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authorLinus Torvalds <torvalds@linux-foundation.org>2012-10-12 10:46:03 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-12 10:46:03 +0900
commit40924754f2cabd5d9af4bcd4dcecc362b5e0baa1 (patch)
treefb7c4644acf882f3ac7b0ff6f0972aecd0d77663 /mm
parentcbd8aca472134e666eee87462177f1be854ebbf8 (diff)
parent2f60d628ffd042e65e0b1d3431fb3e38d6f7c1be (diff)
Merge branch 'writeback-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux
Pull writeback fixes from Fengguang Wu: "Three trivial writeback fixes" * 'writeback-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux: CPU hotplug, writeback: Don't call writeback_set_ratelimit() too often during hotplug writeback: correct comment for move_expired_inodes() backing-dev: use kstrto* in preference to simple_strtoul
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c50
-rw-r--r--mm/page-writeback.c14
2 files changed, 37 insertions, 27 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index b41823cc05e6..d3ca2b3ee176 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -158,16 +158,16 @@ static ssize_t read_ahead_kb_store(struct device *dev,
const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned long read_ahead_kb;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
- read_ahead_kb = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);
- ret = count;
- }
- return ret;
+ ret = kstrtoul(buf, 10, &read_ahead_kb);
+ if (ret < 0)
+ return ret;
+
+ bdi->ra_pages = read_ahead_kb >> (PAGE_SHIFT - 10);
+
+ return count;
}
#define K(pages) ((pages) << (PAGE_SHIFT - 10))
@@ -187,16 +187,17 @@ static ssize_t min_ratio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned int ratio;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &ratio);
+ if (ret < 0)
+ return ret;
+
+ ret = bdi_set_min_ratio(bdi, ratio);
+ if (!ret)
+ ret = count;
- ratio = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- ret = bdi_set_min_ratio(bdi, ratio);
- if (!ret)
- ret = count;
- }
return ret;
}
BDI_SHOW(min_ratio, bdi->min_ratio)
@@ -205,16 +206,17 @@ static ssize_t max_ratio_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct backing_dev_info *bdi = dev_get_drvdata(dev);
- char *end;
unsigned int ratio;
- ssize_t ret = -EINVAL;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &ratio);
+ if (ret < 0)
+ return ret;
+
+ ret = bdi_set_max_ratio(bdi, ratio);
+ if (!ret)
+ ret = count;
- ratio = simple_strtoul(buf, &end, 10);
- if (*buf && (end[0] == '\0' || (end[0] == '\n' && end[1] == '\0'))) {
- ret = bdi_set_max_ratio(bdi, ratio);
- if (!ret)
- ret = count;
- }
return ret;
}
BDI_SHOW(max_ratio, bdi->max_ratio)
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 5ad5ce23c1e0..830893b2b3c7 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1602,10 +1602,18 @@ void writeback_set_ratelimit(void)
}
static int __cpuinit
-ratelimit_handler(struct notifier_block *self, unsigned long u, void *v)
+ratelimit_handler(struct notifier_block *self, unsigned long action,
+ void *hcpu)
{
- writeback_set_ratelimit();
- return NOTIFY_DONE;
+
+ switch (action & ~CPU_TASKS_FROZEN) {
+ case CPU_ONLINE:
+ case CPU_DEAD:
+ writeback_set_ratelimit();
+ return NOTIFY_OK;
+ default:
+ return NOTIFY_DONE;
+ }
}
static struct notifier_block __cpuinitdata ratelimit_nb = {