+ efi-provide-empty-efi_enter_virtual_mode-implementation.patch added to -mm tree

+ efi-provide-empty-efi_enter_virtual_mode-implementation.patch added to -mm tree

[akpm]

The patch titled
     Subject: efi: provide empty efi_enter_virtual_mode implementation
has been added to the -mm tree.  Its filename is
     efi-provide-empty-efi_enter_virtual_mode-implementation.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/efi-provide-empty-efi_enter_virtual_mode-implementation.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/efi-provide-empty-efi_enter_virtual_mode-implementation.patch

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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@google.com>
Subject: 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.

Link: http://lkml.kernel.org/r/6514652d3a32d3ed33d6eb5c91d0af63bf0d1a0c.1596544734.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reported-by: kernel test robot <lkp@intel.com>
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>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/efi.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/linux/efi.h~efi-provide-empty-efi_enter_virtual_mode-implementation
+++ a/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,
_

Patches currently in -mm which might be from andreyknvl@google.com are

kasan-dont-tag-stacks-allocated-with-pagealloc.patch
efi-provide-empty-efi_enter_virtual_mode-implementation.patch
kasan-arm64-dont-instrument-functions-that-enable-kasan.patch
kasan-arm64-dont-instrument-functions-that-enable-kasan-v2.patch
kasan-allow-enabling-stack-tagging-for-tag-based-mode.patch
kasan-adjust-kasan_stack_oob-for-tag-based-mode.patch