linux-kernel - [PATCH v4 08/10] arm64: kdump: Remove custom linux,usable-memory-range parsing

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Message-Id: <8ee4eacc4ce00b95fdb4b28daf3eb597212c5941.1626266516.git.geert+renesas@glider.be>
Date:   Wed, 14 Jul 2021 14:50:18 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Nicolas Pitre <nico@...xnic.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Nick Kossifidis <mick@....forth.gr>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Frank Rowand <frowand.list@...il.com>,
        Dave Young <dyoung@...hat.com>, Mike Rapoport <rppt@...nel.org>
Cc:     Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, kexec@...ts.infradead.org,
        linux-mm@...ck.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH v4 08/10] arm64: kdump: Remove custom linux,usable-memory-range parsing

Remove the architecture-specific code for parsing the
"linux,usable-memory-range" property under the "/chosen" node in DT, as
the platform-agnostic handling in the FDT core code already takes care
of this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
v4:
  - New.
---
 arch/arm64/mm/init.c | 34 +---------------------------------
 1 file changed, 1 insertion(+), 33 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 946e246660f2b180..f90ba99437c0f3c9 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -227,44 +227,12 @@ static int __init early_mem(char *p)
 }
 early_param("mem", early_mem);
 
-static int __init early_init_dt_scan_usablemem(unsigned long node,
-		const char *uname, int depth, void *data)
-{
-	struct memblock_region *usablemem = data;
-	const __be32 *reg;
-	int len;
-
-	if (depth != 1 || strcmp(uname, "chosen") != 0)
-		return 0;
-
-	reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len);
-	if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells)))
-		return 1;
-
-	usablemem->base = dt_mem_next_cell(dt_root_addr_cells, &reg);
-	usablemem->size = dt_mem_next_cell(dt_root_size_cells, &reg);
-
-	return 1;
-}
-
-static void __init fdt_enforce_memory_region(void)
-{
-	struct memblock_region reg = {
-		.size = 0,
-	};
-
-	of_scan_flat_dt(early_init_dt_scan_usablemem, &reg);
-
-	if (reg.size)
-		memblock_cap_memory_range(reg.base, reg.size);
-}
-
 void __init arm64_memblock_init(void)
 {
 	const s64 linear_region_size = PAGE_END - _PAGE_OFFSET(vabits_actual);
 
 	/* Handle linux,usable-memory-range property */
-	fdt_enforce_memory_region();
+	memblock_cap_memory_range(cap_mem_addr, cap_mem_size);
 
 	/* Remove memory above our supported physical address size */
 	memblock_remove(1ULL << PHYS_MASK_SHIFT, ULLONG_MAX);
-- 
2.25.1