linux-kernel - [RFC PATCH] riscv: reduce THREAD

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Message-Id: <20220206174359.2986-1-jszhang@kernel.org>
Date:   Mon,  7 Feb 2022 01:43:59 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH] riscv: reduce THREAD_SIZE from 16KB to 8KB for RV64

After irq stack is supported, it's possible to use small THREAD_SIZE.
In fact, I tested this patch on a Lichee RV board, looks good so far.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
---
 arch/riscv/include/asm/thread_info.h | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
index 67387a8bcb34..fdbf3890a1ab 100644
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -12,11 +12,7 @@
 #include <linux/const.h>
 
 /* thread information allocation */
-#ifdef CONFIG_64BIT
-#define THREAD_SIZE_ORDER	(2)
-#else
 #define THREAD_SIZE_ORDER	(1)
-#endif
 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
 
 #define IRQ_STACK_SIZE		THREAD_SIZE
-- 
2.34.1