commit 573ebfa6601f ("powerpc: Increase stack redzone for 64-bit
userspace to 512 bytes") only changes stack userspace redzone size.
We need increase the kernel one to 512 bytes too per ABIv2 spec.Signed-off-by: Bin Meng <bmeng...@gmail.com> --- arch/powerpc/include/asm/ptrace.h | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h index 447cbd1..817be3f 100644 --- a/arch/powerpc/include/asm/ptrace.h +++ b/arch/powerpc/include/asm/ptrace.h @@ -30,16 +30,12 @@ #ifdef __powerpc64__ /* - * Size of redzone that userspace is allowed to use below the stack + * Size of redzone that kernel/userspace is allowed to use below the stack * pointer. This is 288 in the 64-bit big-endian ELF ABI, and 512 in * the new ELFv2 little-endian ABI, so we allow the larger amount. - * - * For kernel code we allow a 288-byte redzone, in order to conserve - * kernel stack space; gcc currently only uses 288 bytes, and will - * hopefully allow explicit control of the redzone size in future. */ #define USER_REDZONE_SIZE 512 -#define KERNEL_REDZONE_SIZE 288 +#define KERNEL_REDZONE_SIZE 512 #define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */ #define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */ -- 2.7.4
