linux/ctype.h is needed for isalnum() to avoid a build error: drivers/platform/x86/samsung-laptop.c: In function ‘samsung_sabi_diag’: drivers/platform/x86/samsung-laptop.c:1306: error: implicit declaration of function ‘isalnum’ Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> --- drivers/platform/x86/samsung-laptop.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c --- a/drivers/platform/x86/samsung-laptop.c +++ b/drivers/platform/x86/samsung-laptop.c @@ -25,6 +25,7 @@ #include <linux/acpi.h> #include <linux/seq_file.h> #include <linux/debugfs.h> +#include <linux/ctype.h> /* * This driver is needed because a number of Samsung laptops do not hook
