Implement ->proc_read_buf() so procfs copies what is read to userspace
after it unpinned the entry. Unloading configs.ko then no longer waits
for a reader that faults on its buffer. /proc/config.gz asks for
PROC_ENTRY_FULL_READS so that reading all of it at once keeps working.
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
---
kernel/configs.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/kernel/configs.c b/kernel/configs.c
index a28c79c5f713..05b12c440168 100644
--- a/kernel/configs.c
+++ b/kernel/configs.c
@@ -38,17 +38,18 @@ extern char kernel_config_data;
extern char kernel_config_data_end;
static ssize_t
-ikconfig_read_current(struct file *file, char __user *buf,
+ikconfig_read_current(struct file *file, char *buf,
size_t len, loff_t * offset)
{
- return simple_read_from_buffer(buf, len, offset,
+ return memory_read_from_buffer(buf, len, offset,
&kernel_config_data,
&kernel_config_data_end -
&kernel_config_data);
}
static const struct proc_ops config_gz_proc_ops = {
- .proc_read = ikconfig_read_current,
+ .proc_flags = PROC_ENTRY_FULL_READS,
+ .proc_read_buf = ikconfig_read_current,
.proc_lseek = default_llseek,
};
--
2.53.0