linux-kernel - [RFC PATCH v2 15/21] riscv: mm: Adjust FIX_BTMAPS_SLOTS for variable PAGE

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Message-Id: <20241205103729.14798-16-luxu.kernel@bytedance.com>
Date: Thu,  5 Dec 2024 18:37:23 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	ardb@...nel.org,
	anup@...infault.org,
	atishp@...shpatra.org
Cc: xieyongji@...edance.com,
	lihangjing@...edance.com,
	punit.agrawal@...edance.com,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [RFC PATCH v2 15/21] riscv: mm: Adjust FIX_BTMAPS_SLOTS for variable PAGE_SIZE

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/include/asm/fixmap.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/fixmap.h b/arch/riscv/include/asm/fixmap.h
index 0a55099bb734..17bf31334bd5 100644
--- a/arch/riscv/include/asm/fixmap.h
+++ b/arch/riscv/include/asm/fixmap.h
@@ -44,7 +44,8 @@ enum fixed_addresses {
 	 * before ioremap() is functional.
 	 */
 #define NR_FIX_BTMAPS		(SZ_256K / PAGE_SIZE)
-#define FIX_BTMAPS_SLOTS	7
+#define FIX_BTMAPS_SIZE		(FIXADDR_SIZE - ((FIX_BTMAP_END + 1) << PAGE_SHIFT))
+#define FIX_BTMAPS_SLOTS	(FIX_BTMAPS_SIZE / SZ_256K)
 #define TOTAL_FIX_BTMAPS	(NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
 
 	FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
-- 
2.20.1