[tip:efi/core] efi/libstub/arm64: Use hidden attribute for struct screen_info reference

[tip-bot for Ard Biesheuvel <tipbot@zytor.com>]

Commit-ID:  760b61d76da6d6a99eb245ab61abf71ca5415cea
Gitweb:     http://git.kernel.org/tip/760b61d76da6d6a99eb245ab61abf71ca5415cea
Author:     Ard Biesheuvel <ard.biesheuvel@linaro.org>
AuthorDate: Fri, 18 Aug 2017 20:49:35 +0100
Committer:  Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 21 Aug 2017 09:43:49 +0200

efi/libstub/arm64: Use hidden attribute for struct screen_info reference

To prevent the compiler from emitting absolute references to screen_info
when building position independent code, redeclare the symbol with hidden
visibility.

Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170818194947.19347-3-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/arm64/include/asm/efi.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index 8f3043a..464ac85 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -81,6 +81,9 @@ static inline unsigned long efi_get_max_initrd_addr(unsigned long dram_base,
 #define alloc_screen_info(x...)		&screen_info
 #define free_screen_info(x...)
 
+/* redeclare as 'hidden' so the compiler will generate relative references */
+extern struct screen_info screen_info __attribute__((__visibility__("hidden")));
+
 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt)
 {
 }