From: Jungseok Lee <jungseoklee85@gmail.com>
Date: Tue, 2 Dec 2014 17:49:24 +0000 (+0000)
Subject: arm64: Implement support for read-mostly sections
X-Git-Tag: Ubuntu-5.10.0-12.13~15787^2~6
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=e4f88d833bec29b8e6fadc1b2488f0c6370935e1;p=mirror_ubuntu-hirsute-kernel.git

arm64: Implement support for read-mostly sections

As putting data which is read mostly together, we can avoid
unnecessary cache line bouncing.

Other architectures, such as ARM and x86, adopted the same idea.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
index 88cc05b5f3ac..bde449936e2f 100644
--- a/arch/arm64/include/asm/cache.h
+++ b/arch/arm64/include/asm/cache.h
@@ -32,6 +32,8 @@
 
 #ifndef __ASSEMBLY__
 
+#define __read_mostly __attribute__((__section__(".data..read_mostly")))
+
 static inline int cache_line_size(void)
 {
 	u32 cwg = cache_type_cwg();