linux-kernel - [PATCH 4.9 37/78] efi: provide empty efi_enter_virtual

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Message-Id: <20200901150926.592332088@linuxfoundation.org>
Date:   Tue,  1 Sep 2020 17:10:13 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Walter Wu <walter-zh.wu@...iatek.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 37/78] efi: provide empty efi_enter_virtual_mode implementation

From: Andrey Konovalov <andreyknvl@...gle.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@...el.com>
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Acked-by: Ard Biesheuvel <ardb@...nel.org>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Elena Petrova <lenaptr@...gle.com>
Cc: Marco Elver <elver@...gle.com>
Cc: Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Walter Wu <walter-zh.wu@...iatek.com>
Link: http://lkml.kernel.org/r/6514652d3a32d3ed33d6eb5c91d0af63bf0d1a0c.1596544734.git.andreyknvl@google.com
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/linux/efi.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index 02c4f16685b69..69605956beb85 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -910,7 +910,11 @@ 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 void efi_late_init(void);
 extern void efi_free_boot_services(void);
-- 
2.25.1