linux-kernel - [PATCH v2 6/8] riscv: drop the use of XIP_OFFSET in kernel_mapping_va_to

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Message-Id: <644c13d9467525a06f5d63d157875a35b2edb4bc.1717789719.git.namcao@linutronix.de>
Date: Fri,  7 Jun 2024 22:22:11 +0200
From: Nam Cao <namcao@...utronix.de>
To: Alexandre Ghiti <alexghiti@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 6/8] riscv: drop the use of XIP_OFFSET in kernel_mapping_va_to_pa()

XIP_OFFSET is the hard-coded offset of writable data section within the
kernel.

By hard-coding this value, the read-only section of the kernel (which is
placed before the writable data section) is restricted in size.

As a preparation to remove this hard-coded macro XIP_OFFSET entirely,
remove the use of XIP_OFFSET in kernel_mapping_va_to_pa(). The macro
XIP_OFFSET is used in this case to check if the virtual address is mapped
to Flash or to RAM. The same check can be done with kernel_map.xiprom_sz.

Signed-off-by: Nam Cao <namcao@...utronix.de>
Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
---
 arch/riscv/include/asm/page.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index b1fcf0d733c4..cda4a917f90a 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -159,7 +159,7 @@ phys_addr_t linear_mapping_va_to_pa(unsigned long x);
 #ifdef CONFIG_XIP_KERNEL
 #define kernel_mapping_va_to_pa(y) ({						\
 	unsigned long _y = (unsigned long)(y);					\
-	(_y < kernel_map.virt_addr + XIP_OFFSET) ?				\
+	(_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ?			\
 		(_y - kernel_map.va_kernel_xip_text_pa_offset) :		\
 		(_y - kernel_map.va_kernel_xip_data_pa_offset);			\
 	})
-- 
2.39.2