diff options
| author | Andrey Ryabinin <a.ryabinin@samsung.com> | 2014-06-18 17:12:40 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-07-01 16:05:47 +0200 |
| commit | 9a2b51b6ca93fc42e5676aa444c956f7506185db (patch) | |
| tree | 0014878f0c4844f467e25de7b45cbed1a73889a7 /arch/arm | |
| parent | ARM: simplify generation of compressed vmlinux.lds file (diff) | |
| download | linux-9a2b51b6ca93fc42e5676aa444c956f7506185db.tar.xz linux-9a2b51b6ca93fc42e5676aa444c956f7506185db.zip | |
ARM: 8078/1: get rid of hardcoded assumptions about kernel stack size
Changing kernel stack size on arm is not as simple as it should be:
1) THREAD_SIZE macro doesn't respect PAGE_SIZE and THREAD_SIZE_ORDER
2) stack size is hardcoded in get_thread_info macro
This patch fixes it by calculating THREAD_SIZE and thread_info address
taking into account PAGE_SIZE and THREAD_SIZE_ORDER.
Now changing stack size becomes simply changing THREAD_SIZE_ORDER.
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 8 | ||||
| -rw-r--r-- | arch/arm/include/asm/thread_info.h | 3 |
2 files changed, 7 insertions, 4 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 57f0584e8d97..906703a5b564 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -24,6 +24,8 @@ #include <asm/domain.h> #include <asm/opcodes-virt.h> #include <asm/asm-offsets.h> +#include <asm/page.h> +#include <asm/thread_info.h> #define IOMEM(x) (x) @@ -179,10 +181,10 @@ * Get current thread_info. */ .macro get_thread_info, rd - ARM( mov \rd, sp, lsr #13 ) + ARM( mov \rd, sp, lsr #THREAD_SIZE_ORDER + PAGE_SHIFT ) THUMB( mov \rd, sp ) - THUMB( lsr \rd, \rd, #13 ) - mov \rd, \rd, lsl #13 + THUMB( lsr \rd, \rd, #THREAD_SIZE_ORDER + PAGE_SHIFT ) + mov \rd, \rd, lsl #THREAD_SIZE_ORDER + PAGE_SHIFT .endm /* diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h index e4e4208a9130..fc44d3761f9e 100644 --- a/arch/arm/include/asm/thread_info.h +++ b/arch/arm/include/asm/thread_info.h @@ -14,9 +14,10 @@ #include <linux/compiler.h> #include <asm/fpstate.h> +#include <asm/page.h> #define THREAD_SIZE_ORDER 1 -#define THREAD_SIZE 8192 +#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER) #define THREAD_START_SP (THREAD_SIZE - 8) #ifndef __ASSEMBLY__ |