From: Nicholas Piggin <npiggin@gmail.com>
To: linux-kbuild@vger.kernel.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
linux-arch@vger.kernel.org, Michal Marek <mmarek@suse.com>,
Sam Ravnborg <sam@ravnborg.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Arnd Bergmann <arnd@arndb.de>, Nicolas Pitre <nico@linaro.org>,
Segher Boessenkool <segher@kernel.crashing.org>,
Alan Modra <amodra@gmail.com>
Subject: [PATCH 5/6] powerpc/64: use linker dead code elimination
Date: Thu, 11 Aug 2016 20:16:19 +1000 [thread overview]
Message-ID: <1470910580-18458-6-git-send-email-npiggin@gmail.com> (raw)
In-Reply-To: <1470910580-18458-1-git-send-email-npiggin@gmail.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/Makefile | 3 +++
arch/powerpc/kernel/vmlinux.lds.S | 2 +-
arch/powerpc/platforms/Kconfig.cputype | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index b2027a5..974a068 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -4,7 +4,10 @@
CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"'
+ccflags-y += -fno-function-sections -fno-data-sections
+
subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
+subdir-ccflags-y += -fno-function-sections -fno-data-sections
ifeq ($(CONFIG_PPC64),y)
CFLAGS_prom_init.o += $(NO_MINIMAL_TOC)
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index b5fba68..baad2af 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S
@@ -50,7 +50,7 @@ SECTIONS
HEAD_TEXT
_text = .;
/* careful! __ftr_alt_* sections need to be close to .text */
- *(.text .fixup __ftr_alt_* .ref.text)
+ *(.text .text.* .fixup __ftr_alt_* .ref.text)
SCHED_TEXT
LOCK_TEXT
KPROBES_TEXT
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index b5fc6cb..59c9097 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -2,6 +2,7 @@ config PPC64
bool "64-bit kernel"
default n
select THIN_ARCHIVES
+ select LD_DEAD_CODE_DATA_ELIMINATION
select ZLIB_DEFLATE
help
This option selects whether a 32-bit or a 64-bit kernel
--
2.8.1
next prev parent reply other threads:[~2016-08-11 10:17 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-11 10:16 [PATCH 0/6 v2] kbuild changes, thin archives, --gc-sections Nicholas Piggin
2016-08-11 10:16 ` Nicholas Piggin
2016-08-11 10:16 ` [PATCH 1/6] kbuild: allow architectures to use thin archives instead of ld -r Nicholas Piggin
2016-08-11 10:16 ` Nicholas Piggin
2016-08-11 10:16 ` [PATCH 2/6] kbuild: allow archs to select link dead code/data elimination Nicholas Piggin
2016-08-11 10:16 ` Nicholas Piggin
2016-08-11 10:16 ` [PATCH 3/6] kbuild: add arch specific post-link pass Nicholas Piggin
2016-08-16 9:23 ` Michal Marek
2016-08-17 4:43 ` Nicholas Piggin
2016-08-17 4:43 ` Nicholas Piggin
2016-08-17 9:05 ` Michal Marek
2016-08-17 9:56 ` Sam Ravnborg
2016-08-17 9:56 ` Sam Ravnborg
2016-08-18 0:17 ` Nicholas Piggin
2016-08-11 10:16 ` [PATCH 4/6] powerpc: switch to using thin archives Nicholas Piggin
2016-08-11 10:16 ` Nicholas Piggin [this message]
2016-08-11 10:16 ` [PATCH 6/6] powerpc: use the new post-link pass to check relocations Nicholas Piggin
2016-08-11 10:16 ` Nicholas Piggin
2016-08-11 12:31 ` [PATCH 0/6 v2] kbuild changes, thin archives, --gc-sections Stephen Rothwell
2016-08-11 12:31 ` Stephen Rothwell
2016-08-11 12:39 ` [PATCH] Xen: remove -fshort-wchar gcc flag Arnd Bergmann
2016-08-11 12:39 ` Arnd Bergmann
2016-08-11 12:51 ` [Xen-devel] " Jan Beulich
2016-08-11 12:51 ` Jan Beulich
2016-08-11 14:01 ` Arnd Bergmann
2016-08-11 14:06 ` Jan Beulich
2016-08-11 14:06 ` Jan Beulich
2016-08-24 17:18 ` David Vrabel
2016-08-11 13:55 ` [EXPERIMENTAL] enable thin archives and --gc-sections on ARM Arnd Bergmann
2016-08-11 13:55 ` Arnd Bergmann
2016-08-11 20:01 ` Nicolas Pitre
2016-08-11 20:01 ` Nicolas Pitre
2016-08-11 20:37 ` Arnd Bergmann
2016-08-11 20:37 ` Arnd Bergmann
2016-08-11 21:05 ` Nicolas Pitre
2016-08-23 6:17 ` [PATCH 0/6 v2] kbuild changes, thin archives, --gc-sections Nicholas Piggin
2016-08-23 6:17 ` Nicholas Piggin
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