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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: linux-efi@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"H . Peter Anvin" <hpa@zytor.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	linux-kernel@vger.kernel.org,
	Matt Fleming <matt@codeblueprint.co.uk>
Subject: [PATCH 02/14] efi/libstub: arm64: use hidden attribute for struct screen_info reference
Date: Fri, 18 Aug 2017 20:49:35 +0100	[thread overview]
Message-ID: <20170818194947.19347-3-ard.biesheuvel@linaro.org> (raw)
In-Reply-To: <20170818194947.19347-1-ard.biesheuvel@linaro.org>

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

Cc: Matt Fleming <matt@codeblueprint.co.uk>
Tested-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.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 8f3043aba873..464ac850c5e2 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)
 {
 }
-- 
2.11.0

  parent reply	other threads:[~2017-08-18 19:49 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-18 19:49 [GIT PULL 00/14] EFI changes for v4.14 Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 01/14] efi: arm: Don't mark ACPI reclaim memory as MEMBLOCK_NOMAP Ard Biesheuvel
2017-08-18 19:49 ` Ard Biesheuvel [this message]
2017-08-18 19:49 ` [PATCH 04/14] efi/libstub: arm64: set -fpie when building the EFI stub Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 05/14] efi: arm/arm64: Add missing assignment of efi.config_table Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 07/14] drivers/fbdev: efifb: allow BAR to be moved instead of claiming it Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 10/14] arm: efi: replace open coded constants with symbolic ones Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 12/14] firmware: dcdbas: constify attribute_group structures Ard Biesheuvel
     [not found] ` <20170818194947.19347-1-ard.biesheuvel-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2017-08-18 19:49   ` [PATCH 03/14] efi/libstub: arm64: force 'hidden' visibility for section markers Ard Biesheuvel
2017-08-18 19:49   ` [PATCH 06/14] efi/reboot: Fall back to original power-off method if EFI_RESET_SHUTDOWN returns Ard Biesheuvel
2017-08-18 19:49   ` [PATCH 08/14] arm: efi: remove forbidden values from the PE/COFF header Ard Biesheuvel
2017-08-18 19:49   ` [PATCH 09/14] arm: efi: remove pointless dummy .reloc section Ard Biesheuvel
2017-08-18 19:49   ` [PATCH 11/14] arm: efi: split zImage code and data into separate PE/COFF sections Ard Biesheuvel
2017-08-18 19:49   ` [PATCH 13/14] firmware: efi: constify attribute_group structures Ard Biesheuvel
2017-08-18 19:49 ` [PATCH 14/14] firmware: efi: esrt: " Ard Biesheuvel
2017-08-21  9:34 ` [GIT PULL 00/14] EFI changes for v4.14 Ingo Molnar

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