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Merge branch 'akpm' (updates from Andrew Morton) 

Merge misc fixes from Andrew Morton:
 "Bunch of fixes and one little addition to math64.h"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (27 commits)
  include/linux/math64.h: add div64_ul()
  mm: memcontrol: fix lockless reclaim hierarchy iterator
  frontswap: fix incorrect zeroing and allocation size for frontswap_map
  kernel/audit_tree.c:audit_add_tree_rule(): protect `rule' from kill_rules()
  mm: migration: add migrate_entry_wait_huge()
  ocfs2: add missing lockres put in dlm_mig_lockres_handler
  mm/page_alloc.c: fix watermark check in __zone_watermark_ok()
  drivers/misc/sgi-gru/grufile.c: fix info leak in gru_get_config_info()
  aio: fix io_destroy() regression by using call_rcu()
  rtc-at91rm9200: use shadow IMR on at91sam9x5
  rtc-at91rm9200: add shadow interrupt mask
  rtc-at91rm9200: refactor interrupt-register handling
  rtc-at91rm9200: add configuration support
  rtc-at91rm9200: add match-table compile guard
  fs/ocfs2/namei.c: remove unecessary ERROR when removing non-empty directory
  swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion
  drivers/rtc/rtc-twl.c: fix missing device_init_wakeup() when booted with device tree
  cciss: fix broken mutex usage in ioctl
  audit: wait_for_auditd() should use TASK_UNINTERRUPTIBLE
  drivers/rtc/rtc-cmos.c: fix accidentally enabling rtc channel
  ...
This commit is contained in:
Linus Torvalds 2013-06-12 16:29:53 -07:00
parent 1a9c3d68d6 c2853c8df5
commit a568fa1c91
28 changed files with 321 additions and 168 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/devicetree/bindings/rtc/atmel,at91rm9200-rtc.txt
View File

@ -1,7 +1,7 @@
Atmel AT91RM9200 Real Time Clock
Required properties:
- compatible: should be: "atmel,at91rm9200-rtc"
- compatible: should be: "atmel,at91rm9200-rtc" or "atmel,at91sam9x5-rtc"
- reg: physical base address of the controller and length of memory mapped
region.
- interrupts: rtc alarm/event interrupt

32
drivers/block/cciss.c
View File

@ -168,8 +168,6 @@ static irqreturn_t do_cciss_msix_intr(int irq, void *dev_id);
static int cciss_open(struct block_device *bdev, fmode_t mode);
static int cciss_unlocked_open(struct block_device *bdev, fmode_t mode);
static void cciss_release(struct gendisk *disk, fmode_t mode);
static int do_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg);
static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg);
static int cciss_getgeo(struct block_device *bdev, struct hd_geometry *geo);
@ -235,7 +233,7 @@ static const struct block_device_operations cciss_fops = {
.owner = THIS_MODULE,
.open = cciss_unlocked_open,
.release = cciss_release,
.ioctl = do_ioctl,
.ioctl = cciss_ioctl,
.getgeo = cciss_getgeo,
#ifdef CONFIG_COMPAT
.compat_ioctl = cciss_compat_ioctl,
@ -1143,16 +1141,6 @@ static void cciss_release(struct gendisk *disk, fmode_t mode)
mutex_unlock(&cciss_mutex);
}
static int do_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd, unsigned long arg)
{
int ret;
mutex_lock(&cciss_mutex);
ret = cciss_ioctl(bdev, mode, cmd, arg);
mutex_unlock(&cciss_mutex);
return ret;
}
#ifdef CONFIG_COMPAT
static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
@ -1179,7 +1167,7 @@ static int cciss_compat_ioctl(struct block_device *bdev, fmode_t mode,
case CCISS_REGNEWD:
case CCISS_RESCANDISK:
case CCISS_GETLUNINFO:
return do_ioctl(bdev, mode, cmd, arg);
return cciss_ioctl(bdev, mode, cmd, arg);
case CCISS_PASSTHRU32:
return cciss_ioctl32_passthru(bdev, mode, cmd, arg);
@ -1219,7 +1207,7 @@ static int cciss_ioctl32_passthru(struct block_device *bdev, fmode_t mode,
if (err)
return -EFAULT;
err = do_ioctl(bdev, mode, CCISS_PASSTHRU, (unsigned long)p);
err = cciss_ioctl(bdev, mode, CCISS_PASSTHRU, (unsigned long)p);
if (err)
return err;
err |=
@ -1261,7 +1249,7 @@ static int cciss_ioctl32_big_passthru(struct block_device *bdev, fmode_t mode,
if (err)
return -EFAULT;
err = do_ioctl(bdev, mode, CCISS_BIG_PASSTHRU, (unsigned long)p);
err = cciss_ioctl(bdev, mode, CCISS_BIG_PASSTHRU, (unsigned long)p);
if (err)
return err;
err |=
@ -1311,11 +1299,14 @@ static int cciss_getpciinfo(ctlr_info_t *h, void __user *argp)
static int cciss_getintinfo(ctlr_info_t *h, void __user *argp)
{
cciss_coalint_struct intinfo;
unsigned long flags;
if (!argp)
return -EINVAL;
spin_lock_irqsave(&h->lock, flags);
intinfo.delay = readl(&h->cfgtable->HostWrite.CoalIntDelay);
intinfo.count = readl(&h->cfgtable->HostWrite.CoalIntCount);
spin_unlock_irqrestore(&h->lock, flags);
if (copy_to_user
(argp, &intinfo, sizeof(cciss_coalint_struct)))
return -EFAULT;
@ -1356,12 +1347,15 @@ static int cciss_setintinfo(ctlr_info_t *h, void __user *argp)
static int cciss_getnodename(ctlr_info_t *h, void __user *argp)
{
NodeName_type NodeName;
unsigned long flags;
int i;
if (!argp)
return -EINVAL;
spin_lock_irqsave(&h->lock, flags);
for (i = 0; i < 16; i++)
NodeName[i] = readb(&h->cfgtable->ServerName[i]);
spin_unlock_irqrestore(&h->lock, flags);
if (copy_to_user(argp, NodeName, sizeof(NodeName_type)))
return -EFAULT;
return 0;
@ -1398,10 +1392,13 @@ static int cciss_setnodename(ctlr_info_t *h, void __user *argp)
static int cciss_getheartbeat(ctlr_info_t *h, void __user *argp)
{
Heartbeat_type heartbeat;
unsigned long flags;
if (!argp)
return -EINVAL;
spin_lock_irqsave(&h->lock, flags);
heartbeat = readl(&h->cfgtable->HeartBeat);
spin_unlock_irqrestore(&h->lock, flags);
if (copy_to_user(argp, &heartbeat, sizeof(Heartbeat_type)))
return -EFAULT;
return 0;
@ -1410,10 +1407,13 @@ static int cciss_getheartbeat(ctlr_info_t *h, void __user *argp)
static int cciss_getbustypes(ctlr_info_t *h, void __user *argp)
{
BusTypes_type BusTypes;
unsigned long flags;
if (!argp)
return -EINVAL;
spin_lock_irqsave(&h->lock, flags);
BusTypes = readl(&h->cfgtable->BusTypes);
spin_unlock_irqrestore(&h->lock, flags);
if (copy_to_user(argp, &BusTypes, sizeof(BusTypes_type)))
return -EFAULT;
return 0;

1
drivers/misc/sgi-gru/grufile.c
View File

@ -172,6 +172,7 @@ static long gru_get_config_info(unsigned long arg)
nodesperblade = 2;
else
nodesperblade = 1;
memset(&info, 0, sizeof(info));
info.cpus = num_online_cpus();
info.nodes = num_online_nodes();
info.blades = info.nodes / nodesperblade;

131
drivers/rtc/rtc-at91rm9200.c
View File

@ -25,6 +25,7 @@
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/ioctl.h>
#include <linux/completion.h>
#include <linux/io.h>
@ -42,10 +43,65 @@
#define AT91_RTC_EPOCH 1900UL /* just like arch/arm/common/rtctime.c */
struct at91_rtc_config {
bool use_shadow_imr;
};
static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
static DEFINE_SPINLOCK(at91_rtc_lock);
static u32 at91_rtc_shadow_imr;
static void at91_rtc_write_ier(u32 mask)
{
unsigned long flags;
spin_lock_irqsave(&at91_rtc_lock, flags);
at91_rtc_shadow_imr |= mask;
at91_rtc_write(AT91_RTC_IER, mask);
spin_unlock_irqrestore(&at91_rtc_lock, flags);
}
static void at91_rtc_write_idr(u32 mask)
{
unsigned long flags;
spin_lock_irqsave(&at91_rtc_lock, flags);
at91_rtc_write(AT91_RTC_IDR, mask);
/*
* Register read back (of any RTC-register) needed to make sure
* IDR-register write has reached the peripheral before updating
* shadow mask.
*
* Note that there is still a possibility that the mask is updated
* before interrupts have actually been disabled in hardware. The only
* way to be certain would be to poll the IMR-register, which is is
* the very register we are trying to emulate. The register read back
* is a reasonable heuristic.
*/
at91_rtc_read(AT91_RTC_SR);
at91_rtc_shadow_imr &= ~mask;
spin_unlock_irqrestore(&at91_rtc_lock, flags);
}
static u32 at91_rtc_read_imr(void)
{
unsigned long flags;
u32 mask;
if (at91_rtc_config->use_shadow_imr) {
spin_lock_irqsave(&at91_rtc_lock, flags);
mask = at91_rtc_shadow_imr;
spin_unlock_irqrestore(&at91_rtc_lock, flags);
} else {
mask = at91_rtc_read(AT91_RTC_IMR);
}
return mask;
}
/*
* Decode time/date into rtc_time structure
@ -110,9 +166,9 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
cr = at91_rtc_read(AT91_RTC_CR);
at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ACKUPD);
at91_rtc_write_ier(AT91_RTC_ACKUPD);
wait_for_completion(&at91_rtc_updated); /* wait for ACKUPD interrupt */
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD);
at91_rtc_write_idr(AT91_RTC_ACKUPD);
at91_rtc_write(AT91_RTC_TIMR,
bin2bcd(tm->tm_sec) << 0
@ -144,7 +200,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
tm->tm_year = at91_alarm_year - 1900;
alrm->enabled = (at91_rtc_read(AT91_RTC_IMR) & AT91_RTC_ALARM)
alrm->enabled = (at91_rtc_read_imr() & AT91_RTC_ALARM)
? 1 : 0;
dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
@ -169,7 +225,7 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
tm.tm_min = alrm->time.tm_min;
tm.tm_sec = alrm->time.tm_sec;
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
at91_rtc_write_idr(AT91_RTC_ALARM);
at91_rtc_write(AT91_RTC_TIMALR,
bin2bcd(tm.tm_sec) << 0
| bin2bcd(tm.tm_min) << 8
@ -182,7 +238,7 @@ static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
if (alrm->enabled) {
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
at91_rtc_write_ier(AT91_RTC_ALARM);
}
dev_dbg(dev, "%s(): %4d-%02d-%02d %02d:%02d:%02d\n", __func__,
@ -198,9 +254,9 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
if (enabled) {
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_ALARM);
at91_rtc_write(AT91_RTC_IER, AT91_RTC_ALARM);
at91_rtc_write_ier(AT91_RTC_ALARM);
} else
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ALARM);
at91_rtc_write_idr(AT91_RTC_ALARM);
return 0;
}
@ -209,7 +265,7 @@ static int at91_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
*/
static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
{
unsigned long imr = at91_rtc_read(AT91_RTC_IMR);
unsigned long imr = at91_rtc_read_imr();
seq_printf(seq, "update_IRQ\t: %s\n",
(imr & AT91_RTC_ACKUPD) ? "yes" : "no");
@ -229,7 +285,7 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
unsigned int rtsr;
unsigned long events = 0;
rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read(AT91_RTC_IMR);
rtsr = at91_rtc_read(AT91_RTC_SR) & at91_rtc_read_imr();
if (rtsr) { /* this interrupt is shared! Is it ours? */
if (rtsr & AT91_RTC_ALARM)
events |= (RTC_AF | RTC_IRQF);
@ -250,6 +306,43 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
return IRQ_NONE; /* not handled */
}
static const struct at91_rtc_config at91rm9200_config = {
};
static const struct at91_rtc_config at91sam9x5_config = {
.use_shadow_imr = true,
};
#ifdef CONFIG_OF
static const struct of_device_id at91_rtc_dt_ids[] = {
{
.compatible = "atmel,at91rm9200-rtc",
.data = &at91rm9200_config,
}, {
.compatible = "atmel,at91sam9x5-rtc",
.data = &at91sam9x5_config,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
#endif
static const struct at91_rtc_config *
at91_rtc_get_config(struct platform_device *pdev)
{
const struct of_device_id *match;
if (pdev->dev.of_node) {
match = of_match_node(at91_rtc_dt_ids, pdev->dev.of_node);
if (!match)
return NULL;
return (const struct at91_rtc_config *)match->data;
}
return &at91rm9200_config;
}
static const struct rtc_class_ops at91_rtc_ops = {
.read_time = at91_rtc_readtime,
.set_time = at91_rtc_settime,
@ -268,6 +361,10 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
struct resource *regs;
int ret = 0;
at91_rtc_config = at91_rtc_get_config(pdev);
if (!at91_rtc_config)
return -ENODEV;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_err(&pdev->dev, "no mmio resource defined\n");
@ -290,7 +387,7 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
at91_rtc_write(AT91_RTC_MR, 0); /* 24 hour mode */
/* Disable all interrupts */
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
AT91_RTC_SECEV | AT91_RTC_TIMEV |
AT91_RTC_CALEV);
@ -335,7 +432,7 @@ static int __exit at91_rtc_remove(struct platform_device *pdev)
struct rtc_device *rtc = platform_get_drvdata(pdev);
/* Disable all interrupts */
at91_rtc_write(AT91_RTC_IDR, AT91_RTC_ACKUPD | AT91_RTC_ALARM |
at91_rtc_write_idr(AT91_RTC_ACKUPD | AT91_RTC_ALARM |
AT91_RTC_SECEV | AT91_RTC_TIMEV |
AT91_RTC_CALEV);
free_irq(irq, pdev);
@ -358,13 +455,13 @@ static int at91_rtc_suspend(struct device *dev)
/* this IRQ is shared with DBGU and other hardware which isn't
* necessarily doing PM like we are...
*/
at91_rtc_imr = at91_rtc_read(AT91_RTC_IMR)
at91_rtc_imr = at91_rtc_read_imr()
& (AT91_RTC_ALARM|AT91_RTC_SECEV);
if (at91_rtc_imr) {
if (device_may_wakeup(dev))
enable_irq_wake(irq);
else
at91_rtc_write(AT91_RTC_IDR, at91_rtc_imr);
at91_rtc_write_idr(at91_rtc_imr);
}
return 0;
}
@ -375,7 +472,7 @@ static int at91_rtc_resume(struct device *dev)
if (device_may_wakeup(dev))
disable_irq_wake(irq);
else
at91_rtc_write(AT91_RTC_IER, at91_rtc_imr);
at91_rtc_write_ier(at91_rtc_imr);
}
return 0;
}
@ -383,12 +480,6 @@ static int at91_rtc_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(at91_rtc_pm_ops, at91_rtc_suspend, at91_rtc_resume);
static const struct of_device_id at91_rtc_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-rtc" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_rtc_dt_ids);
static struct platform_driver at91_rtc_driver = {
.remove = __exit_p(at91_rtc_remove),
.driver = {

4
drivers/rtc/rtc-cmos.c
View File

@ -854,6 +854,9 @@ static int cmos_resume(struct device *dev)
}
spin_lock_irq(&rtc_lock);
if (device_may_wakeup(dev))
hpet_rtc_timer_init();
do {
CMOS_WRITE(tmp, RTC_CONTROL);
hpet_set_rtc_irq_bit(tmp & RTC_IRQMASK);
@ -869,7 +872,6 @@ static int cmos_resume(struct device *dev)
rtc_update_irq(cmos->rtc, 1, mask);
tmp &= ~RTC_AIE;
hpet_mask_rtc_irq_bit(RTC_AIE);
hpet_rtc_timer_init();
} while (mask & RTC_AIE);
spin_unlock_irq(&rtc_lock);
}

3
drivers/rtc/rtc-tps6586x.c
View File

@ -273,6 +273,8 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
return ret;
}
device_init_wakeup(&pdev->dev, 1);
platform_set_drvdata(pdev, rtc);
rtc->rtc = devm_rtc_device_register(&pdev->dev, dev_name(&pdev->dev),
&tps6586x_rtc_ops, THIS_MODULE);
@ -292,7 +294,6 @@ static int tps6586x_rtc_probe(struct platform_device *pdev)
goto fail_rtc_register;
}
disable_irq(rtc->irq);
device_set_wakeup_capable(&pdev->dev, 1);
return 0;
fail_rtc_register:

1
drivers/rtc/rtc-twl.c
View File

@ -524,6 +524,7 @@ static int twl_rtc_probe(struct platform_device *pdev)
}
platform_set_drvdata(pdev, rtc);
device_init_wakeup(&pdev->dev, 1);
return 0;
out2:

36
fs/aio.c
View File

@ -141,9 +141,6 @@ static void aio_free_ring(struct kioctx *ctx)
for (i = 0; i < ctx->nr_pages; i++)
put_page(ctx->ring_pages[i]);
if (ctx->mmap_size)
vm_munmap(ctx->mmap_base, ctx->mmap_size);
if (ctx->ring_pages && ctx->ring_pages != ctx->internal_pages)
kfree(ctx->ring_pages);
}
@ -322,11 +319,6 @@ static void free_ioctx(struct kioctx *ctx)
aio_free_ring(ctx);
spin_lock(&aio_nr_lock);
BUG_ON(aio_nr - ctx->max_reqs > aio_nr);
aio_nr -= ctx->max_reqs;
spin_unlock(&aio_nr_lock);
pr_debug("freeing %p\n", ctx);
/*
@ -435,17 +427,24 @@ static void kill_ioctx(struct kioctx *ctx)
{
if (!atomic_xchg(&ctx->dead, 1)) {
hlist_del_rcu(&ctx->list);
/* Between hlist_del_rcu() and dropping the initial ref */
synchronize_rcu();
/*
* We can't punt to workqueue here because put_ioctx() ->
* free_ioctx() will unmap the ringbuffer, and that has to be
* done in the original process's context. kill_ioctx_rcu/work()
* exist for exit_aio(), as in that path free_ioctx() won't do
* the unmap.
* It'd be more correct to do this in free_ioctx(), after all
* the outstanding kiocbs have finished - but by then io_destroy
* has already returned, so io_setup() could potentially return
* -EAGAIN with no ioctxs actually in use (as far as userspace
* could tell).
*/
kill_ioctx_work(&ctx->rcu_work);
spin_lock(&aio_nr_lock);
BUG_ON(aio_nr - ctx->max_reqs > aio_nr);
aio_nr -= ctx->max_reqs;
spin_unlock(&aio_nr_lock);
if (ctx->mmap_size)
vm_munmap(ctx->mmap_base, ctx->mmap_size);
/* Between hlist_del_rcu() and dropping the initial ref */
call_rcu(&ctx->rcu_head, kill_ioctx_rcu);
}
}
@ -495,10 +494,7 @@ void exit_aio(struct mm_struct *mm)
*/
ctx->mmap_size = 0;
if (!atomic_xchg(&ctx->dead, 1)) {
hlist_del_rcu(&ctx->list);
call_rcu(&ctx->rcu_head, kill_ioctx_rcu);
}
kill_ioctx(ctx);
}
}

1
fs/ocfs2/dlm/dlmrecovery.c
View File

@ -1408,6 +1408,7 @@ int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
mres->lockname_len, mres->lockname);
ret = -EFAULT;
spin_unlock(&res->spinlock);
dlm_lockres_put(res);
goto leave;
}
res->state |= DLM_LOCK_RES_MIGRATING;

4
fs/ocfs2/namei.c
View File

@ -947,7 +947,7 @@ leave:
ocfs2_free_dir_lookup_result(&orphan_insert);
ocfs2_free_dir_lookup_result(&lookup);
if (status)
if (status && (status != -ENOTEMPTY))
mlog_errno(status);
return status;
@ -2216,7 +2216,7 @@ out:
brelse(orphan_dir_bh);
return 0;
return ret;
}
int ocfs2_create_inode_in_orphan(struct inode *dir,

10
fs/proc/kmsg.c
View File

@ -21,12 +21,12 @@ extern wait_queue_head_t log_wait;
static int kmsg_open(struct inode * inode, struct file * file)
{
return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_FILE);
return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_PROC);
}
static int kmsg_release(struct inode * inode, struct file * file)
{
(void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_FILE);
(void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_PROC);
return 0;
}
@ -34,15 +34,15 @@ static ssize_t kmsg_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
if ((file->f_flags & O_NONBLOCK) &&
!do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_FILE))
!do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
return -EAGAIN;
return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_FILE);
return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_PROC);
}
static unsigned int kmsg_poll(struct file *file, poll_table *wait)
{
poll_wait(file, &log_wait, wait);
if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_FILE))
if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_PROC))
return POLLIN | POLLRDNORM;
return 0;
}

4
include/linux/cpu.h
View File

@ -175,6 +175,8 @@ extern struct bus_type cpu_subsys;
extern void get_online_cpus(void);
extern void put_online_cpus(void);
extern void cpu_hotplug_disable(void);
extern void cpu_hotplug_enable(void);
#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
@ -198,6 +200,8 @@ static inline void cpu_hotplug_driver_unlock(void)
#define get_online_cpus() do { } while (0)
#define put_online_cpus() do { } while (0)
#define cpu_hotplug_disable() do { } while (0)
#define cpu_hotplug_enable() do { } while (0)
#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
/* These aren't inline functions due to a GCC bug. */
#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })

6
include/linux/math64.h
View File

@ -6,7 +6,8 @@
#if BITS_PER_LONG == 64
#define div64_long(x,y) div64_s64((x),(y))
#define div64_long(x, y) div64_s64((x), (y))
#define div64_ul(x, y) div64_u64((x), (y))
/**
* div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
@ -47,7 +48,8 @@ static inline s64 div64_s64(s64 dividend, s64 divisor)
#elif BITS_PER_LONG == 32
#define div64_long(x,y) div_s64((x),(y))
#define div64_long(x, y) div_s64((x), (y))
#define div64_ul(x, y) div_u64((x), (y))
#ifndef div_u64_rem
static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)

3
include/linux/swapops.h
View File

@ -137,6 +137,7 @@ static inline void make_migration_entry_read(swp_entry_t *entry)
extern void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address);
extern void migration_entry_wait_huge(struct mm_struct *mm, pte_t *pte);
#else
#define make_migration_entry(page, write) swp_entry(0, 0)
@ -148,6 +149,8 @@ static inline int is_migration_entry(swp_entry_t swp)
static inline void make_migration_entry_read(swp_entry_t *entryp) { }
static inline void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address) { }
static inline void migration_entry_wait_huge(struct mm_struct *mm,
pte_t *pte) { }
static inline int is_write_migration_entry(swp_entry_t entry)
{
return 0;

4
include/linux/syslog.h
View File

@ -44,8 +44,8 @@
/* Return size of the log buffer */
#define SYSLOG_ACTION_SIZE_BUFFER 10
#define SYSLOG_FROM_CALL 0
#define SYSLOG_FROM_FILE 1
#define SYSLOG_FROM_READER 0
#define SYSLOG_FROM_PROC 1
int do_syslog(int type, char __user *buf, int count, bool from_file);

2
kernel/audit.c
View File

@ -1056,7 +1056,7 @@ static inline void audit_get_stamp(struct audit_context *ctx,
static void wait_for_auditd(unsigned long sleep_time)
{
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE);
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&audit_backlog_wait, &wait);
if (audit_backlog_limit &&

1
kernel/audit_tree.c
View File

@ -658,6 +658,7 @@ int audit_add_tree_rule(struct audit_krule *rule)
struct vfsmount *mnt;
int err;
rule->tree = NULL;
list_for_each_entry(tree, &tree_list, list) {
if (!strcmp(seed->pathname, tree->pathname)) {
put_tree(seed);

55
kernel/cpu.c
View File

@ -133,6 +133,27 @@ static void cpu_hotplug_done(void)
mutex_unlock(&cpu_hotplug.lock);
}
/*
* Wait for currently running CPU hotplug operations to complete (if any) and
* disable future CPU hotplug (from sysfs). The 'cpu_add_remove_lock' protects
* the 'cpu_hotplug_disabled' flag. The same lock is also acquired by the
* hotplug path before performing hotplug operations. So acquiring that lock
* guarantees mutual exclusion from any currently running hotplug operations.
*/
void cpu_hotplug_disable(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 1;
cpu_maps_update_done();
}
void cpu_hotplug_enable(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 0;
cpu_maps_update_done();
}
#else /* #if CONFIG_HOTPLUG_CPU */
static void cpu_hotplug_begin(void) {}
static void cpu_hotplug_done(void) {}
@ -540,36 +561,6 @@ static int __init alloc_frozen_cpus(void)
}
core_initcall(alloc_frozen_cpus);
/*
* Prevent regular CPU hotplug from racing with the freezer, by disabling CPU
* hotplug when tasks are about to be frozen. Also, don't allow the freezer
* to continue until any currently running CPU hotplug operation gets
* completed.
* To modify the 'cpu_hotplug_disabled' flag, we need to acquire the
* 'cpu_add_remove_lock'. And this same lock is also taken by the regular
* CPU hotplug path and released only after it is complete. Thus, we
* (and hence the freezer) will block here until any currently running CPU
* hotplug operation gets completed.
*/
void cpu_hotplug_disable_before_freeze(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 1;
cpu_maps_update_done();
}
/*
* When tasks have been thawed, re-enable regular CPU hotplug (which had been
* disabled while beginning to freeze tasks).
*/
void cpu_hotplug_enable_after_thaw(void)
{
cpu_maps_update_begin();
cpu_hotplug_disabled = 0;
cpu_maps_update_done();
}
/*
* When callbacks for CPU hotplug notifications are being executed, we must
* ensure that the state of the system with respect to the tasks being frozen
@ -589,12 +580,12 @@ cpu_hotplug_pm_callback(struct notifier_block *nb,
case PM_SUSPEND_PREPARE:
case PM_HIBERNATION_PREPARE:
cpu_hotplug_disable_before_freeze();
cpu_hotplug_disable();
break;
case PM_POST_SUSPEND:
case PM_POST_HIBERNATION:
cpu_hotplug_enable_after_thaw();
cpu_hotplug_enable();
break;
default:

91
kernel/printk.c
View File

@ -363,6 +363,53 @@ static void log_store(int facility, int level,
log_next_seq++;
}
#ifdef CONFIG_SECURITY_DMESG_RESTRICT
int dmesg_restrict = 1;
#else
int dmesg_restrict;
#endif
static int syslog_action_restricted(int type)
{
if (dmesg_restrict)
return 1;
/*
* Unless restricted, we allow "read all" and "get buffer size"
* for everybody.
*/
return type != SYSLOG_ACTION_READ_ALL &&
type != SYSLOG_ACTION_SIZE_BUFFER;
}
static int check_syslog_permissions(int type, bool from_file)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
* already done the capabilities checks at open time.
*/
if (from_file && type != SYSLOG_ACTION_OPEN)
return 0;
if (syslog_action_restricted(type)) {
if (capable(CAP_SYSLOG))
return 0;
/*
* For historical reasons, accept CAP_SYS_ADMIN too, with
* a warning.
*/
if (capable(CAP_SYS_ADMIN)) {
pr_warn_once("%s (%d): Attempt to access syslog with "
"CAP_SYS_ADMIN but no CAP_SYSLOG "
"(deprecated).\n",
current->comm, task_pid_nr(current));
return 0;
}
return -EPERM;
}
return security_syslog(type);
}
/* /dev/kmsg - userspace message inject/listen interface */
struct devkmsg_user {
u64 seq;
@ -620,7 +667,8 @@ static int devkmsg_open(struct inode *inode, struct file *file)
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
return 0;
err = security_syslog(SYSLOG_ACTION_READ_ALL);
err = check_syslog_permissions(SYSLOG_ACTION_READ_ALL,
SYSLOG_FROM_READER);
if (err)
return err;
@ -813,45 +861,6 @@ static inline void boot_delay_msec(int level)
}
#endif
#ifdef CONFIG_SECURITY_DMESG_RESTRICT
int dmesg_restrict = 1;
#else
int dmesg_restrict;
#endif
static int syslog_action_restricted(int type)
{
if (dmesg_restrict)
return 1;
/* Unless restricted, we allow "read all" and "get buffer size" for everybody */
return type != SYSLOG_ACTION_READ_ALL && type != SYSLOG_ACTION_SIZE_BUFFER;
}
static int check_syslog_permissions(int type, bool from_file)
{
/*
* If this is from /proc/kmsg and we've already opened it, then we've
* already done the capabilities checks at open time.
*/
if (from_file && type != SYSLOG_ACTION_OPEN)
return 0;
if (syslog_action_restricted(type)) {
if (capable(CAP_SYSLOG))
return 0;
/* For historical reasons, accept CAP_SYS_ADMIN too, with a warning */
if (capable(CAP_SYS_ADMIN)) {
printk_once(KERN_WARNING "%s (%d): "
"Attempt to access syslog with CAP_SYS_ADMIN "
"but no CAP_SYSLOG (deprecated).\n",
current->comm, task_pid_nr(current));
return 0;
}
return -EPERM;
}
return 0;
}
#if defined(CONFIG_PRINTK_TIME)
static bool printk_time = 1;
#else
@ -1249,7 +1258,7 @@ out:
SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
{
return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
return do_syslog(type, buf, len, SYSLOG_FROM_READER);
}
/*

29
kernel/sys.c
View File

@ -362,6 +362,29 @@ int unregister_reboot_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL(unregister_reboot_notifier);
/* Add backwards compatibility for stable trees. */
#ifndef PF_NO_SETAFFINITY
#define PF_NO_SETAFFINITY PF_THREAD_BOUND
#endif
static void migrate_to_reboot_cpu(void)
{
/* The boot cpu is always logical cpu 0 */
int cpu = 0;
cpu_hotplug_disable();
/* Make certain the cpu I'm about to reboot on is online */
if (!cpu_online(cpu))
cpu = cpumask_first(cpu_online_mask);
/* Prevent races with other tasks migrating this task */
current->flags |= PF_NO_SETAFFINITY;
/* Make certain I only run on the appropriate processor */
set_cpus_allowed_ptr(current, cpumask_of(cpu));
}
/**
* kernel_restart - reboot the system
* @cmd: pointer to buffer containing command to execute for restart
@ -373,7 +396,7 @@ EXPORT_SYMBOL(unregister_reboot_notifier);
void kernel_restart(char *cmd)
{
kernel_restart_prepare(cmd);
disable_nonboot_cpus();
migrate_to_reboot_cpu();
syscore_shutdown();
if (!cmd)
printk(KERN_EMERG "Restarting system.\n");
@ -400,7 +423,7 @@ static void kernel_shutdown_prepare(enum system_states state)
void kernel_halt(void)
{
kernel_shutdown_prepare(SYSTEM_HALT);
disable_nonboot_cpus();
migrate_to_reboot_cpu();
syscore_shutdown();
printk(KERN_EMERG "System halted.\n");
kmsg_dump(KMSG_DUMP_HALT);
@ -419,7 +442,7 @@ void kernel_power_off(void)
kernel_shutdown_prepare(SYSTEM_POWER_OFF);
if (pm_power_off_prepare)
pm_power_off_prepare();
disable_nonboot_cpus();
migrate_to_reboot_cpu();
syscore_shutdown();
printk(KERN_EMERG "Power down.\n");
kmsg_dump(KMSG_DUMP_POWEROFF);

2
lib/mpi/mpicoder.c
View File

@ -37,7 +37,7 @@ MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes)
mpi_limb_t a;
MPI val = NULL;
while (nbytes >= 0 && buffer[0] == 0) {
while (nbytes > 0 && buffer[0] == 0) {
buffer++;
nbytes--;
}

2
mm/frontswap.c
View File

@ -319,7 +319,7 @@ void __frontswap_invalidate_area(unsigned type)
return;
frontswap_ops->invalidate_area(type);
atomic_set(&sis->frontswap_pages, 0);
memset(sis->frontswap_map, 0, sis->max / sizeof(long));
bitmap_zero(sis->frontswap_map, sis->max);
}
clear_bit(type, need_init);
}

2
mm/hugetlb.c
View File

@ -2839,7 +2839,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
if (ptep) {
entry = huge_ptep_get(ptep);
if (unlikely(is_hugetlb_entry_migration(entry))) {
migration_entry_wait(mm, (pmd_t *)ptep, address);
migration_entry_wait_huge(mm, ptep);
return 0;
} else if (unlikely(is_hugetlb_entry_hwpoisoned(entry)))
return VM_FAULT_HWPOISON_LARGE |

14
mm/memcontrol.c
View File

@ -1199,7 +1199,6 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
mz = mem_cgroup_zoneinfo(root, nid, zid);
iter = &mz->reclaim_iter[reclaim->priority];
last_visited = iter->last_visited;
if (prev && reclaim->generation != iter->generation) {
iter->last_visited = NULL;
goto out_unlock;
@ -1218,13 +1217,12 @@ struct mem_cgroup *mem_cgroup_iter(struct mem_cgroup *root,
* is alive.
*/
dead_count = atomic_read(&root->dead_count);
smp_rmb();
last_visited = iter->last_visited;
if (last_visited) {
if ((dead_count != iter->last_dead_count) ||
!css_tryget(&last_visited->css)) {
if (dead_count == iter->last_dead_count) {
smp_rmb();
last_visited = iter->last_visited;
if (last_visited &&
!css_tryget(&last_visited->css))
last_visited = NULL;
}
}
}
@ -3141,8 +3139,6 @@ int memcg_update_cache_size(struct kmem_cache *s, int num_groups)
return -ENOMEM;
}
INIT_WORK(&s->memcg_params->destroy,
kmem_cache_destroy_work_func);
s->memcg_params->is_root_cache = true;
/*

23
mm/migrate.c
View File

@ -200,15 +200,14 @@ static void remove_migration_ptes(struct page *old, struct page *new)
* get to the page and wait until migration is finished.
* When we return from this function the fault will be retried.
*/
void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address)
static void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
spinlock_t *ptl)
{
pte_t *ptep, pte;
spinlock_t *ptl;
pte_t pte;
swp_entry_t entry;
struct page *page;
ptep = pte_offset_map_lock(mm, pmd, address, &ptl);
spin_lock(ptl);
pte = *ptep;
if (!is_swap_pte(pte))
goto out;
@ -236,6 +235,20 @@ out:
pte_unmap_unlock(ptep, ptl);
}
void migration_entry_wait(struct mm_struct *mm, pmd_t *pmd,
unsigned long address)
{
spinlock_t *ptl = pte_lockptr(mm, pmd);
pte_t *ptep = pte_offset_map(pmd, address);
__migration_entry_wait(mm, ptep, ptl);
}
void migration_entry_wait_huge(struct mm_struct *mm, pte_t *pte)
{
spinlock_t *ptl = &(mm)->page_table_lock;
__migration_entry_wait(mm, pte, ptl);
}
#ifdef CONFIG_BLOCK
/* Returns true if all buffers are successfully locked */
static bool buffer_migrate_lock_buffers(struct buffer_head *head,

6
mm/page_alloc.c
View File

@ -1628,6 +1628,7 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
long min = mark;
long lowmem_reserve = z->lowmem_reserve[classzone_idx];
int o;
long free_cma = 0;
free_pages -= (1 << order) - 1;
if (alloc_flags & ALLOC_HIGH)
@ -1637,9 +1638,10 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
#ifdef CONFIG_CMA
/* If allocation can't use CMA areas don't use free CMA pages */
if (!(alloc_flags & ALLOC_CMA))
free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES);
free_cma = zone_page_state(z, NR_FREE_CMA_PAGES);
#endif
if (free_pages <= min + lowmem_reserve)
if (free_pages - free_cma <= min + lowmem_reserve)
return false;
for (o = 0; o < order; o++) {
/* At the next order, this order's pages become unavailable */

18
mm/swap_state.c
View File

@ -336,8 +336,24 @@ struct page *read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
* Swap entry may have been freed since our caller observed it.
*/
err = swapcache_prepare(entry);
if (err == -EEXIST) { /* seems racy */
if (err == -EEXIST) {
radix_tree_preload_end();
/*
* We might race against get_swap_page() and stumble
* across a SWAP_HAS_CACHE swap_map entry whose page
* has not been brought into the swapcache yet, while
* the other end is scheduled away waiting on discard
* I/O completion at scan_swap_map().
*
* In order to avoid turning this transitory state
* into a permanent loop around this -EEXIST case
* if !CONFIG_PREEMPT and the I/O completion happens
* to be waiting on the CPU waitqueue where we are now
* busy looping, we just conditionally invoke the
* scheduler here, if there are some more important
* tasks to run.
*/
cond_resched();
continue;
}
if (err) { /* swp entry is obsolete ? */

2
mm/swapfile.c
View File

@ -2116,7 +2116,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
}
/* frontswap enabled? set up bit-per-page map for frontswap */
if (frontswap_enabled)
frontswap_map = vzalloc(maxpages / sizeof(long));
frontswap_map = vzalloc(BITS_TO_LONGS(maxpages) * sizeof(long));
if (p->bdev) {
if (blk_queue_nonrot(bdev_get_queue(p->bdev))) {