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efi: provide empty efi_enter_virtual_mode implementation 

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.git.andreyknvl@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2020-08-06 23:25:01 -07:00 committed by Linus Torvalds
parent 8dcc1d3466
commit 2c547f9da0
1 changed files with 4 additions and 0 deletions
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4
include/linux/efi.h
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@ -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,