Merge branch 'akpm' (Andrew's patch-bomb)

Merge fixes from Andrew Morton.

* emailed from Andrew Morton <akpm@linux-foundation.org>: (14 patches)
  panic: fix stack dump print on direct call to panic()
  drivers/rtc/rtc-pl031.c: enable clock on all ST variants
  Revert "mm: vmscan: fix misused nr_reclaimed in shrink_mem_cgroup_zone()"
  hugetlb: fix race condition in hugetlb_fault()
  drivers/rtc/rtc-twl.c: use static register while reading time
  drivers/rtc/rtc-s3c.c: add placeholder for driver private data
  drivers/rtc/rtc-s3c.c: fix compilation error
  MAINTAINERS: add PCDP console maintainer
  memcg: do not open code accesses to res_counter members
  drivers/rtc/rtc-efi.c: fix section mismatch warning
  drivers/rtc/rtc-r9701.c: reset registers if invalid values are detected
  drivers/char/random.c: fix boot id uniqueness race
  memcg: fix broken boolen expression
  memcg: fix up documentation on global LRU

12 files changed, 105 insertions, 33 deletions

diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
index 4c95c0034a4b..9b1067afb224 100644
--- a/Documentation/cgroups/memory.txt
+++ b/Documentation/cgroups/memory.txt
@@ -34,8 +34,7 @@ Current Status: linux-2.6.34-mmotm(development version of 2010/April)
 
 Features:
  - accounting anonymous pages, file caches, swap caches usage and limiting them.
- - private LRU and reclaim routine. (system's global LRU and private LRU
-   work independently from each other)
+ - pages are linked to per-memcg LRU exclusively, and there is no global LRU.
  - optionally, memory+swap usage can be accounted and limited.
  - hierarchical accounting
  - soft limit
@@ -154,7 +153,7 @@ updated. page_cgroup has its own LRU on cgroup.
 2.2.1 Accounting details
 
 All mapped anon pages (RSS) and cache pages (Page Cache) are accounted.
-Some pages which are never reclaimable and will not be on the global LRU
+Some pages which are never reclaimable and will not be on the LRU
 are not accounted. We just account pages under usual VM management.
 
 RSS pages are accounted at page_fault unless they've already been accounted
diff --git a/MAINTAINERS b/MAINTAINERS
index f08bac96c431..32671e00800d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -5117,6 +5117,11 @@ F:	drivers/i2c/busses/i2c-pca-*
 F:      include/linux/i2c-algo-pca.h
 F:      include/linux/i2c-pca-platform.h
 
+PCDP - PRIMARY CONSOLE AND DEBUG PORT
+M:      Khalid Aziz <khalid.aziz@hp.com>
+S:      Maintained
+F:      drivers/firmware/pcdp.*
+
 PCI ERROR RECOVERY
 M:     Linas Vepstas <linasvepstas@gmail.com>
 L:      linux-pci@vger.kernel.org
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 54ca8b23cde3..4ec04a754733 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1260,10 +1260,15 @@ static int proc_do_uuid(ctl_table *table, int write,
         uuid = table->data;
         if (!uuid) {
                 uuid = tmp_uuid;
-                uuid[8] = 0;
-        }
-        if (uuid[8] == 0)
                 generate_random_uuid(uuid);
+        } else {
+                static DEFINE_SPINLOCK(bootid_spinlock);
+
+                spin_lock(&bootid_spinlock);
+                if (!uuid[8])
+                        generate_random_uuid(uuid);
+                spin_unlock(&bootid_spinlock);
+        }
 
         sprintf(buf, "%pU", uuid);
 
diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
index 550292304b0f..c9f890b088da 100644
--- a/drivers/rtc/rtc-efi.c
+++ b/drivers/rtc/rtc-efi.c
@@ -213,7 +213,6 @@ static struct platform_driver efi_rtc_driver = {
                 .name = "rtc-efi",
                 .owner = THIS_MODULE,
         },
-        .probe = efi_rtc_probe,
         .remove = __exit_p(efi_rtc_remove),
 };
 
diff --git a/drivers/rtc/rtc-pl031.c b/drivers/rtc/rtc-pl031.c
index 692de7360e94..684ef4bbfce4 100644
--- a/drivers/rtc/rtc-pl031.c
+++ b/drivers/rtc/rtc-pl031.c
@@ -339,8 +339,7 @@ static int pl031_probe(struct amba_device *adev, const struct amba_id *id)
         dev_dbg(&adev->dev, "revision = 0x%01x\n", ldata->hw_revision);
 
         /* Enable the clockwatch on ST Variants */
-        if ((ldata->hw_designer == AMBA_VENDOR_ST) &&
-            (ldata->hw_revision > 1))
+        if (ldata->hw_designer == AMBA_VENDOR_ST)
                 writel(readl(ldata->base + RTC_CR) | RTC_CR_CWEN,
                        ldata->base + RTC_CR);
 
diff --git a/drivers/rtc/rtc-r9701.c b/drivers/rtc/rtc-r9701.c
index 7f8e6c247935..33b6ba0afa0d 100644
--- a/drivers/rtc/rtc-r9701.c
+++ b/drivers/rtc/rtc-r9701.c
@@ -122,6 +122,7 @@ static const struct rtc_class_ops r9701_rtc_ops = {
 static int __devinit r9701_probe(struct spi_device *spi)
 {
         struct rtc_device *rtc;
+        struct rtc_time dt;
         unsigned char tmp;
         int res;
 
@@ -132,6 +133,27 @@ static int __devinit r9701_probe(struct spi_device *spi)
                 return -ENODEV;
         }
 
+        /*
+         * The device seems to be present. Now check if the registers
+         * contain invalid values. If so, try to write a default date:
+         * 2000/1/1 00:00:00
+         */
+        r9701_get_datetime(&spi->dev, &dt);
+        if (rtc_valid_tm(&dt)) {
+                dev_info(&spi->dev, "trying to repair invalid date/time\n");
+                dt.tm_sec  = 0;
+                dt.tm_min  = 0;
+                dt.tm_hour = 0;
+                dt.tm_mday = 1;
+                dt.tm_mon  = 0;
+                dt.tm_year = 100;
+
+                if (r9701_set_datetime(&spi->dev, &dt)) {
+                        dev_err(&spi->dev, "cannot repair RTC register\n");
+                        return -ENODEV;
+                }
+        }
+
         rtc = rtc_device_register("r9701",
                                 &spi->dev, &r9701_rtc_ops, THIS_MODULE);
         if (IS_ERR(rtc))
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 9ccea134a996..3f3a29752369 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -40,6 +40,10 @@ enum s3c_cpu_type {
         TYPE_S3C64XX,
 };
 
+struct s3c_rtc_drv_data {
+        int cpu_type;
+};
+
 /* I have yet to find an S3C implementation with more than one
  * of these rtc blocks in */
 
@@ -446,10 +450,12 @@ static const struct of_device_id s3c_rtc_dt_match[];
 static inline int s3c_rtc_get_driver_data(struct platform_device *pdev)
 {
 #ifdef CONFIG_OF
+        struct s3c_rtc_drv_data *data;
         if (pdev->dev.of_node) {
                 const struct of_device_id *match;
                 match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
-                return match->data;
+                data = (struct s3c_rtc_drv_data *) match->data;
+                return data->cpu_type;
         }
 #endif
         return platform_get_device_id(pdev)->driver_data;
@@ -664,20 +670,27 @@ static int s3c_rtc_resume(struct platform_device *pdev)
 #define s3c_rtc_resume  NULL
 #endif
 
+static struct s3c_rtc_drv_data s3c_rtc_drv_data_array[] = {
+        [TYPE_S3C2410] = { TYPE_S3C2410 },
+        [TYPE_S3C2416] = { TYPE_S3C2416 },
+        [TYPE_S3C2443] = { TYPE_S3C2443 },
+        [TYPE_S3C64XX] = { TYPE_S3C64XX },
+};
+
 #ifdef CONFIG_OF
 static const struct of_device_id s3c_rtc_dt_match[] = {
         {
-                .compatible = "samsung,s3c2410-rtc"
-                .data = TYPE_S3C2410,
+                .compatible = "samsung,s3c2410-rtc",
+                .data = &s3c_rtc_drv_data_array[TYPE_S3C2410],
         }, {
-                .compatible = "samsung,s3c2416-rtc"
-                .data = TYPE_S3C2416,
+                .compatible = "samsung,s3c2416-rtc",
+                .data = &s3c_rtc_drv_data_array[TYPE_S3C2416],
         }, {
-                .compatible = "samsung,s3c2443-rtc"
-                .data = TYPE_S3C2443,
+                .compatible = "samsung,s3c2443-rtc",
+                .data = &s3c_rtc_drv_data_array[TYPE_S3C2443],
         }, {
-                .compatible = "samsung,s3c6410-rtc"
-                .data = TYPE_S3C64XX,
+                .compatible = "samsung,s3c6410-rtc",
+                .data = &s3c_rtc_drv_data_array[TYPE_S3C64XX],
         },
         {},
 };
diff --git a/drivers/rtc/rtc-twl.c b/drivers/rtc/rtc-twl.c
index 4c2c6df2a9ef..258abeabf624 100644
--- a/drivers/rtc/rtc-twl.c
+++ b/drivers/rtc/rtc-twl.c
@@ -112,6 +112,7 @@ static const u8 twl6030_rtc_reg_map[] = {
 #define BIT_RTC_CTRL_REG_TEST_MODE_M             0x10
 #define BIT_RTC_CTRL_REG_SET_32_COUNTER_M        0x20
 #define BIT_RTC_CTRL_REG_GET_TIME_M              0x40
+#define BIT_RTC_CTRL_REG_RTC_V_OPT               0x80
 
 /* RTC_STATUS_REG bitfields */
 #define BIT_RTC_STATUS_REG_RUN_M                 0x02
@@ -235,25 +236,57 @@ static int twl_rtc_read_time(struct device *dev, struct rtc_time *tm)
         unsigned char rtc_data[ALL_TIME_REGS + 1];
         int ret;
         u8 save_control;
+        u8 rtc_control;
 
         ret = twl_rtc_read_u8(&save_control, REG_RTC_CTRL_REG);
-        if (ret < 0)
+        if (ret < 0) {
+                dev_err(dev, "%s: reading CTRL_REG, error %d\n", __func__, ret);
                 return ret;
+        }
+        /* for twl6030/32 make sure BIT_RTC_CTRL_REG_GET_TIME_M is clear */
+        if (twl_class_is_6030()) {
+                if (save_control & BIT_RTC_CTRL_REG_GET_TIME_M) {
+                        save_control &= ~BIT_RTC_CTRL_REG_GET_TIME_M;
+                        ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
+                        if (ret < 0) {
+                                dev_err(dev, "%s clr GET_TIME, error %d\n",
+                                        __func__, ret);
+                                return ret;
+                        }
+                }
+        }
 
-        save_control |= BIT_RTC_CTRL_REG_GET_TIME_M;
+        /* Copy RTC counting registers to static registers or latches */
+        rtc_control = save_control | BIT_RTC_CTRL_REG_GET_TIME_M;
 
-        ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
-        if (ret < 0)
+        /* for twl6030/32 enable read access to static shadowed registers */
+        if (twl_class_is_6030())
+                rtc_control |= BIT_RTC_CTRL_REG_RTC_V_OPT;
+
+        ret = twl_rtc_write_u8(rtc_control, REG_RTC_CTRL_REG);
+        if (ret < 0) {
+                dev_err(dev, "%s: writing CTRL_REG, error %d\n", __func__, ret);
                 return ret;
+        }
 
         ret = twl_i2c_read(TWL_MODULE_RTC, rtc_data,
                         (rtc_reg_map[REG_SECONDS_REG]), ALL_TIME_REGS);
 
         if (ret < 0) {
-                dev_err(dev, "rtc_read_time error %d\n", ret);
+                dev_err(dev, "%s: reading data, error %d\n", __func__, ret);
                 return ret;
         }
 
+        /* for twl6030 restore original state of rtc control register */
+        if (twl_class_is_6030()) {
+                ret = twl_rtc_write_u8(save_control, REG_RTC_CTRL_REG);
+                if (ret < 0) {
+                        dev_err(dev, "%s: restore CTRL_REG, error %d\n",
+                                __func__, ret);
+                        return ret;
+                }
+        }
+
         tm->tm_sec = bcd2bin(rtc_data[0]);
         tm->tm_min = bcd2bin(rtc_data[1]);
         tm->tm_hour = bcd2bin(rtc_data[2]);
diff --git a/kernel/panic.c b/kernel/panic.c
index 80aed44e345a..8ed89a175d79 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -97,7 +97,7 @@ void panic(const char *fmt, ...)
         /*
          * Avoid nested stack-dumping if a panic occurs during oops processing
          */
-        if (!oops_in_progress)
+        if (!test_taint(TAINT_DIE) && oops_in_progress <= 1)
                 dump_stack();
 #endif
 
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index b8ce6f450956..cd65cb19c941 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2791,6 +2791,7 @@ int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
          * so no worry about deadlock.
          */
         page = pte_page(entry);
+        get_page(page);
         if (page != pagecache_page)
                 lock_page(page);
 
@@ -2822,6 +2823,7 @@ out_page_table_lock:
         }
         if (page != pagecache_page)
                 unlock_page(page);
+        put_page(page);
 
 out_mutex:
         mutex_unlock(&hugetlb_instantiation_mutex);
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7d698df4a067..a7165a60d0a7 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2165,7 +2165,7 @@ static int __cpuinit memcg_cpu_hotplug_callback(struct notifier_block *nb,
         if (action == CPU_ONLINE)
                 return NOTIFY_OK;
 
-        if ((action != CPU_DEAD) || action != CPU_DEAD_FROZEN)
+        if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
                 return NOTIFY_OK;
 
         for_each_mem_cgroup(iter)
@@ -3763,7 +3763,7 @@ move_account:
                         goto try_to_free;
                 cond_resched();
         /* "ret" should also be checked to ensure all lists are empty. */
-        } while (memcg->res.usage > 0 || ret);
+        } while (res_counter_read_u64(&memcg->res, RES_USAGE) > 0 || ret);
 out:
         css_put(&memcg->css);
         return ret;
@@ -3778,7 +3778,7 @@ try_to_free:
         lru_add_drain_all();
         /* try to free all pages in this cgroup */
         shrink = 1;
-        while (nr_retries && memcg->res.usage > 0) {
+        while (nr_retries && res_counter_read_u64(&memcg->res, RES_USAGE) > 0) {
                 int progress;
 
                 if (signal_pending(current)) {
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 33c332bbab73..1a518684a32f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2107,12 +2107,7 @@ restart:
                  * with multiple processes reclaiming pages, the total
                  * freeing target can get unreasonably large.
                  */
-                if (nr_reclaimed >= nr_to_reclaim)
-                        nr_to_reclaim = 0;
-                else
-                        nr_to_reclaim -= nr_reclaimed;
-
-                if (!nr_to_reclaim && priority < DEF_PRIORITY)
+                if (nr_reclaimed >= nr_to_reclaim && priority < DEF_PRIORITY)
                         break;
         }
         blk_finish_plug(&plug);