From: Andrey Konovalov andreyknvl@google.com
[ Upstream commit 2c547f9da0539ad1f7ef7f08c8c82036d61b011a ]
When CONFIG_EFI is not enabled, we might get an undefined reference to efi_enter_virtual_mode() error, if this efi_enabled() call isn't inlined into start_kernel(). This happens in particular, if start_kernel() is annodated with __no_sanitize_address.
Reported-by: kernel test robot lkp@intel.com Signed-off-by: Andrey Konovalov andreyknvl@google.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Acked-by: Ard Biesheuvel ardb@kernel.org Cc: Alexander Potapenko glider@google.com Cc: Andrey Ryabinin aryabinin@virtuozzo.com Cc: Catalin Marinas catalin.marinas@arm.com Cc: Dmitry Vyukov dvyukov@google.com Cc: Elena Petrova lenaptr@google.com Cc: Marco Elver elver@google.com Cc: Vincenzo Frascino vincenzo.frascino@arm.com Cc: Walter Wu walter-zh.wu@mediatek.com Link: http://lkml.kernel.org/r/6514652d3a32d3ed33d6eb5c91d0af63bf0d1a0c.1596544734... Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/efi.h | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/include/linux/efi.h b/include/linux/efi.h index 05c47f857383e..73db1ae04cef8 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -606,7 +606,11 @@ extern void *efi_get_pal_addr (void); extern void efi_map_pal_code (void); extern void efi_memmap_walk (efi_freemem_callback_t callback, void *arg); extern void efi_gettimeofday (struct timespec64 *ts); +#ifdef CONFIG_EFI extern void efi_enter_virtual_mode (void); /* switch EFI to virtual mode, if possible */ +#else +static inline void efi_enter_virtual_mode (void) {} +#endif #ifdef CONFIG_X86 extern efi_status_t efi_query_variable_store(u32 attributes, unsigned long size,