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Fri, 25 Jul 2025 09:57:04 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:8c15:2281:5347:b367]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3b778f1e87dsm361748f8f.72.2025.07.25.09.57.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jul 2025 09:57:03 -0700 (PDT) From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= To: linux-riscv@lists.infradead.org Cc: linux-kernel@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Deepak Gupta , Alexandre Ghiti Subject: [PATCH v2 4/4] riscv: pack rv64 thread_info better Date: Fri, 25 Jul 2025 18:54:12 +0200 Message-ID: <20250725165410.2896641-7-rkrcmar@ventanamicro.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250725165410.2896641-3-rkrcmar@ventanamicro.com> References: <20250725165410.2896641-3-rkrcmar@ventanamicro.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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 Reviewed-by: Alexandre Ghiti Signed-off-by: Radim Kr=C4=8Dm=C3=A1=C5=99 --- 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=3D>preemptible, <0=3D>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; --=20 2.50.0