linux-kernel - [PATCH 1/2] riscv: signal: fix signal frame size

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Message-Id: <20241210142353.6457-2-yongxuan.wang@sifive.com>
Date: Tue, 10 Dec 2024 22:23:49 +0800
From: Yong-Xuan Wang <yongxuan.wang@...ive.com>
To: linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org
Cc: greentime.hu@...ive.com,
	vincent.chen@...ive.com,
	Yong-Xuan Wang <yongxuan.wang@...ive.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Andy Chiu <andybnac@...il.com>,
	Zong Li <zong.li@...ive.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Zhongqiu Han <quic_zhonhan@...cinc.com>,
	Björn Töpel <bjorn@...osinc.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Heiko Stuebner <heiko@...ech.de>
Subject: [PATCH 1/2] riscv: signal: fix signal frame size

The signal context of certain RISC-V extensions will be appended after
struct __riscv_extra_ext_header, which already includes an empty context
header. Therefore, there is no need to preserve a separate hdr for the
END of signal context.

Fixes: 8ee0b41898fa ("riscv: signal: Add sigcontext save/restore for vector")
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
Reviewed-by: Zong Li <zong.li@...ive.com>
---
 arch/riscv/kernel/signal.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index dcd282419456..c3c517b9eee5 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -215,12 +215,6 @@ static size_t get_rt_frame_size(bool cal_all)
 		if (cal_all || riscv_v_vstate_query(task_pt_regs(current)))
 			total_context_size += riscv_v_sc_size;
 	}
-	/*
-	 * Preserved a __riscv_ctx_hdr for END signal context header if an
-	 * extension uses __riscv_extra_ext_header
-	 */
-	if (total_context_size)
-		total_context_size += sizeof(struct __riscv_ctx_hdr);
 
 	frame_size += total_context_size;
 
-- 
2.17.1