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| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2019-02-21 20:08:47 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-23 11:04:32 +0100 |
| commit | 166d97d961588d2e52037e96da18d2ead455cec1 (patch) | |
| tree | 2f26ec12a85caaf3a869dba0f680a3b04a26d720 /arch | |
| parent | powerpc/kconfig: define PAGE_SHIFT inside Kconfig (diff) | |
| download | linux-166d97d961588d2e52037e96da18d2ead455cec1.tar.xz linux-166d97d961588d2e52037e96da18d2ead455cec1.zip | |
powerpc/kconfig: define CONFIG_DATA_SHIFT and CONFIG_ETEXT_SHIFT
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 <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/Kconfig | 9 | ||||
| -rw-r--r-- | 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 0f933797c376..14223363a33d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -721,6 +721,15 @@ 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 = .); |