linux-kernel - [PATCH] MIPS: paravirt: Fix undefined reference to smp

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Date:   Mon, 5 Sep 2016 15:43:40 +0100
From:   Matt Redfearn <matt.redfearn@...tec.com>
To:     Ralf Baechle <ralf@...ux-mips.org>, <linux-mips@...ux-mips.org>
CC:     Matt Redfearn <matt.redfearn@...tec.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] MIPS: paravirt: Fix undefined reference to smp_bootstrap

If the paravirt machine is compiles without CONFIG_SMP, the following
linker error occurs

arch/mips/kernel/head.o: In function `kernel_entry':
(.ref.text+0x10): undefined reference to `smp_bootstrap'

due to the kernel entry macro always including SMP startup code.
Wrap this code in CONFIG_SMP to fix the error.

Signed-off-by: Matt Redfearn <matt.redfearn@...tec.com>

---

 arch/mips/include/asm/mach-paravirt/kernel-entry-init.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
index 2f82bfa3a773..c9f5769dfc8f 100644
--- a/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
+++ b/arch/mips/include/asm/mach-paravirt/kernel-entry-init.h
@@ -11,11 +11,13 @@
 #define CP0_EBASE $15, 1
 
 	.macro  kernel_entry_setup
+#ifdef CONFIG_SMP
 	mfc0	t0, CP0_EBASE
 	andi	t0, t0, 0x3ff		# CPUNum
 	beqz	t0, 1f
 	# CPUs other than zero goto smp_bootstrap
 	j	smp_bootstrap
+#endif /* CONFIG_SMP */
 
 1:
 	.endm
-- 
2.7.4