linux-kernel - [PATCH 3/3] MIPS: Add support for LTO

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Message-Id: <20211213224914.1501303-4-paul@crapouillou.net>
Date:   Mon, 13 Dec 2021 22:49:14 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     list@...ndingux.net, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH 3/3] MIPS: Add support for LTO

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@...pouillou.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