arm64: Change kernel stack size to 16K

Written by Catalin Marinas, tested by APM on storm platform. This is needed
because of the failures encountered when running SpecWeb benchmark test.

Signed-off-by: Feng Kan <fkan@apm.com>
Acked-by: Kumar Sankaran <ksankaran@apm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 3659e46..23a3c47 100644 (file)
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -24,10 +24,10 @@
 #include <linux/compiler.h>
 
 #ifndef CONFIG_ARM64_64K_PAGES
-#define THREAD_SIZE_ORDER      1
+#define THREAD_SIZE_ORDER      2
 #endif
 
-#define THREAD_SIZE            8192
+#define THREAD_SIZE            16384
 #define THREAD_START_SP                (THREAD_SIZE - 16)
 
 #ifndef __ASSEMBLY__

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 1d13142..6ad781b 100644 (file)
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -121,7 +121,7 @@
 
        .macro  get_thread_info, rd
        mov     \rd, sp
-       and     \rd, \rd, #~((1 << 13) - 1)     // top of 8K stack
+       and     \rd, \rd, #~(THREAD_SIZE - 1)   // top of stack
        .endm
 
 /*