linux-kernel - [PATCH 4/7] ARM: io-acorn: fix LTO linking without CONFIG

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Date:   Tue, 20 Feb 2018 22:59:51 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Nicolas Pitre <nico@...aro.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4/7] ARM: io-acorn: fix LTO linking without CONFIG_PRINTK

When CONFIG_LTO is enabled, we get a link error for this file
that contains a reference to printk():

arch/arm/lib/io-acorn.o: In function `outsl':
(.text+0x38): undefined reference to `printk'

Normally the file is simply dropped, but that doesn't happen
with LTO. Making the reference conditional helps, but perhaps
a better fix would be to make sure the LTO linker drops the
entire file in the same way that we normally do.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/lib/io-acorn.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/lib/io-acorn.S b/arch/arm/lib/io-acorn.S
index 69719bad674d..3522a899460b 100644
--- a/arch/arm/lib/io-acorn.S
+++ b/arch/arm/lib/io-acorn.S
@@ -27,6 +27,10 @@
  */
 ENTRY(insl)
 ENTRY(outsl)
+#ifdef CONFIG_PRINTK
 		adr	r0, .Liosl_warning
 		mov	r1, lr
 		b	printk
+#else
+		ret	lr
+#endif
-- 
2.9.0