33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
From 720279fc141100893ba6da6ab18e52776ecf7424 Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Tue, 2 Mar 2021 13:38:18 +0900
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Subject: [PATCH 3/6] x86_64: fix "bt" command on 5.12-rc1 and later kernels
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Fix "bt" command on Linux 5.12-rc1 and later kernels that contain
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commit 951c2a51ae75 ("x86/irq/64: Adjust the per CPU irq stack pointer
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by 8"). Without the patch, the "bt" command and some of its options
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that read irq stack fail with the error message "bt: read of stack at
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<address> failed".
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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---
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x86_64.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/x86_64.c b/x86_64.c
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index 23a40a04bbc4..f5b2f7b5f040 100644
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--- a/x86_64.c
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+++ b/x86_64.c
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@@ -1326,6 +1326,8 @@ x86_64_per_cpu_init(void)
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KVADDR, &hardirq_stack_ptr, sizeof(void *),
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"hardirq_stack_ptr (per_cpu)", QUIET|RETURN_ON_ERROR))
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continue;
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+ if (hardirq_stack_ptr != PAGEBASE(hardirq_stack_ptr))
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+ hardirq_stack_ptr += 8;
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ms->stkinfo.ibase[i] = hardirq_stack_ptr - ms->stkinfo.isize;
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} else if (irq_sp)
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ms->stkinfo.ibase[i] = irq_sp->value + kt->__per_cpu_offset[i];
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--
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2.29.2
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