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-rw-r--r--mm/fadvise.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 0df4c89..3c0f1e9 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -49,9 +49,21 @@ asmlinkage long sys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice)
goto out;
}
- if (mapping->a_ops->get_xip_page)
- /* no bad return value, but ignore advice */
+ if (mapping->a_ops->get_xip_page) {
+ switch (advice) {
+ case POSIX_FADV_NORMAL:
+ case POSIX_FADV_RANDOM:
+ case POSIX_FADV_SEQUENTIAL:
+ case POSIX_FADV_WILLNEED:
+ case POSIX_FADV_NOREUSE:
+ case POSIX_FADV_DONTNEED:
+ /* no bad return value, but ignore advice */
+ break;
+ default:
+ ret = -EINVAL;
+ }
goto out;
+ }
/* Careful about overflows. Len == 0 means "as much as possible" */
endbyte = offset + len;
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