linux-kernel - [PATCH v2] arm64: fix undefined reference to 'printk'

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Date:   Tue, 13 Mar 2018 13:52:36 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] arm64: fix undefined reference to 'printk'

The printk symbol was intended as a generic address that is always
exported, however that turned out to be false with CONFIG_PRINTK=n:

ERROR: "printk" [arch/arm64/kernel/arm64-reloc-test.ko] undefined!

This changes the references to memstart_addr, which should be there
regardless of configuration.

Fixes: a257e02579e4 ("arm64/kernel: don't ban ADRP to work around Cortex-A53 erratum #843419")
Acked-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
v2: fix changelog as pointed out by Ard

 arch/arm64/kernel/reloc_test_core.c | 2 +-
 arch/arm64/kernel/reloc_test_syms.S | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/reloc_test_core.c b/arch/arm64/kernel/reloc_test_core.c
index a70489c584c7..5915ce5759cc 100644
--- a/arch/arm64/kernel/reloc_test_core.c
+++ b/arch/arm64/kernel/reloc_test_core.c
@@ -45,7 +45,7 @@ static struct {
 	{ "R_AARCH64_MOVW_SABS_Gn",	signed_movw, UL(SYM64_ABS_VAL) },
 	{ "R_AARCH64_MOVW_UABS_Gn",	unsigned_movw, UL(SYM64_ABS_VAL) },
 	{ "R_AARCH64_ADR_PREL_PG_HI21",	relative_adrp, (u64)&sym64_rel },
-	{ "R_AARCH64_ADR_PREL_PG_HI21",	relative_adrp_far, (u64)&printk },
+	{ "R_AARCH64_ADR_PREL_PG_HI21",	relative_adrp_far, (u64)&memstart_addr },
 	{ "R_AARCH64_ADR_PREL_LO21",	relative_adr, (u64)&sym64_rel },
 	{ "R_AARCH64_PREL64",		relative_data64, (u64)&sym64_rel },
 	{ "R_AARCH64_PREL32",		relative_data32, (u64)&sym64_rel },
diff --git a/arch/arm64/kernel/reloc_test_syms.S b/arch/arm64/kernel/reloc_test_syms.S
index f333b4b7880d..2b8d9cb8b078 100644
--- a/arch/arm64/kernel/reloc_test_syms.S
+++ b/arch/arm64/kernel/reloc_test_syms.S
@@ -54,8 +54,8 @@ ENDPROC(relative_adrp)
 	.align	12
 	.space	0xffc
 ENTRY(relative_adrp_far)
-	adrp	x0, printk
-	add	x0, x0, #:lo12:printk
+	adrp	x0, memstart_addr
+	add	x0, x0, #:lo12:memstart_addr
 	ret
 ENDPROC(relative_adrp_far)
 
-- 
2.9.0