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From: "Radim Krčmář" <rkrcmar@ventanamicro.com>
To: linux-riscv@lists.infradead.org
Cc: linux-kernel@vger.kernel.org,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Deepak Gupta <debug@rivosinc.com>,
	Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v2 4/4] riscv: pack rv64 thread_info better
Date: Fri, 25 Jul 2025 18:54:12 +0200	[thread overview]
Message-ID: <20250725165410.2896641-7-rkrcmar@ventanamicro.com> (raw)
In-Reply-To: <20250725165410.2896641-3-rkrcmar@ventanamicro.com>

On rv64, preempt_count and cpu were both 32-bit followed by 64-bit, so
placing one in the hole saves 8 bytes in the struct.

Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
---
v2: tested and reviewed by Alex
---
 arch/riscv/include/asm/thread_info.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
index f5916a70879a..c267d6bd838e 100644
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -53,6 +53,7 @@
 struct thread_info {
 	unsigned long		flags;		/* low level flags */
 	int                     preempt_count;  /* 0=>preemptible, <0=>BUG */
+	int			cpu;
 	/*
 	 * These stack pointers are overwritten on every system call or
 	 * exception.  SP is also saved to the stack it can be recovered when
@@ -60,7 +61,6 @@ struct thread_info {
 	 */
 	long			kernel_sp;	/* Kernel stack pointer */
 	long			user_sp;	/* User stack pointer */
-	int			cpu;
 	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
 #ifdef CONFIG_SHADOW_CALL_STACK
 	void			*scs_base;
-- 
2.50.0


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WARNING: multiple messages have this Message-ID (diff)
From: "Radim Krčmář" <rkrcmar@ventanamicro.com>
To: linux-riscv@lists.infradead.org
Cc: linux-kernel@vger.kernel.org,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alex@ghiti.fr>,
	Deepak Gupta <debug@rivosinc.com>,
	Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: [PATCH v2 4/4] riscv: pack rv64 thread_info better
Date: Fri, 25 Jul 2025 18:54:12 +0200	[thread overview]
Message-ID: <20250725165410.2896641-7-rkrcmar@ventanamicro.com> (raw)
In-Reply-To: <20250725165410.2896641-3-rkrcmar@ventanamicro.com>

On rv64, preempt_count and cpu were both 32-bit followed by 64-bit, so
placing one in the hole saves 8 bytes in the struct.

Tested-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
---
v2: tested and reviewed by Alex
---
 arch/riscv/include/asm/thread_info.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
index f5916a70879a..c267d6bd838e 100644
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -53,6 +53,7 @@
 struct thread_info {
 	unsigned long		flags;		/* low level flags */
 	int                     preempt_count;  /* 0=>preemptible, <0=>BUG */
+	int			cpu;
 	/*
 	 * These stack pointers are overwritten on every system call or
 	 * exception.  SP is also saved to the stack it can be recovered when
@@ -60,7 +61,6 @@ struct thread_info {
 	 */
 	long			kernel_sp;	/* Kernel stack pointer */
 	long			user_sp;	/* User stack pointer */
-	int			cpu;
 	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
 #ifdef CONFIG_SHADOW_CALL_STACK
 	void			*scs_base;
-- 
2.50.0


  parent reply	other threads:[~2025-07-25 16:59 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-07-25 16:54 [PATCH v2 0/4] riscv: minor thread_info.cpu improvements Radim Krčmář
2025-07-25 16:54 ` Radim Krčmář
2025-07-25 16:54 ` [PATCH v2 1/4] riscv: use lw when reading int cpu in new_vmalloc_check Radim Krčmář
2025-07-25 16:54   ` Radim Krčmář
2025-07-25 16:54 ` [PATCH v2 2/4] riscv: use lw when reading int cpu in asm_per_cpu Radim Krčmář
2025-07-25 16:54   ` Radim Krčmář
2025-07-25 16:54 ` [PATCH v2 3/4] riscv: use TASK_TI_CPU instead of TASK_TI_CPU_NUM Radim Krčmář
2025-07-25 16:54   ` Radim Krčmář
2025-07-25 16:54 ` Radim Krčmář [this message]
2025-07-25 16:54   ` [PATCH v2 4/4] riscv: pack rv64 thread_info better Radim Krčmář
2025-07-31 13:22 ` [PATCH v2 0/4] riscv: minor thread_info.cpu improvements Alexandre Ghiti
2025-07-31 13:22   ` Alexandre Ghiti
2025-08-06 17:15 ` patchwork-bot+linux-riscv
2025-08-06 17:15   ` patchwork-bot+linux-riscv

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