[RFC PATCH 08/11] mm/mempolicy: export replace_mempolicy for use by procfs
From: Gregory Price <hidden>
Date: 2023-11-22 21:12:30
Also in:
linux-arch, linux-doc, linux-fsdevel, linux-mm, lkml
Subsystem:
memory management, memory management - memory policy and migration, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
We will be adding a /proc/pid/mempolicy entry for use in swapping the mempolicy of a process at runtime. Export replace_mempolicy so that this can be used by that interface. Signed-off-by: Gregory Price <redacted> --- include/linux/mempolicy.h | 9 +++++++++ mm/mempolicy.c | 5 ++--- 2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 931b118336f4..b951e96a53ce 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h@@ -177,6 +177,8 @@ static inline bool mpol_is_preferred_many(struct mempolicy *pol) extern bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone); +extern long replace_mempolicy(struct task_struct *task, struct mempolicy *new, + nodemask_t *nodes); #else struct mempolicy {};
@@ -297,5 +299,12 @@ static inline bool mpol_is_preferred_many(struct mempolicy *pol) return false; } +static inline long replace_mempolicy(struct task_struct *task, + struct mempolicy *new, + nodemask_t *nodes) +{ + return -ENODEV; +} + #endif /* CONFIG_NUMA */ #endif
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index fb295ade8ad7..e0c9127571dd 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c@@ -815,9 +815,8 @@ static int mbind_range(struct vma_iterator *vmi, struct vm_area_struct *vma, } /* Attempt to replace mempolicy, release the old one if successful */ -static long replace_mempolicy(struct task_struct *task, - struct mempolicy *new, - nodemask_t *nodes) +long replace_mempolicy(struct task_struct *task, struct mempolicy *new, + nodemask_t *nodes) { struct mempolicy *old = NULL; NODEMASK_SCRATCH(scratch);
--
2.39.1