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

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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>
(cherry picked from commit 760b61d76d)

Change-Id: I66a57af4ecd8e7f908d8d049b631c03054d0f5b2
This commit is contained in:
Ard Biesheuvel
2017-08-18 20:49:35 +01:00
committed by Greg Hackmann
parent ae92169eb9
commit 19445a0705
1 changed files with 3 additions and 0 deletions
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3
arch/arm64/include/asm/efi.h
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@@ -55,6 +55,9 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
#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)
{
}