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From: Paul Cercueil <paul@crapouillou.net>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>
Cc: list@opendingux.net, linux-mips@vger.kernel.org,
	linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
	Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH 3/3] MIPS: Add support for LTO
Date: Mon, 13 Dec 2021 22:49:14 +0000	[thread overview]
Message-ID: <20211213224914.1501303-4-paul@crapouillou.net> (raw)
In-Reply-To: <20211213224914.1501303-1-paul@crapouillou.net>

Allow CONFIG_LTO_CLANG to be enabled. The ThinLTO variant is not yet
supported.

While this option allows to build a LTO'd kernel, the result kernel file
ends up being *bigger* than the non-LTO variant (about 3.6 MiB with LTO
vs. 3.1 MiB without with a ZSTD-compressed kernel).

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 0215dc1529e9..6987db8d5f64 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -22,6 +22,7 @@ config MIPS
 	select ARCH_USE_QUEUED_RWLOCKS
 	select ARCH_USE_QUEUED_SPINLOCKS
 	select ARCH_SUPPORTS_HUGETLBFS if CPU_SUPPORTS_HUGEPAGES
+	select ARCH_SUPPORTS_LTO_CLANG if CPU_LITTLE_ENDIAN
 	select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_WANT_LD_ORPHAN_WARN
-- 
2.33.0


  parent reply	other threads:[~2021-12-13 22:49 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-13 22:49 [PATCH 0/3] MIPS: Add support for LTO Paul Cercueil
2021-12-13 22:49 ` [PATCH 1/3] MIPS: boot/compressed: Disable abicalls Paul Cercueil
2021-12-14 18:06   ` Nathan Chancellor
2021-12-14 19:09     ` Paul Cercueil
2021-12-14 19:38       ` Nick Desaulniers
2021-12-13 22:49 ` [PATCH 2/3] MIPS: boot/compressed: Build without LTO Paul Cercueil
2021-12-14 18:07   ` Nathan Chancellor
2021-12-14 19:43   ` Nick Desaulniers
2021-12-13 22:49 ` Paul Cercueil [this message]
2021-12-14 18:09   ` [PATCH 3/3] MIPS: Add support for LTO Nathan Chancellor
2021-12-14 19:45   ` Nick Desaulniers
2021-12-14 18:11 ` [PATCH 0/3] " Nathan Chancellor
2021-12-14 19:34 ` Nick Desaulniers

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