linux-kernel - [PATCH v2 1/3] RISC-V: pi: Force hidden visibility for all symbol references

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Message-ID: <20240626171652.366415-1-jesse@rivosinc.com>
Date: Wed, 26 Jun 2024 13:16:50 -0400
From: Jesse Taube <jesse@...osinc.com>
To: linux-riscv@...ts.infradead.org
Cc: Ard Biesheuvel <ardb@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	Jesse Taube <jesse@...osinc.com>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Wende Tan <twd2.me@...il.com>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Baoquan He <bhe@...hat.com>,
	Chen Jiahao <chenjiahao16@...wei.com>,
	"Mike Rapoport (IBM)" <rppt@...nel.org>,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH v2 1/3] RISC-V: pi: Force hidden visibility for all symbol references

Eliminate all GOT entries in the .pi section, by forcing hidden
visibility for all symbol references, which informs the compiler that
such references will be resolved at link time without the need for
allocating GOT entries.

Include linux/hidden.h in Makefile, like arm64, for the
hidden visibility attribute.

Signed-off-by: Jesse Taube <jesse@...osinc.com>
---
 arch/riscv/kernel/pi/Makefile | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/riscv/kernel/pi/Makefile b/arch/riscv/kernel/pi/Makefile
index 50bc5ef7dd2f..1ef7584be0c3 100644
--- a/arch/riscv/kernel/pi/Makefile
+++ b/arch/riscv/kernel/pi/Makefile
@@ -5,6 +5,7 @@ KBUILD_CFLAGS	:= $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) -fpie \
 		   -Os -DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN) \
 		   $(call cc-option,-mbranch-protection=none) \
 		   -I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \
+		   -include $(srctree)/include/linux/hidden.h \
 		   -D__DISABLE_EXPORTS -ffreestanding \
 		   -fno-asynchronous-unwind-tables -fno-unwind-tables \
 		   $(call cc-option,-fno-addrsig)
-- 
2.45.2