From mboxrd@z Thu Jan 1 00:00:00 1970 From: shijie.huang@arm.com (Huang Shijie) Date: Mon, 14 Nov 2016 15:07:37 +0800 Subject: [PATCH v2 4/6] mm: mempolicy: intruduce a helper huge_nodemask() In-Reply-To: <1479107259-2011-1-git-send-email-shijie.huang@arm.com> References: <1479107259-2011-1-git-send-email-shijie.huang@arm.com> Message-ID: <1479107259-2011-5-git-send-email-shijie.huang@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org This patch intruduces a new helper huge_nodemask(), we can use it to get the node mask. This idea of the function is from the huge_zonelist(). Signed-off-by: Huang Shijie --- include/linux/mempolicy.h | 8 ++++++++ mm/mempolicy.c | 20 ++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h index 5e5b296..01173c6 100644 --- a/include/linux/mempolicy.h +++ b/include/linux/mempolicy.h @@ -145,6 +145,8 @@ extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, enum mpol_rebind_step step); extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); +extern nodemask_t *huge_nodemask(struct vm_area_struct *vma, + unsigned long addr); extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol, nodemask_t **nodemask); @@ -261,6 +263,12 @@ static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) { } +static inline nodemask_t *huge_nodemask(struct vm_area_struct *vma, + unsigned long addr) +{ + return NULL; +} + static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol, nodemask_t **nodemask) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 6d3639e..4830dd6 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1800,6 +1800,26 @@ static inline unsigned interleave_nid(struct mempolicy *pol, #ifdef CONFIG_HUGETLBFS /* + * huge_nodemask(@vma, @addr) + * @vma: virtual memory area whose policy is sought + * @addr: address in @vma for shared policy lookup and interleave policy + * + * If the effective policy is BIND, returns a pointer to the mempolicy's + * @nodemask. + */ +nodemask_t *huge_nodemask(struct vm_area_struct *vma, unsigned long addr) +{ + nodemask_t *nodes_mask = NULL; + struct mempolicy *mpol = get_vma_policy(vma, addr); + + if (mpol->mode == MPOL_BIND) + nodes_mask = &mpol->v.nodes; + mpol_cond_put(mpol); + + return nodes_mask; +} + +/* * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) * @vma: virtual memory area whose policy is sought * @addr: address in @vma for shared policy lookup and interleave policy -- 2.5.5