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authorRichard Weinberger <richard@nod.at>2015-10-26 00:26:09 +0300
committerRichard Weinberger <richard@nod.at>2015-11-07 00:49:12 +0300
commit70c8205f40a385383b0c81f59550cf27273bf912 (patch)
tree3186e2e340000c4cb2b237460d6cb68b52e59003 /arch/um
parent1b2411c283e8e178b1c57d07f7fe082442a0927b (diff)
downloadlinux-70c8205f40a385383b0c81f59550cf27273bf912.tar.xz
um: Report host OOM more nicely
If UML runs on the host side out of memory, report this condition more nicely. Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/kernel/tlb.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/um/kernel/tlb.c b/arch/um/kernel/tlb.c
index 2077248e8a72..3777b82759bd 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);