[PATCH v4 11/16] powerpc/kconfig: define CONFIG_DATA_SHIFT and CONFIG_ETEXT_SHIFT
From: Christophe Leroy <hidden>
Date: 2019-02-21 08:05:13
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
CONFIG_STRICT_KERNEL_RWX requires a special alignment for DATA for some subarches. Today it is just defined as an #ifdef in vmlinux.lds.S In order to get more flexibility, this patch moves the definition of this alignment in Kconfig On some subarches, CONFIG_STRICT_KERNEL_RWX will require a special alignment of _etext. This patch also adds a configuration item for it in Kconfig Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/Kconfig | 9 +++++++++ arch/powerpc/kernel/vmlinux.lds.S | 9 +++------ 2 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 01ac44d5d4b4..79a50276437c 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig@@ -728,6 +728,15 @@ config THREAD_SHIFT Used to define the stack size. The default is almost always what you want. Only change this if you know what you are doing. +config ETEXT_SHIFT + int + default PPC_PAGE_SHIFT + +config DATA_SHIFT + int + default 24 if STRICT_KERNEL_RWX && PPC64 + default PPC_PAGE_SHIFT + config FORCE_MAX_ZONEORDER int "Maximum zone order" range 8 9 if PPC64 && PPC_64K_PAGES
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S
index c3efb972c8c1..060a1acd7c6d 100644
--- a/arch/powerpc/kernel/vmlinux.lds.S
+++ b/arch/powerpc/kernel/vmlinux.lds.S@@ -12,11 +12,8 @@ #include <asm/cache.h> #include <asm/thread_info.h> -#if defined(CONFIG_STRICT_KERNEL_RWX) && !defined(CONFIG_PPC32) -#define STRICT_ALIGN_SIZE (1 << 24) -#else -#define STRICT_ALIGN_SIZE PAGE_SIZE -#endif +#define STRICT_ALIGN_SIZE (1 << CONFIG_DATA_SHIFT) +#define ETEXT_ALIGN_SIZE (1 << CONFIG_ETEXT_SHIFT) ENTRY(_stext)
@@ -131,7 +128,7 @@ SECTIONS } :kernel - . = ALIGN(PAGE_SIZE); + . = ALIGN(ETEXT_ALIGN_SIZE); _etext = .; PROVIDE32 (etext = .);
--
2.13.3