From: Fangrui Song <maskray@google.com>
To: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
linux-riscv@lists.infradead.org
Cc: Nathan Chancellor <nathan@kernel.org>,
linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
Fangrui Song <maskray@google.com>
Subject: [PATCH v2] riscv module: remove (NOLOAD)
Date: Mon, 21 Mar 2022 18:26:17 -0700 [thread overview]
Message-ID: <20220322012617.3517297-1-maskray@google.com> (raw)
In-Reply-To: <mhng-7fe2c5d9-a8e6-4123-ac5c-0c9190792520@palmer-ri-x1c9>
On ELF, (NOLOAD) sets the section type to SHT_NOBITS[1]. It is conceptually
inappropriate for .plt, .got, and .got.plt sections which are always
SHT_PROGBITS.
In GNU ld, if PLT entries are needed, .plt will be SHT_PROGBITS anyway
and (NOLOAD) will be essentially ignored. In ld.lld, since
https://reviews.llvm.org/D118840 ("[ELF] Support (TYPE=<value>) to
customize the output section type"), ld.lld will report a `section type
mismatch` error (later changed to a warning). Just remove (NOLOAD) to
fix the warning.
[1] https://lld.llvm.org/ELF/linker_script.html As of today, "The
section should be marked as not loadable" on
https://sourceware.org/binutils/docs/ld/Output-Section-Type.html is
outdated for ELF.
Link: https://github.com/ClangBuiltLinux/linux/issues/1597
Fixes: ab1ef68e5401 ("RISC-V: Add sections of PLT and GOT for kernel module")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Fangrui Song <maskray@google.com>
---
arch/riscv/include/asm/module.lds.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/include/asm/module.lds.h b/arch/riscv/include/asm/module.lds.h
index 4254ff2ff049..1075beae1ac6 100644
--- a/arch/riscv/include/asm/module.lds.h
+++ b/arch/riscv/include/asm/module.lds.h
@@ -2,8 +2,8 @@
/* Copyright (C) 2017 Andes Technology Corporation */
#ifdef CONFIG_MODULE_SECTIONS
SECTIONS {
- .plt (NOLOAD) : { BYTE(0) }
- .got (NOLOAD) : { BYTE(0) }
- .got.plt (NOLOAD) : { BYTE(0) }
+ .plt : { BYTE(0) }
+ .got : { BYTE(0) }
+ .got.plt : { BYTE(0) }
}
#endif
--
2.35.1.894.gb6a874cedc-goog
next prev parent reply other threads:[~2022-03-22 1:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-18 8:26 [PATCH] riscv module: remove (NOLOAD) Fangrui Song
2022-02-19 16:45 ` Nathan Chancellor
2022-03-18 23:18 ` Palmer Dabbelt
2022-03-22 1:26 ` Fangrui Song [this message]
2022-03-22 1:49 ` [PATCH v2] " Nathan Chancellor
2022-03-30 0:21 ` Palmer Dabbelt
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