2.6.24-stable review patch. If anyone has any objections, please let us know. ------------------ From: Nishanth Aravamudan patch a3d0c6aa1bb342b9b2c7b123b52ac2f48a4d4d0a in mainline. When I replaced hugetlb_dynamic_pool with nr_overcommit_hugepages I used proc_doulongvec_minmax() directly. However, hugetlb.c's locking rules require that all counter modifications occur under the hugetlb_lock. Add a callback into the hugetlb code similar to the one for nr_hugepages. Grab the lock around the manipulation of nr_overcommit_hugepages in proc_doulongvec_minmax(). Signed-off-by: Nishanth Aravamudan Acked-by: Adam Litke Cc: David Gibson Cc: William Lee Irwin III Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- include/linux/hugetlb.h | 1 + kernel/sysctl.c | 2 +- mm/hugetlb.c | 10 ++++++++++ 3 files changed, 12 insertions(+), 1 deletion(-) --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -17,6 +17,7 @@ static inline int is_vm_hugetlb_page(str } int hugetlb_sysctl_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); +int hugetlb_overcommit_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); int hugetlb_treat_movable_handler(struct ctl_table *, int, struct file *, void __user *, size_t *, loff_t *); int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *); int follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *, struct page **, struct vm_area_struct **, unsigned long *, int *, int, int); --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -910,7 +910,7 @@ static struct ctl_table vm_table[] = { .data = &nr_overcommit_huge_pages, .maxlen = sizeof(nr_overcommit_huge_pages), .mode = 0644, - .proc_handler = &proc_doulongvec_minmax, + .proc_handler = &hugetlb_overcommit_handler, }, #endif { --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -605,6 +605,16 @@ int hugetlb_treat_movable_handler(struct return 0; } +int hugetlb_overcommit_handler(struct ctl_table *table, int write, + struct file *file, void __user *buffer, + size_t *length, loff_t *ppos) +{ + spin_lock(&hugetlb_lock); + proc_doulongvec_minmax(table, write, file, buffer, length, ppos); + spin_unlock(&hugetlb_lock); + return 0; +} + #endif /* CONFIG_SYSCTL */ int hugetlb_report_meminfo(char *buf) -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/