isofs: replace __get_free_page() with kmalloc()

isofs_readdir() allocates a temporary buffer with __get_free_page().

kmalloc() is a better API for such use and it also provides better
scalability and more debugging possibilities.

Replace use of __get_free_page() with kmalloc().

Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Link: https://patch.msgid.link/20260523-b4-fs-v1-11-275e36a83f0e@kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>

Author: rppt

fs/isofs/dir.c

@@ -13,6 +13,7 @@
  */
 #include <linux/gfp.h>
 #include <linux/filelock.h>
+#include <linux/slab.h>
 #include "isofs.h"
 
 int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode)
@@ -255,15 +256,15 @@ static int isofs_readdir(struct file *file, struct dir_context *ctx)
 	struct iso_directory_record *tmpde;
 	struct inode *inode = file_inode(file);
 
-	tmpname = (char *)__get_free_page(GFP_KERNEL);
+	tmpname = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (tmpname == NULL)
 		return -ENOMEM;
 
 	tmpde = (struct iso_directory_record *) (tmpname+1024);
 
 	result = do_isofs_readdir(inode, file, ctx, tmpname, tmpde);
 
-	free_page((unsigned long) tmpname);
+	kfree(tmpname);
 	return result;
 }