D38159.diff
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	diff --git a/sys/compat/linuxkpi/common/include/linux/sysfs.h b/sys/compat/linuxkpi/common/include/linux/sysfs.h
	--- a/sys/compat/linuxkpi/common/include/linux/sysfs.h
	+++ b/sys/compat/linuxkpi/common/include/linux/sysfs.h
	@@ -314,6 +314,24 @@
	return (i);
	}

	+static inline int
	+sysfs_emit_at(char buf, int at, const char fmt, ...)
	+{
	+ va_list args;
	+ int i;
	+
	+ if (!buf \|\| offset_in_page(buf) \|\| at < 0 \|\| at >= PAGE_SIZE) {
	+ pr_warn("invalid sysfs_emit: buf:%p at:%d\n", buf, at);
	+ return (0);
	+ }
	+
	+ va_start(args, fmt);
	+ i = vscnprintf(buf + at, PAGE_SIZE - at, fmt, args);
	+ va_end(args);
	+
	+ return (i);
	+}
	+
	#define sysfs_attr_init(attr) do {} while(0)

	#endif /* _LINUXKPI_LINUX_SYSFS_H_ */