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authorLinus Torvalds <torvalds@linux-foundation.org>2015-08-14 17:05:26 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-08-14 17:05:26 -0700
commit8394a1b7151c54c6be66551a0ca1041b398029b6 (patch)
tree3113992bcc202cc17ea579dbcf3ac6bb0e4cdf15
parentfbd9163f1c89f9591c03981bdb2d1de7f6e27c11 (diff)
parent7f11c47605cbe7cb76fd2f8607f452d4afe919f5 (diff)
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Merge branch 'akpm' (patches from Andrew)
Merge fixes from Andrew Morton: "11 fixes" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: Update maintainers for DRM STI driver mm: cma: mark cma_bitmap_maxno() inline in header zram: fix pool name truncation memory-hotplug: fix wrong edge when hot add a new node .mailmap: Andrey Ryabinin has moved ipc/sem.c: update/correct memory barriers mm/hwpoison: fix panic due to split huge zero page ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem() ipc,sem: fix use after free on IPC_RMID after a task using same semaphore set exits mm/hwpoison: fix fail isolate hugetlbfs page w/ refcount held mm/hwpoison: fix page refcount of unknown non LRU page
-rw-r--r--.mailmap1
-rw-r--r--MAINTAINERS9
-rw-r--r--drivers/block/zram/zram_drv.c6
-rw-r--r--ipc/sem.c47
-rw-r--r--mm/cma.h2
-rw-r--r--mm/kasan/kasan.c2
-rw-r--r--mm/kasan/report.c2
-rw-r--r--mm/memory-failure.c22
-rw-r--r--mm/memory_hotplug.c3
-rw-r--r--mm/page_alloc.c8
10 files changed, 74 insertions, 28 deletions
diff --git a/.mailmap b/.mailmap
index b4091b7a78fe..4b31af54ccd5 100644
--- a/.mailmap
+++ b/.mailmap
@@ -17,6 +17,7 @@ Aleksey Gorelov <aleksey_gorelov@phoenix.com>
Al Viro <viro@ftp.linux.org.uk>
Al Viro <viro@zenIV.linux.org.uk>
Andreas Herrmann <aherrman@de.ibm.com>
+Andrey Ryabinin <ryabinin.a.a@gmail.com> <a.ryabinin@samsung.com>
Andrew Morton <akpm@linux-foundation.org>
Andrew Vasquez <andrew.vasquez@qlogic.com>
Andy Adamson <andros@citi.umich.edu>
diff --git a/MAINTAINERS b/MAINTAINERS
index a9ae6c105520..569568f6644f 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3587,6 +3587,15 @@ S: Maintained
F: drivers/gpu/drm/rockchip/
F: Documentation/devicetree/bindings/video/rockchip*
+DRM DRIVERS FOR STI
+M: Benjamin Gaignard <benjamin.gaignard@linaro.org>
+M: Vincent Abriou <vincent.abriou@st.com>
+L: dri-devel@lists.freedesktop.org
+T: git http://git.linaro.org/people/benjamin.gaignard/kernel.git
+S: Maintained
+F: drivers/gpu/drm/sti
+F: Documentation/devicetree/bindings/gpu/st,stih4xx.txt
+
DSBR100 USB FM RADIO DRIVER
M: Alexey Klimov <klimov.linux@gmail.com>
L: linux-media@vger.kernel.org
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index fb655e8d1e3b..763301c7828c 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -496,10 +496,9 @@ static void zram_meta_free(struct zram_meta *meta, u64 disksize)
kfree(meta);
}
-static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize)
+static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize)
{
size_t num_pages;
- char pool_name[8];
struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL);
if (!meta)
@@ -512,7 +511,6 @@ static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize)
goto out_error;
}
- snprintf(pool_name, sizeof(pool_name), "zram%d", device_id);
meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM);
if (!meta->mem_pool) {
pr_err("Error creating memory pool\n");
@@ -1031,7 +1029,7 @@ static ssize_t disksize_store(struct device *dev,
return -EINVAL;
disksize = PAGE_ALIGN(disksize);
- meta = zram_meta_alloc(zram->disk->first_minor, disksize);
+ meta = zram_meta_alloc(zram->disk->disk_name, disksize);
if (!meta)
return -ENOMEM;
diff --git a/ipc/sem.c b/ipc/sem.c
index bc3d530cb23e..b471e5a3863d 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -253,6 +253,16 @@ static void sem_rcu_free(struct rcu_head *head)
}
/*
+ * spin_unlock_wait() and !spin_is_locked() are not memory barriers, they
+ * are only control barriers.
+ * The code must pair with spin_unlock(&sem->lock) or
+ * spin_unlock(&sem_perm.lock), thus just the control barrier is insufficient.
+ *
+ * smp_rmb() is sufficient, as writes cannot pass the control barrier.
+ */
+#define ipc_smp_acquire__after_spin_is_unlocked() smp_rmb()
+
+/*
* Wait until all currently ongoing simple ops have completed.
* Caller must own sem_perm.lock.
* New simple ops cannot start, because simple ops first check
@@ -275,6 +285,7 @@ static void sem_wait_array(struct sem_array *sma)
sem = sma->sem_base + i;
spin_unlock_wait(&sem->lock);
}
+ ipc_smp_acquire__after_spin_is_unlocked();
}
/*
@@ -327,13 +338,12 @@ static inline int sem_lock(struct sem_array *sma, struct sembuf *sops,
/* Then check that the global lock is free */
if (!spin_is_locked(&sma->sem_perm.lock)) {
/*
- * The ipc object lock check must be visible on all
- * cores before rechecking the complex count. Otherwise
- * we can race with another thread that does:
+ * We need a memory barrier with acquire semantics,
+ * otherwise we can race with another thread that does:
* complex_count++;
* spin_unlock(sem_perm.lock);
*/
- smp_rmb();
+ ipc_smp_acquire__after_spin_is_unlocked();
/*
* Now repeat the test of complex_count:
@@ -2074,17 +2084,28 @@ void exit_sem(struct task_struct *tsk)
rcu_read_lock();
un = list_entry_rcu(ulp->list_proc.next,
struct sem_undo, list_proc);
- if (&un->list_proc == &ulp->list_proc)
- semid = -1;
- else
- semid = un->semid;
+ if (&un->list_proc == &ulp->list_proc) {
+ /*
+ * We must wait for freeary() before freeing this ulp,
+ * in case we raced with last sem_undo. There is a small
+ * possibility where we exit while freeary() didn't
+ * finish unlocking sem_undo_list.
+ */
+ spin_unlock_wait(&ulp->lock);
+ rcu_read_unlock();
+ break;
+ }
+ spin_lock(&ulp->lock);
+ semid = un->semid;
+ spin_unlock(&ulp->lock);
+ /* exit_sem raced with IPC_RMID, nothing to do */
if (semid == -1) {
rcu_read_unlock();
- break;
+ continue;
}
- sma = sem_obtain_object_check(tsk->nsproxy->ipc_ns, un->semid);
+ sma = sem_obtain_object_check(tsk->nsproxy->ipc_ns, semid);
/* exit_sem raced with IPC_RMID, nothing to do */
if (IS_ERR(sma)) {
rcu_read_unlock();
@@ -2112,9 +2133,11 @@ void exit_sem(struct task_struct *tsk)
ipc_assert_locked_object(&sma->sem_perm);
list_del(&un->list_id);
- spin_lock(&ulp->lock);
+ /* we are the last process using this ulp, acquiring ulp->lock
+ * isn't required. Besides that, we are also protected against
+ * IPC_RMID as we hold sma->sem_perm lock now
+ */
list_del_rcu(&un->list_proc);
- spin_unlock(&ulp->lock);
/* perform adjustments registered in un */
for (i = 0; i < sma->sem_nsems; i++) {
diff --git a/mm/cma.h b/mm/cma.h
index 1132d733556d..17c75a4246c8 100644
--- a/mm/cma.h
+++ b/mm/cma.h
@@ -16,7 +16,7 @@ struct cma {
extern struct cma cma_areas[MAX_CMA_AREAS];
extern unsigned cma_area_count;
-static unsigned long cma_bitmap_maxno(struct cma *cma)
+static inline unsigned long cma_bitmap_maxno(struct cma *cma)
{
return cma->count >> cma->order_per_bit;
}
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 6c513a63ea84..7b28e9cdf1c7 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -2,7 +2,7 @@
* This file contains shadow memory manipulation code.
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
- * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
+ * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
*
* Some of code borrowed from https://github.com/xairy/linux by
* Andrey Konovalov <adech.fo@gmail.com>
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 680ceedf810a..e07c94fbd0ac 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -2,7 +2,7 @@
* This file contains error reporting code.
*
* Copyright (c) 2014 Samsung Electronics Co., Ltd.
- * Author: Andrey Ryabinin <a.ryabinin@samsung.com>
+ * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
*
* Some of code borrowed from https://github.com/xairy/linux by
* Andrey Konovalov <adech.fo@gmail.com>
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index ea5a93659488..1f4446a90cef 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1146,8 +1146,11 @@ int memory_failure(unsigned long pfn, int trapno, int flags)
}
if (!PageHuge(p) && PageTransHuge(hpage)) {
- if (unlikely(split_huge_page(hpage))) {
- pr_err("MCE: %#lx: thp split failed\n", pfn);
+ if (!PageAnon(hpage) || unlikely(split_huge_page(hpage))) {
+ if (!PageAnon(hpage))
+ pr_err("MCE: %#lx: non anonymous thp\n", pfn);
+ else
+ pr_err("MCE: %#lx: thp split failed\n", pfn);
if (TestClearPageHWPoison(p))
atomic_long_sub(nr_pages, &num_poisoned_pages);
put_page(p);
@@ -1538,6 +1541,8 @@ static int get_any_page(struct page *page, unsigned long pfn, int flags)
*/
ret = __get_any_page(page, pfn, 0);
if (!PageLRU(page)) {
+ /* Drop page reference which is from __get_any_page() */
+ put_page(page);
pr_info("soft_offline: %#lx: unknown non LRU page type %lx\n",
pfn, page->flags);
return -EIO;
@@ -1567,13 +1572,12 @@ static int soft_offline_huge_page(struct page *page, int flags)
unlock_page(hpage);
ret = isolate_huge_page(hpage, &pagelist);
- if (ret) {
- /*
- * get_any_page() and isolate_huge_page() takes a refcount each,
- * so need to drop one here.
- */
- put_page(hpage);
- } else {
+ /*
+ * get_any_page() and isolate_huge_page() takes a refcount each,
+ * so need to drop one here.
+ */
+ put_page(hpage);
+ if (!ret) {
pr_info("soft offline: %#lx hugepage failed to isolate\n", pfn);
return -EBUSY;
}
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 003dbe4b060d..6da82bcb0a8b 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1277,6 +1277,7 @@ int __ref add_memory(int nid, u64 start, u64 size)
/* create new memmap entry */
firmware_map_add_hotplug(start, start + size, "System RAM");
+ memblock_add_node(start, size, nid);
goto out;
@@ -2013,6 +2014,8 @@ void __ref remove_memory(int nid, u64 start, u64 size)
/* remove memmap entry */
firmware_map_remove(start, start + size, "System RAM");
+ memblock_free(start, size);
+ memblock_remove(start, size);
arch_remove_memory(start, size);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index beda41710802..df959b7d6085 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5060,6 +5060,10 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
{
unsigned long zone_start_pfn, zone_end_pfn;
+ /* When hotadd a new node, the node should be empty */
+ if (!node_start_pfn && !node_end_pfn)
+ return 0;
+
/* Get the start and end of the zone */
zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type];
zone_end_pfn = arch_zone_highest_possible_pfn[zone_type];
@@ -5123,6 +5127,10 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
unsigned long zone_start_pfn, zone_end_pfn;
+ /* When hotadd a new node, the node should be empty */
+ if (!node_start_pfn && !node_end_pfn)
+ return 0;
+
zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high);
zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high);