Re: [PATCH v8 8/9] tmpfs: Expose filesystem features via sysfs

[André Almeida <andrealmeid@xxxxxxxxxx>]

Em 31/10/2024 14:31, André Almeida escreveu:
> Hi Nathan,
>
> Em 31/10/2024 02:18, Nathan Chancellor escreveu:
> > Hi André,

[...]

> > If there is any patch I can test or further information I can provide, I
> > am more than happy to do so.

I found the issue, was just the DEVICE_ macro that I wasn't supposed to 
use inside of tmpfs, this diff solved the error for me, I will send a 
proper patch in a moment:

-- >8 --

diff --git a/mm/shmem.c b/mm/shmem.c
index 971e6f1184a5..db52c34d5020 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -5551,12 +5551,21 @@ EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp);

 #if defined(CONFIG_SYSFS) && defined(CONFIG_TMPFS)
 #if IS_ENABLED(CONFIG_UNICODE)
-static DEVICE_STRING_ATTR_RO(casefold, 0444, "supported");
+static ssize_t casefold_show(struct kobject *kobj, struct 
kobj_attribute *a,
+                       char *buf)
+{
+               return sysfs_emit(buf, "supported\n");
+}
+static struct kobj_attribute tmpfs_attr_casefold = {
+               .attr = { .name = "casefold", .mode = 0444 },
+               .show = casefold_show,
+               .store = NULL,
+};
 #endif

 static struct attribute *tmpfs_attributes[] = {
 #if IS_ENABLED(CONFIG_UNICODE)
-       &dev_attr_casefold.attr.attr,
+       &tmpfs_attr_casefold.attr,
 #endif
        NULL
 };