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From: Nathan Chancellor <nathan@kernel.org>
To: Brian Cain <bcain@codeaurora.org>,
	Andrew Morton <akpm@linux-foundation.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	Nathan Chancellor <nathan@kernel.org>
Subject: [PATCH 1/3] hexagon: Handle {,SOFT}IRQENTRY_TEXT in linker script
Date: Thu, 20 May 2021 18:12:37 -0700
Message-ID: <20210521011239.1332345-2-nathan@kernel.org> (raw)
In-Reply-To: <20210521011239.1332345-1-nathan@kernel.org>

Patch "mm/slub: use stackdepot to save stack trace in objects" in -mm
selects CONFIG_STACKDEPOT when CONFIG_STACKTRACE_SUPPORT is selected and
CONFIG_STACKDEPOT requires IRQENTRY_TEXT and SOFTIRQENTRY_TEXT to be
handled after commit 505a0ef15f96 ("kasan: stackdepot: move
filter_irq_stacks() to stackdepot.c") due to the use of the
__{,soft}irqentry_text_{start,end} section symbols. If those sections
are not handled, the build is broken.

$ make ARCH=hexagon CROSS_COMPILE=hexagon-linux- LLVM=1 LLVM_IAS=1 defconfig all
...
ld.lld: error: undefined symbol: __irqentry_text_start
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a

ld.lld: error: undefined symbol: __irqentry_text_end
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a

ld.lld: error: undefined symbol: __softirqentry_text_start
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a

ld.lld: error: undefined symbol: __softirqentry_text_end
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a
>>> referenced by stackdepot.c
>>>               stackdepot.o:(filter_irq_stacks) in archive lib/built-in.a
...

Add these sections to the Hexagon linker script so the build continues
to work. ld.lld's orphan section warning would have caught this prior to
the -mm commit mentioned above:

ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text'
ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text'
ld.lld: warning: kernel/built-in.a(softirq.o):(.softirqentry.text) is being placed in '.softirqentry.text'

Fixes: 505a0ef15f96 ("kasan: stackdepot: move filter_irq_stacks() to stackdepot.c")
Link: https://github.com/ClangBuiltLinux/linux/issues/1381
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
 arch/hexagon/kernel/vmlinux.lds.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/hexagon/kernel/vmlinux.lds.S b/arch/hexagon/kernel/vmlinux.lds.S
index 35b18e55eae8..20f19539c5fc 100644
--- a/arch/hexagon/kernel/vmlinux.lds.S
+++ b/arch/hexagon/kernel/vmlinux.lds.S
@@ -38,6 +38,8 @@ SECTIONS
 	.text : AT(ADDR(.text)) {
 		_text = .;
 		TEXT_TEXT
+		IRQENTRY_TEXT
+		SOFTIRQENTRY_TEXT
 		SCHED_TEXT
 		CPUIDLE_TEXT
 		LOCK_TEXT
-- 
2.32.0.rc0


  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-21  1:12 [PATCH 0/3] hexagon: Fix build error with CONFIG_STACKDEPOT and select CONFIG_ARCH_WANT_LD_ORPHAN_WARN Nathan Chancellor
2021-05-21  1:12 ` Nathan Chancellor [this message]
2021-06-01 19:16   ` [PATCH 1/3] hexagon: Handle {,SOFT}IRQENTRY_TEXT in linker script Nick Desaulniers
2021-06-03 16:59   ` Brian Cain
2021-05-21  1:12 ` [PATCH 2/3] hexagon: Use common DISCARDS macro Nathan Chancellor
2021-06-01 19:18   ` Nick Desaulniers
2021-06-03 16:59   ` Brian Cain
2021-05-21  1:12 ` [PATCH 3/3] hexagon: Select ARCH_WANT_LD_ORPHAN_WARN Nathan Chancellor
2021-06-01 19:20   ` Nick Desaulniers
2021-06-03 16:59   ` Brian Cain
2021-06-03  1:17 ` [PATCH 0/3] hexagon: Fix build error with CONFIG_STACKDEPOT and select CONFIG_ARCH_WANT_LD_ORPHAN_WARN Nathan Chancellor
2021-06-03 16:59   ` Brian Cain
2021-06-15 17:25     ` Nathan Chancellor

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