[PATCH 07/12] arch/x86: Declare edid_info in <asm/screen_info.h>

[Thomas Zimmermann]

The global variable edid_info contains the firmware's EDID information
as an extension to the regular screen_info on x86. Therefore move it to
<asm/screen_info.h>.

Add the Kconfig token ARCH_HAS_EDID_INFO to guard against access on
architectures that don't provide edid_info. Select it on x86.

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Borislav Petkov <bp at alien8.de>
Cc: Dave Hansen <dave.hansen at linux.intel.com>
Cc: x86 at kernel.org
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Helge Deller <deller at gmx.de>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Kees Cook <keescook at chromium.org>
Cc: "Paul E. McKenney" <paulmck at kernel.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Andrew Morton <akpm at linux-foundation.org>
Cc: Frederic Weisbecker <frederic at kernel.org>
Cc: Nicholas Piggin <npiggin at gmail.com>
Cc: Ard Biesheuvel <ardb at kernel.org>
Cc: Sami Tolvanen <samitolvanen at google.com>
Cc: Juerg Haefliger <juerg.haefliger at canonical.com>
---
 arch/Kconfig                      | 6 ++++++
 arch/x86/Kconfig                  | 1 +
 drivers/video/Kconfig             | 3 ---
 include/asm-generic/screen_info.h | 6 ++++++
 include/video/edid.h              | 3 ---
 5 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/arch/Kconfig b/arch/Kconfig
index 2f58293fd7bcb..ee9866e4df2b0 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -1466,6 +1466,12 @@ config ARCH_HAS_NONLEAF_PMD_YOUNG
 	  address translations. Page table walkers that clear the accessed bit
 	  may use this capability to reduce their search space.
 
+config ARCH_HAS_EDID_INFO
+	bool
+	help
+	  Selected by architectures that provide a global instance of
+	  edid_info.
+
 config ARCH_HAS_SCREEN_INFO
 	bool
 	help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index d7c2bf4ee403d..ee81855116be7 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -76,6 +76,7 @@ config X86
 	select ARCH_HAS_DEBUG_VM_PGTABLE	if !X86_PAE
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_EARLY_DEBUG		if KGDB
+	select ARCH_HAS_EDID_INFO
 	select ARCH_HAS_ELF_RANDOMIZE
 	select ARCH_HAS_FAST_MULTIPLIER
 	select ARCH_HAS_FORTIFY_SOURCE
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index d4a72bea56be0..8b2b9ac37c3df 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -21,9 +21,6 @@ config STI_CORE
 config VIDEO_CMDLINE
 	bool
 
-config ARCH_HAS_SCREEN_INFO
-	bool
-
 config VIDEO_NOMODESET
 	bool
 	default n
diff --git a/include/asm-generic/screen_info.h b/include/asm-generic/screen_info.h
index 6fd0e50fabfcd..5efc99c296b40 100644
--- a/include/asm-generic/screen_info.h
+++ b/include/asm-generic/screen_info.h
@@ -5,6 +5,12 @@
 
 #include <uapi/linux/screen_info.h>
 
+#include <video/edid.h>
+
+#if defined(CONFIG_ARCH_HAS_EDID_INFO)
+extern struct edid_info edid_info;
+#endif
+
 #if defined(CONFIG_ARCH_HAS_SCREEN_INFO)
 extern struct screen_info screen_info;
 #endif
diff --git a/include/video/edid.h b/include/video/edid.h
index f614371e9116a..52aabb7060321 100644
--- a/include/video/edid.h
+++ b/include/video/edid.h
@@ -4,7 +4,4 @@
 
 #include <uapi/video/edid.h>
 
-#ifdef CONFIG_X86
-extern struct edid_info edid_info;
-#endif
 #endif /* __linux_video_edid_h__ */
-- 
2.41.0