* hugetlb: ensure hugepage access is denied if hugepages are not supported
@ 2014-04-03 23:14 ` Nishanth Aravamudan
0 siblings, 0 replies; 6+ messages in thread
From: Nishanth Aravamudan @ 2014-04-03 23:14 UTC (permalink / raw)
To: linux-mm; +Cc: linuxppc-dev, nyc, benh, paulus, anton, akpm, aneesh.kumar
In KVM guests on Power, in a guest not backed by hugepages, we see the
following:
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 64 kB
HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
are not supported at boot-time, but this is only checked in
hugetlb_init(). Extract the check to a helper function, and use it in a
few relevant places.
This does make hugetlbfs not supported (not registered at all) in this
environment. I believe this is fine, as there are no valid hugepages and
that won't change at runtime.
Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index d19b30a..cc8fcc7 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
int error;
int i;
+ if (!hugepages_supported()) {
+ printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
+ return -ENOTSUPP;
+ }
+
error = bdi_init(&hugetlbfs_backing_dev_info);
if (error)
return error;
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc4..0aea8de 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -450,4 +450,14 @@ static inline spinlock_t *huge_pte_lock(struct hstate *h,
return ptl;
}
+static inline bool hugepages_supported(void)
+{
+ /*
+ * Some platform decide whether they support huge pages at boot
+ * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
+ * there is no such support
+ */
+ return HPAGE_SHIFT != 0;
+}
+
#endif /* _LINUX_HUGETLB_H */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c01cb9f..1c99585 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1949,11 +1949,7 @@ module_exit(hugetlb_exit);
static int __init hugetlb_init(void)
{
- /* Some platform decide whether they support huge pages at boot
- * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
- * there is no such support
- */
- if (HPAGE_SHIFT == 0)
+ if (!hugepages_supported())
return 0;
if (!size_to_hstate(default_hstate_size)) {
@@ -2069,6 +2065,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
unsigned long tmp;
int ret;
+ if (!hugepages_supported())
+ return -ENOTSUPP;
+
tmp = h->max_huge_pages;
if (write && h->order >= MAX_ORDER)
@@ -2122,6 +2121,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
unsigned long tmp;
int ret;
+ if (!hugepages_supported())
+ return -ENOTSUPP;
+
tmp = h->nr_overcommit_huge_pages;
if (write && h->order >= MAX_ORDER)
@@ -2147,6 +2149,8 @@ out:
void hugetlb_report_meminfo(struct seq_file *m)
{
struct hstate *h = &default_hstate;
+ if (!hugepages_supported())
+ return;
seq_printf(m,
"HugePages_Total: %5lu\n"
"HugePages_Free: %5lu\n"
@@ -2163,6 +2167,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
int hugetlb_report_node_meminfo(int nid, char *buf)
{
struct hstate *h = &default_hstate;
+ if (!hugepages_supported())
+ return 0;
return sprintf(buf,
"Node %d HugePages_Total: %5u\n"
"Node %d HugePages_Free: %5u\n"
@@ -2177,6 +2183,9 @@ void hugetlb_show_meminfo(void)
struct hstate *h;
int nid;
+ if (!hugepages_supported())
+ return;
+
for_each_node_state(nid, N_MEMORY)
for_each_hstate(h)
pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 6+ messages in thread
* hugetlb: ensure hugepage access is denied if hugepages are not supported
@ 2014-04-03 23:14 ` Nishanth Aravamudan
0 siblings, 0 replies; 6+ messages in thread
From: Nishanth Aravamudan @ 2014-04-03 23:14 UTC (permalink / raw)
To: linux-mm; +Cc: paulus, anton, nyc, akpm, linuxppc-dev, aneesh.kumar
In KVM guests on Power, in a guest not backed by hugepages, we see the
following:
AnonHugePages: 0 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 64 kB
HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
are not supported at boot-time, but this is only checked in
hugetlb_init(). Extract the check to a helper function, and use it in a
few relevant places.
This does make hugetlbfs not supported (not registered at all) in this
environment. I believe this is fine, as there are no valid hugepages and
that won't change at runtime.
Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index d19b30a..cc8fcc7 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
int error;
int i;
+ if (!hugepages_supported()) {
+ printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
+ return -ENOTSUPP;
+ }
+
error = bdi_init(&hugetlbfs_backing_dev_info);
if (error)
return error;
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc4..0aea8de 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -450,4 +450,14 @@ static inline spinlock_t *huge_pte_lock(struct hstate *h,
return ptl;
}
+static inline bool hugepages_supported(void)
+{
+ /*
+ * Some platform decide whether they support huge pages at boot
+ * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
+ * there is no such support
+ */
+ return HPAGE_SHIFT != 0;
+}
+
#endif /* _LINUX_HUGETLB_H */
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c01cb9f..1c99585 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1949,11 +1949,7 @@ module_exit(hugetlb_exit);
static int __init hugetlb_init(void)
{
- /* Some platform decide whether they support huge pages at boot
- * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
- * there is no such support
- */
- if (HPAGE_SHIFT == 0)
+ if (!hugepages_supported())
return 0;
if (!size_to_hstate(default_hstate_size)) {
@@ -2069,6 +2065,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
unsigned long tmp;
int ret;
+ if (!hugepages_supported())
+ return -ENOTSUPP;
+
tmp = h->max_huge_pages;
if (write && h->order >= MAX_ORDER)
@@ -2122,6 +2121,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
unsigned long tmp;
int ret;
+ if (!hugepages_supported())
+ return -ENOTSUPP;
+
tmp = h->nr_overcommit_huge_pages;
if (write && h->order >= MAX_ORDER)
@@ -2147,6 +2149,8 @@ out:
void hugetlb_report_meminfo(struct seq_file *m)
{
struct hstate *h = &default_hstate;
+ if (!hugepages_supported())
+ return;
seq_printf(m,
"HugePages_Total: %5lu\n"
"HugePages_Free: %5lu\n"
@@ -2163,6 +2167,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
int hugetlb_report_node_meminfo(int nid, char *buf)
{
struct hstate *h = &default_hstate;
+ if (!hugepages_supported())
+ return 0;
return sprintf(buf,
"Node %d HugePages_Total: %5u\n"
"Node %d HugePages_Free: %5u\n"
@@ -2177,6 +2183,9 @@ void hugetlb_show_meminfo(void)
struct hstate *h;
int nid;
+ if (!hugepages_supported())
+ return;
+
for_each_node_state(nid, N_MEMORY)
for_each_hstate(h)
pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: hugetlb: ensure hugepage access is denied if hugepages are not supported
2014-04-03 23:14 ` Nishanth Aravamudan
@ 2014-04-04 0:42 ` Aneesh Kumar K.V
-1 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2014-04-04 0:42 UTC (permalink / raw)
To: Nishanth Aravamudan, linux-mm
Cc: linuxppc-dev, nyc, benh, paulus, anton, akpm
Nishanth Aravamudan <nacc@linux.vnet.ibm.com> writes:
> In KVM guests on Power, in a guest not backed by hugepages, we see the
> following:
>
> AnonHugePages: 0 kB
> HugePages_Total: 0
> HugePages_Free: 0
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 64 kB
>
> HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
> are not supported at boot-time, but this is only checked in
> hugetlb_init(). Extract the check to a helper function, and use it in a
> few relevant places.
>
> This does make hugetlbfs not supported (not registered at all) in this
> environment. I believe this is fine, as there are no valid hugepages and
> that won't change at runtime.
>
> Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
>
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index d19b30a..cc8fcc7 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
> int error;
> int i;
>
> + if (!hugepages_supported()) {
> + printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
> + return -ENOTSUPP;
> + }
> +
> error = bdi_init(&hugetlbfs_backing_dev_info);
> if (error)
> return error;
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 8c43cc4..0aea8de 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -450,4 +450,14 @@ static inline spinlock_t *huge_pte_lock(struct hstate *h,
> return ptl;
> }
>
> +static inline bool hugepages_supported(void)
> +{
> + /*
> + * Some platform decide whether they support huge pages at boot
> + * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> + * there is no such support
> + */
> + return HPAGE_SHIFT != 0;
> +}
> +
> #endif /* _LINUX_HUGETLB_H */
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index c01cb9f..1c99585 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1949,11 +1949,7 @@ module_exit(hugetlb_exit);
>
> static int __init hugetlb_init(void)
> {
> - /* Some platform decide whether they support huge pages at boot
> - * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> - * there is no such support
> - */
> - if (HPAGE_SHIFT == 0)
> + if (!hugepages_supported())
> return 0;
>
> if (!size_to_hstate(default_hstate_size)) {
> @@ -2069,6 +2065,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
> unsigned long tmp;
> int ret;
>
> + if (!hugepages_supported())
> + return -ENOTSUPP;
> +
> tmp = h->max_huge_pages;
>
> if (write && h->order >= MAX_ORDER)
> @@ -2122,6 +2121,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
> unsigned long tmp;
> int ret;
>
> + if (!hugepages_supported())
> + return -ENOTSUPP;
> +
> tmp = h->nr_overcommit_huge_pages;
>
> if (write && h->order >= MAX_ORDER)
> @@ -2147,6 +2149,8 @@ out:
> void hugetlb_report_meminfo(struct seq_file *m)
> {
> struct hstate *h = &default_hstate;
> + if (!hugepages_supported())
> + return;
> seq_printf(m,
> "HugePages_Total: %5lu\n"
> "HugePages_Free: %5lu\n"
> @@ -2163,6 +2167,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
> int hugetlb_report_node_meminfo(int nid, char *buf)
> {
> struct hstate *h = &default_hstate;
> + if (!hugepages_supported())
> + return 0;
> return sprintf(buf,
> "Node %d HugePages_Total: %5u\n"
> "Node %d HugePages_Free: %5u\n"
> @@ -2177,6 +2183,9 @@ void hugetlb_show_meminfo(void)
> struct hstate *h;
> int nid;
>
> + if (!hugepages_supported())
> + return;
> +
> for_each_node_state(nid, N_MEMORY)
> for_each_hstate(h)
> pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: hugetlb: ensure hugepage access is denied if hugepages are not supported
@ 2014-04-04 0:42 ` Aneesh Kumar K.V
0 siblings, 0 replies; 6+ messages in thread
From: Aneesh Kumar K.V @ 2014-04-04 0:42 UTC (permalink / raw)
To: Nishanth Aravamudan, linux-mm; +Cc: paulus, anton, nyc, akpm, linuxppc-dev
Nishanth Aravamudan <nacc@linux.vnet.ibm.com> writes:
> In KVM guests on Power, in a guest not backed by hugepages, we see the
> following:
>
> AnonHugePages: 0 kB
> HugePages_Total: 0
> HugePages_Free: 0
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 64 kB
>
> HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
> are not supported at boot-time, but this is only checked in
> hugetlb_init(). Extract the check to a helper function, and use it in a
> few relevant places.
>
> This does make hugetlbfs not supported (not registered at all) in this
> environment. I believe this is fine, as there are no valid hugepages and
> that won't change at runtime.
>
> Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
>
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index d19b30a..cc8fcc7 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
> int error;
> int i;
>
> + if (!hugepages_supported()) {
> + printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
> + return -ENOTSUPP;
> + }
> +
> error = bdi_init(&hugetlbfs_backing_dev_info);
> if (error)
> return error;
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 8c43cc4..0aea8de 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -450,4 +450,14 @@ static inline spinlock_t *huge_pte_lock(struct hstate *h,
> return ptl;
> }
>
> +static inline bool hugepages_supported(void)
> +{
> + /*
> + * Some platform decide whether they support huge pages at boot
> + * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> + * there is no such support
> + */
> + return HPAGE_SHIFT != 0;
> +}
> +
> #endif /* _LINUX_HUGETLB_H */
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index c01cb9f..1c99585 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -1949,11 +1949,7 @@ module_exit(hugetlb_exit);
>
> static int __init hugetlb_init(void)
> {
> - /* Some platform decide whether they support huge pages at boot
> - * time. On these, such as powerpc, HPAGE_SHIFT is set to 0 when
> - * there is no such support
> - */
> - if (HPAGE_SHIFT == 0)
> + if (!hugepages_supported())
> return 0;
>
> if (!size_to_hstate(default_hstate_size)) {
> @@ -2069,6 +2065,9 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,
> unsigned long tmp;
> int ret;
>
> + if (!hugepages_supported())
> + return -ENOTSUPP;
> +
> tmp = h->max_huge_pages;
>
> if (write && h->order >= MAX_ORDER)
> @@ -2122,6 +2121,9 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,
> unsigned long tmp;
> int ret;
>
> + if (!hugepages_supported())
> + return -ENOTSUPP;
> +
> tmp = h->nr_overcommit_huge_pages;
>
> if (write && h->order >= MAX_ORDER)
> @@ -2147,6 +2149,8 @@ out:
> void hugetlb_report_meminfo(struct seq_file *m)
> {
> struct hstate *h = &default_hstate;
> + if (!hugepages_supported())
> + return;
> seq_printf(m,
> "HugePages_Total: %5lu\n"
> "HugePages_Free: %5lu\n"
> @@ -2163,6 +2167,8 @@ void hugetlb_report_meminfo(struct seq_file *m)
> int hugetlb_report_node_meminfo(int nid, char *buf)
> {
> struct hstate *h = &default_hstate;
> + if (!hugepages_supported())
> + return 0;
> return sprintf(buf,
> "Node %d HugePages_Total: %5u\n"
> "Node %d HugePages_Free: %5u\n"
> @@ -2177,6 +2183,9 @@ void hugetlb_show_meminfo(void)
> struct hstate *h;
> int nid;
>
> + if (!hugepages_supported())
> + return;
> +
> for_each_node_state(nid, N_MEMORY)
> for_each_hstate(h)
> pr_info("Node %d hugepages_total=%u hugepages_free=%u hugepages_surp=%u hugepages_size=%lukB\n",
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: hugetlb: ensure hugepage access is denied if hugepages are not supported
2014-04-03 23:14 ` Nishanth Aravamudan
@ 2014-04-09 10:25 ` Mel Gorman
-1 siblings, 0 replies; 6+ messages in thread
From: Mel Gorman @ 2014-04-09 10:25 UTC (permalink / raw)
To: Nishanth Aravamudan
Cc: linux-mm, linuxppc-dev, nyc, benh, paulus, anton, aneesh.kumar, akpm
On Thu, Apr 03, 2014 at 04:14:13PM -0700, Nishanth Aravamudan wrote:
> In KVM guests on Power, in a guest not backed by hugepages, we see the
> following:
>
> AnonHugePages: 0 kB
> HugePages_Total: 0
> HugePages_Free: 0
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 64 kB
>
> HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
> are not supported at boot-time, but this is only checked in
> hugetlb_init(). Extract the check to a helper function, and use it in a
> few relevant places.
>
> This does make hugetlbfs not supported (not registered at all) in this
> environment. I believe this is fine, as there are no valid hugepages and
> that won't change at runtime.
>
> Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
This patch looks ok but the changelog misses important information from
the original report which is probably why it fell through the cracks.
Add the fact that you encountered a problem during mount to the changelog
and resend it directly to Andrew. This part from your original report;
Currently, I am seeing the following when I `mount -t hugetlbfs
/none /dev/hugetlbfs`, and then simply do a `ls /dev/hugetlbfs`. I
think it's related to the fact that hugetlbfs is properly not
correctly setting itself up in this state?:
Unable to handle kernel paging request for data at address 0x00000031
Faulting instruction address: 0xc000000000245710
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=2048 NUMA pSeries
....
It probably slipped through the cracks because from the changelog this
looks like a minor formatting issue and not a functional fix.
>
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index d19b30a..cc8fcc7 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
> int error;
> int i;
>
> + if (!hugepages_supported()) {
> + printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
> + return -ENOTSUPP;
> + }
> +
> error = bdi_init(&hugetlbfs_backing_dev_info);
> if (error)
> return error;
KERN_ERR feels like overkill for this type of issue. KERN_INFO?
--
Mel Gorman
SUSE Labs
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: hugetlb: ensure hugepage access is denied if hugepages are not supported
@ 2014-04-09 10:25 ` Mel Gorman
0 siblings, 0 replies; 6+ messages in thread
From: Mel Gorman @ 2014-04-09 10:25 UTC (permalink / raw)
To: Nishanth Aravamudan
Cc: linux-mm, paulus, anton, nyc, akpm, linuxppc-dev, aneesh.kumar
On Thu, Apr 03, 2014 at 04:14:13PM -0700, Nishanth Aravamudan wrote:
> In KVM guests on Power, in a guest not backed by hugepages, we see the
> following:
>
> AnonHugePages: 0 kB
> HugePages_Total: 0
> HugePages_Free: 0
> HugePages_Rsvd: 0
> HugePages_Surp: 0
> Hugepagesize: 64 kB
>
> HPAGE_SHIFT == 0 in this configuration, which indicates that hugepages
> are not supported at boot-time, but this is only checked in
> hugetlb_init(). Extract the check to a helper function, and use it in a
> few relevant places.
>
> This does make hugetlbfs not supported (not registered at all) in this
> environment. I believe this is fine, as there are no valid hugepages and
> that won't change at runtime.
>
> Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
This patch looks ok but the changelog misses important information from
the original report which is probably why it fell through the cracks.
Add the fact that you encountered a problem during mount to the changelog
and resend it directly to Andrew. This part from your original report;
Currently, I am seeing the following when I `mount -t hugetlbfs
/none /dev/hugetlbfs`, and then simply do a `ls /dev/hugetlbfs`. I
think it's related to the fact that hugetlbfs is properly not
correctly setting itself up in this state?:
Unable to handle kernel paging request for data at address 0x00000031
Faulting instruction address: 0xc000000000245710
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=2048 NUMA pSeries
....
It probably slipped through the cracks because from the changelog this
looks like a minor formatting issue and not a functional fix.
>
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index d19b30a..cc8fcc7 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -1017,6 +1017,11 @@ static int __init init_hugetlbfs_fs(void)
> int error;
> int i;
>
> + if (!hugepages_supported()) {
> + printk(KERN_ERR "hugetlbfs: Disabling because there are no supported hugepage sizes\n");
> + return -ENOTSUPP;
> + }
> +
> error = bdi_init(&hugetlbfs_backing_dev_info);
> if (error)
> return error;
KERN_ERR feels like overkill for this type of issue. KERN_INFO?
--
Mel Gorman
SUSE Labs
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-04-09 10:25 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-04-03 23:14 hugetlb: ensure hugepage access is denied if hugepages are not supported Nishanth Aravamudan
2014-04-03 23:14 ` Nishanth Aravamudan
2014-04-04 0:42 ` Aneesh Kumar K.V
2014-04-04 0:42 ` Aneesh Kumar K.V
2014-04-09 10:25 ` Mel Gorman
2014-04-09 10:25 ` Mel Gorman
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.