The patch titled
Subject: arm64: support initrd outside kernel linear map
has been added to the -mm tree. Its filename is
arm64-support-initrd-outside-kernel-linear-map.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arm64-support-initrd-outside-kernel-linear-map.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arm64-support-initrd-outside-kernel-linear-map.patch
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------------------------------------------------------
From: Mark Salter <msalter@xxxxxxxxxx>
Subject: arm64: support initrd outside kernel linear map
The use of mem= could leave part or all of the initrd outside of the
kernel linear map. This will lead to an error when unpacking the initrd
and a probable failure to boot. This patch catches that situation and
relocates the initrd to be fully within the linear map.
Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/setup.c | 55 ++++++++++++++++++++++++++++++++++++
1 file changed, 55 insertions(+)
diff -puN arch/arm64/kernel/setup.c~arm64-support-initrd-outside-kernel-linear-map arch/arm64/kernel/setup.c
--- a/arch/arm64/kernel/setup.c~arm64-support-initrd-outside-kernel-linear-map
+++ a/arch/arm64/kernel/setup.c
@@ -359,6 +359,60 @@ static void __init request_standard_reso
}
}
+/*
+ * Relocate initrd if it is not completely within the linear mapping.
+ * This would be the case if mem= cuts out all or part of it.
+ */
+static void __init relocate_initrd(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+ phys_addr_t orig_start = __virt_to_phys(initrd_start);
+ phys_addr_t orig_end = __virt_to_phys(initrd_end);
+ phys_addr_t ram_end = memblock_end_of_DRAM();
+ phys_addr_t new_start;
+ unsigned long size, to_free = 0;
+ void *dest;
+
+ if (orig_end <= ram_end)
+ return;
+
+ /* Note if any of original initrd will freeing below */
+ if (orig_start < ram_end)
+ to_free = ram_end - orig_start;
+
+ size = orig_end - orig_start;
+
+ /* initrd needs to be relocated completely inside linear mapping */
+ new_start = memblock_find_in_range(0, PFN_PHYS(max_pfn),
+ size, PAGE_SIZE);
+ if (!new_start)
+ panic("Cannot relocate initrd of size %ld\n", size);
+ memblock_reserve(new_start, size);
+
+ initrd_start = __phys_to_virt(new_start);
+ initrd_end = initrd_start + size;
+
+ pr_info("Moving initrd from [%llx-%llx] to [%llx-%llx]\n",
+ orig_start, orig_start + size - 1,
+ new_start, new_start + size - 1);
+
+ dest = (void *)initrd_start;
+
+ if (to_free) {
+ memcpy(dest, (void *)__phys_to_virt(orig_start), to_free);
+ dest += to_free;
+ }
+
+ copy_from_early_mem(dest, orig_start + to_free, size - to_free);
+
+ if (to_free) {
+ pr_info("Freeing original RAMDISK from [%llx-%llx]\n",
+ orig_start, orig_start + to_free - 1);
+ memblock_free(orig_start, to_free);
+ }
+#endif
+}
+
u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID };
void __init setup_arch(char **cmdline_p)
@@ -392,6 +446,7 @@ void __init setup_arch(char **cmdline_p)
acpi_boot_table_init();
paging_init();
+ relocate_initrd();
request_standard_resources();
early_ioremap_reset();
_
Patches currently in -mm which might be from msalter@xxxxxxxxxx are
mm-add-utility-for-early-copy-from-unmapped-ram.patch
arm64-support-initrd-outside-kernel-linear-map.patch
x86-use-generic-early-mem-copy.patch
linux-next.patch
mm-mpx-add-vm_flags_t-vm_flags-arg-to-do_mmap_pgoff-fix.patch
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