linux-kernel - [PATCH v3] riscv: make sure the cores stay looping in .Lsecondary

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Message-Id: <20200109031516.29639-1-greentime.hu@sifive.com>
Date:   Thu,  9 Jan 2020 11:15:16 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     green.hu@...il.com, greentime@...nel.org, paul.walmsley@...ive.com,
        palmer@...belt.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, schwab@...e.de, anup@...infault.org
Cc:     Greentime Hu <greentime.hu@...ive.com>
Subject: [PATCH v3] riscv: make sure the cores stay looping in .Lsecondary_park

The code in secondary_park is currently placed in the .init section.  The
kernel reclaims and clears this code when it finishes booting.  That
causes the cores parked in it to go to somewhere unpredictable, so we
move this function out of init to make sure the cores stay looping there.

Signed-off-by: Greentime Hu <greentime.hu@...ive.com>
Reviewed-by: Anup Patel <anup@...infault.org>
---
 arch/riscv/kernel/head.S | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S
index f8f996916c5b..276b98f9d0bd 100644
--- a/arch/riscv/kernel/head.S
+++ b/arch/riscv/kernel/head.S
@@ -217,11 +217,6 @@ relocate:
 	tail smp_callin
 #endif
 
-.align 2
-.Lsecondary_park:
-	/* We lack SMP support or have too many harts, so park this hart */
-	wfi
-	j .Lsecondary_park
 END(_start)
 
 #ifdef CONFIG_RISCV_M_MODE
@@ -303,6 +298,13 @@ ENTRY(reset_regs)
 END(reset_regs)
 #endif /* CONFIG_RISCV_M_MODE */
 
+.section ".text", "ax",@progbits
+.align 2
+.Lsecondary_park:
+	/* We lack SMP support or have too many harts, so park this hart */
+	wfi
+	j .Lsecondary_park
+
 __PAGE_ALIGNED_BSS
 	/* Empty zero page */
 	.balign PAGE_SIZE
-- 
2.17.1