linux-kernel - [PATCH 09/10] arm64: select DYNAMIC_DEBUG_RELATIVE

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Message-Id: <20190409212517.7321-10-linux@rasmusvillemoes.dk>
Date:   Tue,  9 Apr 2019 23:25:16 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org
Cc:     Jason Baron <jbaron@...mai.com>, linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Will Deacon <will.deacon@....com>
Subject: [PATCH 09/10] arm64: select DYNAMIC_DEBUG_RELATIVE_POINTERS

Similar to GENERIC_BUG_RELATIVE_POINTERS, one can now relativize the
four const char* members of struct _ddebug, thus saving 16 bytes per
instance (one for each pr_debug(), dev_debug() etc. in a
CONFIG_DYNAMIC_DEBUG kernel). The asm-generic implementation seems to
work out-of-the-box, though this is only compile-tested.

Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
---
 arch/arm64/Kconfig            | 1 +
 arch/arm64/include/asm/Kbuild | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 7e34b9eba5de..d0871d523d5d 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -83,6 +83,7 @@ config ARM64
 	select CRC32
 	select DCACHE_WORD_ACCESS
 	select DMA_DIRECT_REMAP
+	select DYNAMIC_DEBUG_RELATIVE_POINTERS
 	select EDAC_SUPPORT
 	select FRAME_POINTER
 	select GENERIC_ALLOCATOR
diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
index 1e17ea5c372b..1ead0d645686 100644
--- a/arch/arm64/include/asm/Kbuild
+++ b/arch/arm64/include/asm/Kbuild
@@ -3,6 +3,7 @@ generic-y += delay.h
 generic-y += div64.h
 generic-y += dma.h
 generic-y += dma-contiguous.h
+generic-y += dynamic_debug.h
 generic-y += early_ioremap.h
 generic-y += emergency-restart.h
 generic-y += hw_irq.h
-- 
2.20.1