linux-kernel - [PATCH 1/1] initrd: move initrd_start calculate within linear mapping range check

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Date:   Tue, 12 Mar 2019 11:17:20 +0800
From:   pierre Kuo <vichy.kuo@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pierre Kuo <vichy.kuo@...il.com>
Subject: [PATCH 1/1] initrd: move initrd_start calculate within linear mapping range check

in the previous case, initrd_start and initrd_end can be successfully
returned even (base < memblock_start_of_DRAM()) or (base + size >
memblock_start_of_DRAM() + linear_region_size).

That means even linear mapping range check fail for initrd_start and
initrd_end, it still can get virtual address. Here we put
initrd_start/initrd_end to be calculated only when linear mapping check
pass.

Signed-off-by: pierre Kuo <vichy.kuo@...il.com>
---
 arch/arm64/mm/init.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 7205a9085b4d..1adf418de685 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -425,6 +425,9 @@ void __init arm64_memblock_init(void)
 			memblock_remove(base, size); /* clear MEMBLOCK_ flags */
 			memblock_add(base, size);
 			memblock_reserve(base, size);
+			/* the generic initrd code expects virtual addresses */
+			initrd_start = __phys_to_virt(phys_initrd_start);
+			initrd_end = initrd_start + phys_initrd_size;
 		}
 	}
 
@@ -450,11 +453,6 @@ void __init arm64_memblock_init(void)
 	 * pagetables with memblock.
 	 */
 	memblock_reserve(__pa_symbol(_text), _end - _text);
-	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && phys_initrd_size) {
-		/* the generic initrd code expects virtual addresses */
-		initrd_start = __phys_to_virt(phys_initrd_start);
-		initrd_end = initrd_start + phys_initrd_size;
-	}
 
 	early_init_fdt_scan_reserved_mem();
 
-- 
2.17.1