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| author | Andrea Arcangeli <aarcange@redhat.com> | 2021-01-09 18:46:59 -0500 |
|---|---|---|
| committer | Andrea Arcangeli <aarcange@redhat.com> | 2023-11-11 22:03:38 -0500 |
| commit | 5a61c9041a4485eb9607ff32e383a65346661b87 (patch) | |
| tree | c739b5219edc394e782b5552fb9518a6b4923845 | |
| parent | 78e8089e340ec80006b98c291d98dc8ac48f8bf6 (diff) | |
| download | aa-5a61c9041a4485eb9607ff32e383a65346661b87.tar.gz | |
mm: soft_dirty: fail CLEAR_REFS_SOFT_DIRTY if not built into the kernel
Notify userland it's running on a kernel with soft dirty not compiled
in.
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
| -rw-r--r-- | fs/proc/task_mmu.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index d08bc4cd996a71..058122cc5e9f33 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1218,6 +1218,11 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, type = (enum clear_refs_types)itype; if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) return -EINVAL; + if (!VM_SOFTDIRTY && type == CLEAR_REFS_SOFT_DIRTY) { + printk_once(KERN_WARNING + "soft_dirty: missing CONFIG_MEM_SOFT_DIRTY=y\n"); + return -EINVAL; + } task = get_proc_task(file_inode(file)); if (!task) |