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author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-05-14 05:45:59 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-05-14 05:45:59 -0300 |
commit | c91265cd0efb83778f015b4d4b1129bd2cfd075e (patch) | |
tree | c9e2ebed36b5a70f0d7c58cb7e3d36e823ccde9f /drivers/xen/balloon.c | |
parent | a5cdf7364020a61375af3c8aa23e09181f5c2c6c (diff) |
Linux-libre 4.5.4-gnupck-4.5.4-gnu
Diffstat (limited to 'drivers/xen/balloon.c')
-rw-r--r-- | drivers/xen/balloon.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 12eab503e..364bc4461 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -152,6 +152,8 @@ static DECLARE_WAIT_QUEUE_HEAD(balloon_wq); static void balloon_process(struct work_struct *work); static DECLARE_DELAYED_WORK(balloon_worker, balloon_process); +static void release_memory_resource(struct resource *resource); + /* When ballooning out (allocating memory to return to Xen) we don't really want the kernel to try too hard since that can trigger the oom killer. */ #define GFP_BALLOON \ @@ -268,6 +270,20 @@ static struct resource *additional_memory_resource(phys_addr_t size) return NULL; } +#ifdef CONFIG_SPARSEMEM + { + unsigned long limit = 1UL << (MAX_PHYSMEM_BITS - PAGE_SHIFT); + unsigned long pfn = res->start >> PAGE_SHIFT; + + if (pfn > limit) { + pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n", + pfn, limit); + release_memory_resource(res); + return NULL; + } + } +#endif + return res; } |