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Tue, 22 Jul 2025 09:09:56 -0700 (PDT) Received: from localhost ([2a02:8308:a00c:e200:30d6:4986:8040:bb0a]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-458639ffca5sm19058775e9.1.2025.07.22.09.09.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Jul 2025 09:09:55 -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 Subject: [PATCH 3/3] riscv: pack rv64 thread_info better Date: Tue, 22 Jul 2025 18:05:57 +0200 Message-ID: <20250722160556.2216925-5-rkrcmar@ventanamicro.com> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250722160556.2216925-2-rkrcmar@ventanamicro.com> References: <20250722160556.2216925-2-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. Signed-off-by: Radim Kr=C4=8Dm=C3=A1=C5=99 Reviewed-by: Alexandre Ghiti Tested-by: Alexandre Ghiti --- 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