linux-kernel - [PATCH V1 2/3] Revert "riscv: Check the virtual alignment before choosing a map size"

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Date:   Sun, 25 Jun 2023 22:09:30 +0800
From:   Song Shuai <songshuaishuai@...ylab.org>
To:     paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, robh+dt@...nel.org, frowand.list@...il.com,
        ajones@...tanamicro.com, alexghiti@...osinc.com,
        mpe@...erman.id.au, arnd@...db.de, songshuaishuai@...ylab.org,
        rppt@...nel.org, samuel@...lland.org, panqinglin2020@...as.ac.cn,
        conor.dooley@...rochip.com, anup@...infault.org,
        xianting.tian@...ux.alibaba.com, anshuman.khandual@....com,
        heiko@...ech.de
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: [PATCH V1 2/3] Revert "riscv: Check the virtual alignment before choosing a map size"

This reverts commit 49a0a3731596fc004db6eec3fc674d92a09ef383.

With the commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the
linear mapping") reverted, best_map_size() only uses PMD_SIZE or PAGE_SIZE
for linear mapping and the phys_ram_base that va_pa_offset is based on
points the kernel load address which is 2M-aligned for rv64.

So no need to check the virtual alignment before choosing a map size.

Signed-off-by: Song Shuai <songshuaishuai@...ylab.org>
---
 arch/riscv/mm/init.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 4fa420faa780..38c4b4d6b64f 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -660,19 +660,18 @@ void __init create_pgd_mapping(pgd_t *pgdp,
 	create_pgd_next_mapping(nextp, va, pa, sz, prot);
 }
 
-static uintptr_t __init best_map_size(phys_addr_t pa, uintptr_t va,
-				      phys_addr_t size)
+static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 {
-	if (!(pa & (PGDIR_SIZE - 1)) && !(va & (PGDIR_SIZE - 1)) && size >= PGDIR_SIZE)
+	if (!(base & (PGDIR_SIZE - 1)) && size >= PGDIR_SIZE)
 		return PGDIR_SIZE;
 
-	if (!(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE)
+	if (!(base & (P4D_SIZE - 1)) && size >= P4D_SIZE)
 		return P4D_SIZE;
 
-	if (!(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE)
+	if (!(base & (PUD_SIZE - 1)) && size >= PUD_SIZE)
 		return PUD_SIZE;
 
-	if (!(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE)
+	if (!(base & (PMD_SIZE - 1)) && size >= PMD_SIZE)
 		return PMD_SIZE;
 
 	return PAGE_SIZE;
@@ -1178,7 +1177,7 @@ static void __init create_linear_mapping_range(phys_addr_t start,
 	for (pa = start; pa < end; pa += map_size) {
 		va = (uintptr_t)__va(pa);
 		map_size = fixed_map_size ? fixed_map_size :
-					    best_map_size(pa, va, end - pa);
+					    best_map_size(pa, end - pa);
 
 		create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
 				   pgprot_from_va(va));
-- 
2.20.1