linux-kernel - [PATCH v4 2/4] ARM: Define KERNEL_START and KERNEL

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Date:   Mon, 26 Dec 2016 12:38:40 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Florian Fainelli <f.fainelli@...il.com>, linux@...linux.org.uk,
        nicolas.pitre@...aro.org, panand@...hat.com,
        chris.brandt@...esas.com, arnd@...db.de, jonathan.austin@....com,
        pawel.moll@....com, vladimir.murzin@....com, mark.rutland@....com,
        ard.biesheuvel@...aro.org, keescook@...omium.org,
        matt@...eblueprint.co.uk, labbott@...oraproject.org,
        kirill.shutemov@...ux.intel.com, ben@...adent.org.uk,
        js07.lee@...sung.com, stefan@...er.ch,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        cyrille.pitchen@...el.com, richard@....at,
        boris.brezillon@...e-electrons.com, computersforpeace@...il.com,
        dwmw2@...radead.org
Subject: [PATCH v4 2/4] ARM: Define KERNEL_START and KERNEL_END

In preparation for adding CONFIG_DEBUG_VIRTUAL support, define a set of
common constants: KERNEL_START and KERNEL_END which abstract
CONFIG_XIP_KERNEL vs. !CONFIG_XIP_KERNEL. Update the code where
relevant.

Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
 arch/arm/include/asm/memory.h | 7 +++++++
 arch/arm/mm/init.c            | 7 ++-----
 arch/arm/mm/mmu.c             | 6 +-----
 3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 76cbd9c674df..bee7511c5098 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -111,6 +111,13 @@
 
 #endif /* !CONFIG_MMU */
 
+#ifdef CONFIG_XIP_KERNEL
+#define KERNEL_START		_sdata
+#else
+#define KERNEL_START		_stext
+#endif
+#define KERNEL_END		_end
+
 /*
  * We fix the TCM memories max 32 KiB ITCM resp DTCM at these
  * locations
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 370581aeb871..c87d0d5b65f2 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -230,11 +230,8 @@ phys_addr_t __init arm_memblock_steal(phys_addr_t size, phys_addr_t align)
 void __init arm_memblock_init(const struct machine_desc *mdesc)
 {
 	/* Register the kernel text, kernel data and initrd with memblock. */
-#ifdef CONFIG_XIP_KERNEL
-	memblock_reserve(__pa(_sdata), _end - _sdata);
-#else
-	memblock_reserve(__pa(_stext), _end - _stext);
-#endif
+	memblock_reserve(__pa(KERNEL_START), _end - KERNEL_START);
+
 #ifdef CONFIG_BLK_DEV_INITRD
 	/* FDT scan will populate initrd_start */
 	if (initrd_start && !phys_initrd_size) {
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 4001dd15818d..f0fd1a2db036 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1437,11 +1437,7 @@ static void __init kmap_init(void)
 static void __init map_lowmem(void)
 {
 	struct memblock_region *reg;
-#ifdef CONFIG_XIP_KERNEL
-	phys_addr_t kernel_x_start = round_down(__pa(_sdata), SECTION_SIZE);
-#else
-	phys_addr_t kernel_x_start = round_down(__pa(_stext), SECTION_SIZE);
-#endif
+	phys_addr_t kernel_x_start = round_down(__pa(KERNEL_START), SECTION_SIZE);
 	phys_addr_t kernel_x_end = round_up(__pa(__init_end), SECTION_SIZE);
 
 	/* Map all the lowmem memory banks. */
-- 
2.9.3