If UML runs on the host side out of memory, report this
condition more nicely.
Signed-off-by: Richard Weinberger <rich...@nod.at>
---
arch/um/kernel/tlb.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 2077248..3777b82 100644
--- a/arch/um/kernel/tlb.c
+++ b/arch/um/kernel/tlb.c
@@ -50,6 +50,13 @@ struct host_vm_change {
.index = 0, \
.force = force })
+static void report_enomem(void)
+{
+ printk(KERN_ERR "UML ran out of memory on the host side! "
+ "This can happen due to a memory limitation or "
+ "vm.max_map_count has been reached.\n");
+}
+
static int do_ops(struct host_vm_change *hvc, int end,
int finished)
{
@@ -81,6 +88,9 @@ static int do_ops(struct host_vm_change *hvc, int end,
}
}
+ if (ret == -ENOMEM)
+ report_enomem();
+
return ret;
}
@@ -433,8 +443,12 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned
long address)
else if (pte_newprot(*pte))
err = protect(mm_id, address, PAGE_SIZE, prot, 1, &flush);
- if (err)
+ if (err) {
+ if (err == -ENOMEM)
+ report_enomem();
+
goto kill;
+ }
*pte = pte_mkuptodate(*pte);
--
1.8.4.5
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