From: Paul Burton <paul.burton@imgtec.com> To: <linux-mips@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org>, Nicholas Piggin <npiggin@gmail.com>, Paul Burton <paul.burton@imgtec.com> Subject: [PATCH 6/6] MIPS: Use thin archives & dead code elimination Date: Thu, 20 Oct 2016 21:27:05 +0100 [thread overview] Message-ID: <20161020202705.3783-7-paul.burton@imgtec.com> (raw) In-Reply-To: <20161020202705.3783-1-paul.burton@imgtec.com> Enable CONFIG_THIN_ARCHIVES & CONFIG_LD_DEAD_CODE_DATA_ELIMINATION for MIPS, ensuring that we keep the data bus exception table & the machine list which would be discarded without marking them with KEEP. This shrinks a typical generic kernel build with drivers enabled for Boston, Ci40 & SEAD-3 by around 5%, or ~450kb. As reported by bloat-o-meter: add/remove: 0/3028 grow/shrink: 1/14 up/down: 18/-457362 (-457344) ... Total: Before=9001030, After=8543686, chg -5.08% Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Nicholas Piggin <npiggin@gmail.com> --- arch/mips/Kconfig | 2 ++ arch/mips/kernel/vmlinux.lds.S | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index b3c5bde..8557667 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -66,6 +66,8 @@ config MIPS select HAVE_EXIT_THREAD select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_ARCH_HARDENED_USERCOPY + select THIN_ARCHIVES + select LD_DEAD_CODE_DATA_ELIMINATION menu "Machine selection" diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S index d1f5401..a43ba2a 100644 --- a/arch/mips/kernel/vmlinux.lds.S +++ b/arch/mips/kernel/vmlinux.lds.S @@ -72,7 +72,7 @@ SECTIONS /* Exception table for data bus errors */ __dbe_table : { __start___dbe_table = .; - *(__dbe_table) + KEEP(*(__dbe_table)) __stop___dbe_table = .; } @@ -122,7 +122,7 @@ SECTIONS . = ALIGN(4); .mips.machines.init : AT(ADDR(.mips.machines.init) - LOAD_OFFSET) { __mips_machines_start = .; - *(.mips.machines.init) + KEEP(*(.mips.machines.init)) __mips_machines_end = .; } -- 2.10.0
WARNING: multiple messages have this Message-ID (diff)
From: Paul Burton <paul.burton@imgtec.com> To: linux-mips@linux-mips.org Cc: Ralf Baechle <ralf@linux-mips.org>, Nicholas Piggin <npiggin@gmail.com>, Paul Burton <paul.burton@imgtec.com> Subject: [PATCH 6/6] MIPS: Use thin archives & dead code elimination Date: Thu, 20 Oct 2016 21:27:05 +0100 [thread overview] Message-ID: <20161020202705.3783-7-paul.burton@imgtec.com> (raw) Message-ID: <20161020202705.QaUVgwAGaymIsYrIsyCjJO7_fI0Qg5SkBef2qVgziT0@z> (raw) In-Reply-To: <20161020202705.3783-1-paul.burton@imgtec.com> Enable CONFIG_THIN_ARCHIVES & CONFIG_LD_DEAD_CODE_DATA_ELIMINATION for MIPS, ensuring that we keep the data bus exception table & the machine list which would be discarded without marking them with KEEP. This shrinks a typical generic kernel build with drivers enabled for Boston, Ci40 & SEAD-3 by around 5%, or ~450kb. As reported by bloat-o-meter: add/remove: 0/3028 grow/shrink: 1/14 up/down: 18/-457362 (-457344) ... Total: Before=9001030, After=8543686, chg -5.08% Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Nicholas Piggin <npiggin@gmail.com> --- arch/mips/Kconfig | 2 ++ arch/mips/kernel/vmlinux.lds.S | 4 ++-- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index b3c5bde..8557667 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -66,6 +66,8 @@ config MIPS select HAVE_EXIT_THREAD select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_ARCH_HARDENED_USERCOPY + select THIN_ARCHIVES + select LD_DEAD_CODE_DATA_ELIMINATION menu "Machine selection" diff --git a/arch/mips/kernel/vmlinux.lds.S b/arch/mips/kernel/vmlinux.lds.S index d1f5401..a43ba2a 100644 --- a/arch/mips/kernel/vmlinux.lds.S +++ b/arch/mips/kernel/vmlinux.lds.S @@ -72,7 +72,7 @@ SECTIONS /* Exception table for data bus errors */ __dbe_table : { __start___dbe_table = .; - *(__dbe_table) + KEEP(*(__dbe_table)) __stop___dbe_table = .; } @@ -122,7 +122,7 @@ SECTIONS . = ALIGN(4); .mips.machines.init : AT(ADDR(.mips.machines.init) - LOAD_OFFSET) { __mips_machines_start = .; - *(.mips.machines.init) + KEEP(*(.mips.machines.init)) __mips_machines_end = .; } -- 2.10.0
next prev parent reply other threads:[~2016-10-20 20:30 UTC|newest] Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-10-20 20:26 [PATCH 0/6] MIPS: Use thin archives & dead code elimination Paul Burton 2016-10-20 20:26 ` Paul Burton 2016-10-20 20:27 ` [PATCH 1/6] kbuild: Keep device tree tables though " Paul Burton 2016-10-20 20:27 ` Paul Burton 2016-10-21 9:33 ` Sergei Shtylyov 2016-10-20 20:27 ` [PATCH 2/6] kbuild: Keep .init.setup section through " Paul Burton 2016-10-20 20:27 ` Paul Burton 2016-10-20 20:27 ` [PATCH 3/6] kbuild: Keep PCI fixups " Paul Burton 2016-10-20 20:27 ` Paul Burton 2016-10-20 20:27 ` [PATCH 4/6] kbuild: Keep earlycon table " Paul Burton 2016-10-20 20:27 ` Paul Burton 2016-10-20 20:27 ` [PATCH 5/6] MIPS: Ensure bss section ends on a long-aligned address Paul Burton 2016-10-20 20:27 ` Paul Burton 2016-11-04 8:46 ` Marcin Nowakowski 2016-11-04 8:46 ` Marcin Nowakowski 2016-10-20 20:27 ` Paul Burton [this message] 2016-10-20 20:27 ` [PATCH 6/6] MIPS: Use thin archives & dead code elimination Paul Burton 2016-10-21 0:51 ` [PATCH 0/6] " Nicholas Piggin 2016-10-21 0:51 ` Nicholas Piggin 2016-10-21 7:45 ` Paul Burton 2016-10-21 7:45 ` Paul Burton 2016-10-21 8:47 ` Nicholas Piggin 2016-10-21 8:47 ` Nicholas Piggin
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