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[RFC,3/3] arm64: Reduce kernel stack size when using IRQ stack

Message ID 1441376587-12979-4-git-send-email-jungseoklee85@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jungseok Lee Sept. 4, 2015, 2:23 p.m. UTC
It is a principal objective of IRQ stack feature to reduce kernel
stack size. Therefore, the size is set to 8KB when a separate IRQ
stack is active.

Signed-off-by: Jungseok Lee <jungseoklee85@gmail.com>
---
 arch/arm64/include/asm/thread_info.h | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 5345a67..e79210d 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -24,10 +24,18 @@ 
 #include <linux/compiler.h>
 
 #ifndef CONFIG_ARM64_64K_PAGES
+#ifdef CONFIG_IRQ_STACK
+#define THREAD_SIZE_ORDER	1
+#else
 #define THREAD_SIZE_ORDER	2
 #endif
+#endif
 
+#ifdef CONFIG_IRQ_STACK
+#define THREAD_SIZE		8192
+#else
 #define THREAD_SIZE		16384
+#endif
 #define THREAD_START_SP		(THREAD_SIZE - 16)
 
 #ifndef __ASSEMBLY__