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From: Arnd Bergmann <arnd@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
	Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>,
	Marc Zyngier <maz@kernel.org>,
	linux-kernel@vger.kernel.org, David Brazdil <dbrazdil@google.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: vmlinux.lds.S: keep .entry.tramp.text section
Date: Fri, 26 Feb 2021 15:03:39 +0100	[thread overview]
Message-ID: <20210226140352.3477860-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

When building with CONFIG_LD_DEAD_CODE_DATA_ELIMINATION,
I sometimes see an assertion

 ld.lld: error: Entry trampoline text too big

This happens when any reference to the trampoline is discarded at link
time. Marking the section as KEEP() avoids the assertion, but I have
not figured out whether this is the correct solution for the underlying
problem.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm64/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 926cdb597a45..c5ee9d5842db 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -96,7 +96,7 @@ jiffies = jiffies_64;
 #define TRAMP_TEXT					\
 	. = ALIGN(PAGE_SIZE);				\
 	__entry_tramp_text_start = .;			\
-	*(.entry.tramp.text)				\
+	KEEP(*(.entry.tramp.text))			\
 	. = ALIGN(PAGE_SIZE);				\
 	__entry_tramp_text_end = .;
 #else
-- 
2.29.2


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WARNING: multiple messages have this Message-ID (diff)
From: Arnd Bergmann <arnd@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>, Ard Biesheuvel <ardb@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	David Brazdil <dbrazdil@google.com>,
	Kees Cook <keescook@chromium.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] arm64: vmlinux.lds.S: keep .entry.tramp.text section
Date: Fri, 26 Feb 2021 15:03:39 +0100	[thread overview]
Message-ID: <20210226140352.3477860-1-arnd@kernel.org> (raw)

From: Arnd Bergmann <arnd@arndb.de>

When building with CONFIG_LD_DEAD_CODE_DATA_ELIMINATION,
I sometimes see an assertion

 ld.lld: error: Entry trampoline text too big

This happens when any reference to the trampoline is discarded at link
time. Marking the section as KEEP() avoids the assertion, but I have
not figured out whether this is the correct solution for the underlying
problem.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/arm64/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 926cdb597a45..c5ee9d5842db 100644
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -96,7 +96,7 @@ jiffies = jiffies_64;
 #define TRAMP_TEXT					\
 	. = ALIGN(PAGE_SIZE);				\
 	__entry_tramp_text_start = .;			\
-	*(.entry.tramp.text)				\
+	KEEP(*(.entry.tramp.text))			\
 	. = ALIGN(PAGE_SIZE);				\
 	__entry_tramp_text_end = .;
 #else
-- 
2.29.2


             reply	other threads:[~2021-02-26 14:06 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-26 14:03 Arnd Bergmann [this message]
2021-02-26 14:03 ` [PATCH] arm64: vmlinux.lds.S: keep .entry.tramp.text section Arnd Bergmann
2021-02-26 20:59 ` Kees Cook
2021-02-26 20:59   ` Kees Cook
2021-02-27  4:32   ` Fangrui Song
2021-02-27  4:32     ` Fangrui Song
2021-03-16 10:45     ` Catalin Marinas
2021-03-16 10:45       ` Catalin Marinas
2021-03-16 16:27       ` Catalin Marinas
2021-03-16 16:27         ` Catalin Marinas
2021-03-16 16:39         ` Arnd Bergmann
2021-03-16 16:39           ` Arnd Bergmann
2021-03-16 19:09           ` Catalin Marinas
2021-03-16 19:09             ` Catalin Marinas
2021-06-02 19:32             ` Kees Cook
2021-06-02 19:32               ` Kees Cook
2021-06-03 12:07               ` Catalin Marinas
2021-06-03 12:07                 ` Catalin Marinas

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