linux-kernel - [RFC PATCH V1 09/11] riscv: Adjust fix_btmap slots number to match variable page size

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Date:   Thu, 23 Nov 2023 14:57:06 +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:     dengliang.1214@...edance.com, xieyongji@...edance.com,
        lihangjing@...edance.com, songmuchun@...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 V1 09/11] riscv: Adjust fix_btmap slots number to match variable page size

The existing fixmap slot number will cause the fixmap size to exceed
FIX_FDT_SIZE when base page becomes larger than 4K. This patch adjusts
the slot number to make them always match.

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