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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next prev parent reply other threads:[~2025-07-25 16:59 UTC|newest]
Thread overview: 7+ 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 ` [PATCH v2 1/4] riscv: use lw when reading int cpu in new_vmalloc_check 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 ` [PATCH v2 3/4] riscv: use TASK_TI_CPU instead of TASK_TI_CPU_NUM Radim Krčmář
2025-07-25 16:54 ` Radim Krčmář [this message]
2025-07-31 13:22 ` [PATCH v2 0/4] riscv: minor thread_info.cpu improvements Alexandre Ghiti
2025-08-06 17:15 ` patchwork-bot+linux-riscv
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