linux-kernel - [PATCH v2 2/5] efi: provide empty efi_enter_virtual

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Date:   Tue,  4 Aug 2020 14:41:25 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v2 2/5] 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@...el.com>
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 include/linux/efi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 05c47f857383..73db1ae04cef 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,
-- 
2.28.0.163.g6104cc2f0b6-goog