911b5745eb 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -365,7 +365,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
365 node = cpu_to_node(cpu); 365 node = cpu_to_node(cpu);
366 per_cpu(cpu_profile_flip, cpu) = 0; 366 per_cpu(cpu_profile_flip, cpu) = 0;
367 if (!per_cpu(cpu_profile_hits, cpu)[1]) { 367 if (!per_cpu(cpu_profile_hits, cpu)[1]) {
368 page = alloc_pages_node(node, 368 page = alloc_pages_exact_node(node,
369 GFP_KERNEL | __GFP_ZERO, 369 GFP_KERNEL | __GFP_ZERO,
370 0); 370 0);
371 if (!page) 371 if (!page)
@@ -373,7 +373,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
373 per_cpu(cpu_profile_hits, cpu)[1] = page_address(page); 373 per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
374 } 374 }
375 if (!per_cpu(cpu_profile_hits, cpu)[0]) { 375 if (!per_cpu(cpu_profile_hits, cpu)[0]) {
376 page = alloc_pages_node(node, 376 page = alloc_pages_exact_node(node,
377 GFP_KERNEL | __GFP_ZERO, 377 GFP_KERNEL | __GFP_ZERO,
378 0); 378 0);
379 if (!page) 379 if (!page)
@@ -564,14 +564,14 @@ static int create_hash_tables(void)
564 int node = cpu_to_node(cpu); 564 int node = cpu_to_node(cpu);
565 struct page *page; 565 struct page *page;
566 566
567 page = alloc_pages_node(node, 567 page = alloc_pages_exact_node(node,
568 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE, 568 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
569 0); 569 0);
570 if (!page) 570 if (!page)
571 goto out_cleanup; 571 goto out_cleanup;
572 per_cpu(cpu_profile_hits, cpu)[1] 572 per_cpu(cpu_profile_hits, cpu)[1]
573 = (struct profile_hit *)page_address(page); 573 = (struct profile_hit *)page_address(page);
574 page = alloc_pages_node(node, 574 page = alloc_pages_exact_node(node,
575 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE, 575 GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
576 0); 576 0);
577 if (!page) 577 if (!page)
diff --git a/kernel/slow-work.c b/kernel/slow-work.c
index 521ed2004d63..09d7519557d3 100644
--- a/kernel/slow-work.c
+++ b/kernel/slow-work.c
@@ -319,6 +319,15 @@ cant_get_ref:
319EXPORT_SYMBOL(slow_work_enqueue); 319EXPORT_SYMBOL(slow_work_enqueue);
320 320
321/* 321/*
322 * Schedule a cull of the thread pool at some time in the near future
323 */
324static void slow_work_schedule_cull(void)
325{
326 mod_timer(&slow_work_cull_timer,
327 round_jiffies(jiffies + SLOW_WORK_CULL_TIMEOUT));
328}
329
330/*
322 * Worker thread culling algorithm 331 * Worker thread culling algorithm
323 */ 332 */
324static bool slow_work_cull_thread(void) 333static bool slow_work_cull_thread(void)
@@ -335,8 +344,7 @@ static bool slow_work_cull_thread(void)
335 list_empty(&vslow_work_queue) && 344 list_empty(&vslow_work_queue) &&
336 atomic_read(&slow_work_thread_count) > 345 atomic_read(&slow_work_thread_count) >
337 slow_work_min_threads) { 346 slow_work_min_threads) {
338 mod_timer(&slow_work_cull_timer, 347 slow_work_schedule_cull();
339 jiffies + SLOW_WORK_CULL_TIMEOUT);
340 do_cull = true; 348 do_cull = true;
341 } 349 }
342 } 350 }
@@ -393,8 +401,7 @@ static int slow_work_thread(void *_data)
393 list_empty(&vslow_work_queue) && 401 list_empty(&vslow_work_queue) &&
394 atomic_read(&slow_work_thread_count) > 402 atomic_read(&slow_work_thread_count) >
395 slow_work_min_threads) 403 slow_work_min_threads)
396 mod_timer(&slow_work_cull_timer, 404 slow_work_schedule_cull();
397 jiffies + SLOW_WORK_CULL_TIMEOUT);
398 continue; 405 continue;
399 } 406 }
400 407
@@ -458,7 +465,7 @@ static void slow_work_new_thread_execute(struct slow_work *work)
458 if (atomic_dec_and_test(&slow_work_thread_count)) 465 if (atomic_dec_and_test(&slow_work_thread_count))
459 BUG(); /* we're running on a slow work thread... */ 466 BUG(); /* we're running on a slow work thread... */
460 mod_timer(&slow_work_oom_timer, 467 mod_timer(&slow_work_oom_timer,
461 jiffies + SLOW_WORK_OOM_TIMEOUT); 468 round_jiffies(jiffies + SLOW_WORK_OOM_TIMEOUT));
462 } else { 469 } else {
463 /* ratelimit the starting of new threads */ 470 /* ratelimit the starting of new threads */
464 mod_timer(&slow_work_oom_timer, jiffies + 1); 471 mod_timer(&slow_work_oom_timer, jiffies + 1);
@@ -502,8 +509,7 @@ static int slow_work_min_threads_sysctl(struct ctl_table *table, int write,
502 if (n < 0 && !slow_work_may_not_start_new_thread) 509 if (n < 0 && !slow_work_may_not_start_new_thread)
503 slow_work_enqueue(&slow_work_new_thread); 510 slow_work_enqueue(&slow_work_new_thread);
504 else if (n > 0) 511 else if (n > 0)
505 mod_timer(&slow_work_cull_timer, 512 slow_work_schedule_cull();
506 jiffies + SLOW_WORK_CULL_TIMEOUT);
507 } 513 }
508 mutex_unlock(&slow_work_user_lock); 514 mutex_unlock(&slow_work_user_lock);
509 } 515 }
@@ -529,8 +535,7 @@ static int slow_work_max_threads_sysctl(struct ctl_table *table, int write,
529 atomic_read(&slow_work_thread_count); 535 atomic_read(&slow_work_thread_count);
530 536
531 if (n < 0) 537 if (n < 0)
532 mod_timer(&slow_work_cull_timer, 538 slow_work_schedule_cull();
533 jiffies + SLOW_WORK_CULL_TIMEOUT);
534 } 539 }
535 mutex_unlock(&slow_work_user_lock); 540 mutex_unlock(&slow_work_user_lock);
536 } 541 }
diff --git a/kernel/sys.c b/kernel/sys.c
index 438d99a38c87..b3f1097c76fa 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1113,289 +1113,6 @@ out:
1113 return err; 1113 return err;
1114} 1114}
1115 1115
1116/*
1117 * Supplementary group IDs
1118 */
1119
1120/* init to 2 - one for init_task, one to ensure it is never freed */
1121struct group_info init_groups = { .usage = ATOMIC_INIT(2) };
1122
1123struct group_info *groups_alloc(int gidsetsize)
1124{
1125 struct group_info *group_info;
1126 int nblocks;
1127 int i;
1128
1129 nblocks = (gidsetsize + NGROUPS_PER_BLOCK - 1) / NGROUPS_PER_BLOCK;
1130 /* Make sure we always allocate at least one indirect block pointer */
1131 nblocks = nblocks ? : 1;
1132 group_info = kmalloc(sizeof(*group_info) + nblocks*sizeof(gid_t *), GFP_USER);
1133 if (!group_info)
1134 return NULL;
1135 group_info->ngroups = gidsetsize;
1136 group_info->nblocks = nblocks;
1137 atomic_set(&group_info->usage, 1);
1138
1139 if (gidsetsize <= NGROUPS_SMALL)
1140 group_info->blocks[0] = group_info->small_block;
1141 else {
1142 for (i = 0; i < nblocks; i++) {
1143 gid_t *b;
1144 b = (void *)__get_free_page(GFP_USER);
1145 if (!b)
1146 goto out_undo_partial_alloc;
1147 group_info->blocks[i] = b;
1148 }
1149 }
1150 return group_info;
1151
1152out_undo_partial_alloc:
1153 while (--i >= 0) {
1154 free_page((unsigned long)group_info->blocks[i]);
1155 }
1156 kfree(group_info);
1157 return NULL;
1158}
1159
1160EXPORT_SYMBOL(groups_alloc);
1161
1162void groups_free(struct group_info *group_info)
1163{
1164 if (group_info->blocks[0] != group_info->small_block) {
1165 int i;
1166 for (i = 0; i < group_info->nblocks; i++)
1167 free_page((unsigned long)group_info->blocks[i]);
1168 }
1169 kfree(group_info);
1170}
1171
1172EXPORT_SYMBOL(groups_free);
1173
1174/* export the group_info to a user-space array */
1175static int groups_to_user(gid_t __user *grouplist,
1176 const struct group_info *group_info)
1177{
1178 int i;
1179 unsigned int count = group_info->ngroups;
1180
1181 for (i = 0; i < group_info->nblocks; i++) {
1182 unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
1183 unsigned int len = cp_count * sizeof(*grouplist);
1184
1185 if (copy_to_user(grouplist, group_info->blocks[i], len))
1186 return -EFAULT;
1187
1188 grouplist += NGROUPS_PER_BLOCK;
1189 count -= cp_count;
1190 }
1191 return 0;
1192}
1193
1194/* fill a group_info from a user-space array - it must be allocated already */
1195static int groups_from_user(struct group_info *group_info,
1196 gid_t __user *grouplist)
1197{
1198 int i;
1199 unsigned int count = group_info->ngroups;
1200
1201 for (i = 0; i < group_info->nblocks; i++) {
1202 unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
1203 unsigned int len = cp_count * sizeof(*grouplist);
1204
1205 if (copy_from_user(group_info->blocks[i], grouplist, len))
1206 return -EFAULT;
1207
1208 grouplist += NGROUPS_PER_BLOCK;
1209 count -= cp_count;
1210 }
1211 return 0;
1212}
1213
1214/* a simple Shell sort */
1215static void groups_sort(struct group_info *group_info)
1216{
1217 int base, max, stride;
1218 int gidsetsize = group_info->ngroups;
1219
1220 for (stride = 1; stride < gidsetsize; stride = 3 * stride + 1)
1221 ; /* nothing */
1222 stride /= 3;
1223
1224 while (stride) {
1225 max = gidsetsize - stride;
1226 for (base = 0; base < max; base++) {
1227 int left = base;
1228 int right = left + stride;
1229 gid_t tmp = GROUP_AT(group_info, right);
1230
1231 while (left >= 0 && GROUP_AT(group_info, left) > tmp) {
1232 GROUP_AT(group_info, right) =
1233 GROUP_AT(group_info, left);
1234 right = left;
1235 left -= stride;
1236 }
1237 GROUP_AT(group_info, right) = tmp;
1238 }
1239 stride /= 3;
1240 }
1241}
1242
1243/* a simple bsearch */
1244int groups_search(const struct group_info *group_info, gid_t grp)
1245{
1246 unsigned int left, right;
1247
1248 if (!group_info)
1249 return 0;
1250
1251 left = 0;
1252 right = group_info->ngroups;
1253 while (left < right) {
1254 unsigned int mid = (left+right)/2;
1255 int cmp = grp - GROUP_AT(group_info, mid);
1256 if (cmp > 0)
1257 left = mid + 1;
1258 else if (cmp < 0)
1259 right = mid;
1260 else
1261 return 1;
1262 }
1263 return 0;
1264}
1265
1266/**
1267 * set_groups - Change a group subscription in a set of credentials
1268 * @new: The newly prepared set of credentials to alter
1269 * @group_info: The group list to install
1270 *
1271 * Validate a group subscription and, if valid, insert it into a set
1272 * of credentials.
1273 */
1274int set_groups(struct cred *new, struct group_info *group_info)
1275{
1276 int retval;
1277
1278 retval = security_task_setgroups(group_info);
1279 if (retval)
1280 return retval;
1281
1282 put_group_info(new->group_info);
1283 groups_sort(group_info);
1284 get_group_info(group_info);
1285 new->group_info = group_info;
1286 return 0;
1287}
1288
1289EXPORT_SYMBOL(set_groups);
1290
1291/**
1292 * set_current_groups - Change current's group subscription
1293 * @group_info: The group list to impose
1294 *
1295 * Validate a group subscription and, if valid, impose it upon current's task
1296 * security record.
1297 */
1298int set_current_groups(struct group_info *group_info)
1299{
1300 struct cred *new;
1301 int ret;
1302
1303 new = prepare_creds();
1304 if (!new)
1305 return -ENOMEM;
1306
1307 ret = set_groups(new, group_info);
1308 if (ret < 0) {
1309 abort_creds(new);
1310 return ret;
1311 }
1312
1313 return commit_creds(new);
1314}
1315
1316EXPORT_SYMBOL(set_current_groups);
1317
1318SYSCALL_DEFINE2(getgroups, int, gidsetsize, gid_t __user *, grouplist)
1319{
1320 const struct cred *cred = current_cred();
1321 int i;
1322
1323 if (gidsetsize < 0)
1324 return -EINVAL;
1325
1326 /* no need to grab task_lock here; it cannot change */
1327 i = cred->group_info->ngroups;
1328 if (gidsetsize) {
1329 if (i > gidsetsize) {
1330 i = -EINVAL;
1331 goto out;
1332 }
1333 if (groups_to_user(grouplist, cred->group_info)) {
1334 i = -EFAULT;
1335 goto out;
1336 }
1337 }
1338out:
1339 return i;
1340}
1341
1342/*
1343 * SMP: Our groups are copy-on-write. We can set them safely
1344 * without another task interfering.
1345 */
1346
1347SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
1348{
1349 struct group_info *group_info;
1350 int retval;
1351
1352 if (!capable(CAP_SETGID))
1353 return -EPERM;
1354 if ((unsigned)gidsetsize > NGROUPS_MAX)
1355 return -EINVAL;
1356
1357 group_info = groups_alloc(gidsetsize);
1358 if (!group_info)
1359 return -ENOMEM;
1360 retval = groups_from_user(group_info, grouplist);
1361 if (retval) {
1362 put_group_info(group_info);
1363 return retval;
1364 }
1365
1366 retval = set_current_groups(group_info);
1367 put_group_info(group_info);
1368
1369 return retval;
1370}
1371
1372/*
1373 * Check whether we're fsgid/egid or in the supplemental group..
1374 */
1375int in_group_p(gid_t grp)
1376{
1377 const struct cred *cred = current_cred();
1378 int retval = 1;
1379
1380 if (grp != cred->fsgid)
1381 retval = groups_search(cred->group_info, grp);
1382 return retval;
1383}
1384
1385EXPORT_SYMBOL(in_group_p);
1386
1387int in_egroup_p(gid_t grp)
1388{
1389 const struct cred *cred = current_cred();
1390 int retval = 1;
1391
1392 if (grp != cred->egid)
1393 retval = groups_search(cred->group_info, grp);
1394 return retval;
1395}
1396
1397EXPORT_SYMBOL(in_egroup_p);
1398
1399DECLARE_RWSEM(uts_sem); 1116DECLARE_RWSEM(uts_sem);
1400 1117
1401SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) 1118SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f5c76b6cd616..ab462b9968d5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1337,7 +1337,6 @@ static struct ctl_table vm_table[] = {
1337 .extra2 = &one, 1337 .extra2 = &one,
1338 }, 1338 },
1339#endif 1339#endif
1340#ifdef CONFIG_UNEVICTABLE_LRU
1341 { 1340 {
1342 .ctl_name = CTL_UNNUMBERED, 1341 .ctl_name = CTL_UNNUMBERED,
1343 .procname = "scan_unevictable_pages", 1342 .procname = "scan_unevictable_pages",
@@ -1346,7 +1345,6 @@ static struct ctl_table vm_table[] = {
1346 .mode = 0644, 1345 .mode = 0644,
1347 .proc_handler = &scan_unevictable_handler, 1346 .proc_handler = &scan_unevictable_handler,
1348 }, 1347 },
1349#endif
1350/* 1348/*
1351 * NOTE: do not add new entries to this table unless you have read 1349 * NOTE: do not add new entries to this table unless you have read
1352 * Documentation/sysctl/ctl_unnumbered.txt 1350 * Documentation/sysctl/ctl_unnumbered.txt
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-31 16:16:44 -0500