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From: guoren@kernel.org
To: linux-kernel@vger.kernel.org, paul.walmsley@sifive.com,
	palmer@dabbelt.com, alexghiti@rivosinc.com, charlie@rivosinc.com,
	xiao.w.wang@intel.com, guoren@kernel.org, david@redhat.com,
	panqinglin2020@iscas.ac.cn, rick.p.edgecombe@intel.com,
	willy@infradead.org, bjorn@rivosinc.com,
	conor.dooley@microchip.com, cleger@rivosinc.com,
	leobras@redhat.com
Cc: linux-riscv@lists.infradead.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V3 4/4] riscv: mm: Optimize TASK_SIZE definition
Date: Fri, 22 Dec 2023 06:57:03 -0500	[thread overview]
Message-ID: <20231222115703.2404036-5-guoren@kernel.org> (raw)
In-Reply-To: <20231222115703.2404036-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

Unify the TASK_SIZE definition with VA_BITS for better readability.
Add COMPAT mode user address space info in the comment.

Reviewed-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/include/asm/pgtable.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index e415582276ec..271565e1956f 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -866,6 +866,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
  * Note that PGDIR_SIZE must evenly divide TASK_SIZE.
  * Task size is:
  * -        0x9fc00000	(~2.5GB) for RV32.
+ * -        0x80000000	(   2GB) for RV64 compat mode
  * -      0x4000000000	( 256GB) for RV64 using SV39 mmu
  * -    0x800000000000	( 128TB) for RV64 using SV48 mmu
  * - 0x100000000000000	(  64PB) for RV64 using SV57 mmu
@@ -877,10 +878,10 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
  * Similarly for SV57, bits 63–57 must be equal to bit 56.
  */
 #ifdef CONFIG_64BIT
-#define TASK_SIZE_64	(PGDIR_SIZE * PTRS_PER_PGD / 2)
+#define TASK_SIZE_64	(UL(1) << (VA_BITS - 1))
 
 #ifdef CONFIG_COMPAT
-#define TASK_SIZE_32	(_AC(0x80000000, UL))
+#define TASK_SIZE_32	(UL(1) << (VA_BITS_SV32 - 1))
 #define TASK_SIZE	(test_thread_flag(TIF_32BIT) ? \
 			 TASK_SIZE_32 : TASK_SIZE_64)
 #else
-- 
2.40.1


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WARNING: multiple messages have this Message-ID (diff)
From: guoren@kernel.org
To: linux-kernel@vger.kernel.org, paul.walmsley@sifive.com,
	palmer@dabbelt.com, alexghiti@rivosinc.com, charlie@rivosinc.com,
	xiao.w.wang@intel.com, guoren@kernel.org, david@redhat.com,
	panqinglin2020@iscas.ac.cn, rick.p.edgecombe@intel.com,
	willy@infradead.org, bjorn@rivosinc.com,
	conor.dooley@microchip.com, cleger@rivosinc.com,
	leobras@redhat.com
Cc: linux-riscv@lists.infradead.org, Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH V3 4/4] riscv: mm: Optimize TASK_SIZE definition
Date: Fri, 22 Dec 2023 06:57:03 -0500	[thread overview]
Message-ID: <20231222115703.2404036-5-guoren@kernel.org> (raw)
In-Reply-To: <20231222115703.2404036-1-guoren@kernel.org>

From: Guo Ren <guoren@linux.alibaba.com>

Unify the TASK_SIZE definition with VA_BITS for better readability.
Add COMPAT mode user address space info in the comment.

Reviewed-by: Leonardo Bras <leobras@redhat.com>
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
---
 arch/riscv/include/asm/pgtable.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index e415582276ec..271565e1956f 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -866,6 +866,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
  * Note that PGDIR_SIZE must evenly divide TASK_SIZE.
  * Task size is:
  * -        0x9fc00000	(~2.5GB) for RV32.
+ * -        0x80000000	(   2GB) for RV64 compat mode
  * -      0x4000000000	( 256GB) for RV64 using SV39 mmu
  * -    0x800000000000	( 128TB) for RV64 using SV48 mmu
  * - 0x100000000000000	(  64PB) for RV64 using SV57 mmu
@@ -877,10 +878,10 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
  * Similarly for SV57, bits 63–57 must be equal to bit 56.
  */
 #ifdef CONFIG_64BIT
-#define TASK_SIZE_64	(PGDIR_SIZE * PTRS_PER_PGD / 2)
+#define TASK_SIZE_64	(UL(1) << (VA_BITS - 1))
 
 #ifdef CONFIG_COMPAT
-#define TASK_SIZE_32	(_AC(0x80000000, UL))
+#define TASK_SIZE_32	(UL(1) << (VA_BITS_SV32 - 1))
 #define TASK_SIZE	(test_thread_flag(TIF_32BIT) ? \
 			 TASK_SIZE_32 : TASK_SIZE_64)
 #else
-- 
2.40.1


  parent reply	other threads:[~2023-12-22 11:57 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-22 11:56 [PATCH V3 0/4] riscv: mm: Fixup & Optimize COMPAT code guoren
2023-12-22 11:56 ` guoren
2023-12-22 11:57 ` [PATCH V3 1/4] riscv: mm: Fixup compat mode boot failure guoren
2023-12-22 11:57   ` guoren
2023-12-23  2:57   ` Leonardo Bras
2023-12-23  2:57     ` Leonardo Bras
2023-12-23  3:07     ` Guo Ren
2023-12-23  3:07       ` Guo Ren
2023-12-23  3:36       ` Charlie Jenkins
2023-12-23  3:36         ` Charlie Jenkins
2023-12-22 11:57 ` [PATCH V3 2/4] riscv: mm: Fixup compat arch_get_mmap_end guoren
2023-12-22 11:57   ` guoren
2023-12-23  2:51   ` Leonardo Bras
2023-12-23  2:51     ` Leonardo Bras
2023-12-23  3:39     ` Charlie Jenkins
2023-12-23  3:39       ` Charlie Jenkins
2023-12-22 11:57 ` [PATCH V3 3/4] riscv: mm: Remove unused TASK_SIZE_MIN guoren
2023-12-22 11:57   ` guoren
2024-01-24 18:35   ` Charlie Jenkins
2024-01-24 18:35     ` Charlie Jenkins
2023-12-22 11:57 ` guoren [this message]
2023-12-22 11:57   ` [PATCH V3 4/4] riscv: mm: Optimize TASK_SIZE definition guoren
2024-01-24 18:36   ` Charlie Jenkins
2024-01-24 18:36     ` Charlie Jenkins
2024-01-12  6:30 ` [PATCH V3 0/4] riscv: mm: Fixup & Optimize COMPAT code patchwork-bot+linux-riscv
2024-01-12  6:30   ` patchwork-bot+linux-riscv

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