On Tue, 13 Sep 2011 15:40:36 -0500
Seth Jennings [off-list ref] wrote:

Hey Dan,

I get the following compile warnings:

mm/frontswap.c: In function a??init_frontswapa??:
mm/frontswap.c:264:5: warning: passing argument 4 of a??debugfs_create_size_ta?? from incompatible pointer type
include/linux/debugfs.h:68:16: note: expected a??size_t *a?? but argument is of type a??long unsigned int *a??
mm/frontswap.c:266:5: warning: passing argument 4 of a??debugfs_create_size_ta?? from incompatible pointer type
include/linux/debugfs.h:68:16: note: expected a??size_t *a?? but argument is of type a??long unsigned int *a??
mm/frontswap.c:268:5: warning: passing argument 4 of a??debugfs_create_size_ta?? from incompatible pointer type
include/linux/debugfs.h:68:16: note: expected a??size_t *a?? but argument is of type a??long unsigned int *a??
mm/frontswap.c:270:5: warning: passing argument 4 of a??debugfs_create_size_ta?? from incompatible pointer type
include/linux/debugfs.h:68:16: note: expected a??size_t *a?? but argument is of type a??long unsigned int *a??

size_t is platform dependent but is generally "unsigned int"
for 32-bit and "unsigned long" for 64-bit.

I think just typecasting these to size_t * would fix it.

That's very risky.

On 09/13/2011 12:40 PM, Dan Magenheimer wrote:

quoted

+#ifdef CONFIG_DEBUG_FS
+	struct dentry *root = debugfs_create_dir("frontswap", NULL);
+	if (root == NULL)
+		return -ENXIO;
+	debugfs_create_size_t("gets", S_IRUGO,
+				root, &frontswap_gets);
+	debugfs_create_size_t("succ_puts", S_IRUGO,
+				root, &frontswap_succ_puts);
+	debugfs_create_size_t("puts", S_IRUGO,
+				root, &frontswap_failed_puts);
+	debugfs_create_size_t("invalidates", S_IRUGO,
+				root, &frontswap_invalidates);
+#endif

Make them u32 and use debugfs_create_x32(), perhaps.  Or create
debugfs_create_ulong().

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