linux-kernel - [PATCH v4 2/6] arm64/mirror: arm64 enabling

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Message-ID: <20220613082147.183145-3-mawupeng1@huawei.com>
Date:   Mon, 13 Jun 2022 16:21:43 +0800
From:   Wupeng Ma <mawupeng1@...wei.com>
To:     <corbet@....net>, <will@...nel.org>, <ardb@...nel.org>,
        <catalin.marinas@....com>
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Subject: [PATCH v4 2/6] arm64/mirror: arm64 enabling - find mirrored memory ranges

From: Ma Wupeng <mawupeng1@...wei.com>

Commit b05b9f5f9dcf ("x86, mirror: x86 enabling - find mirrored memory ranges")
introduced mirrored memory support for x86 and this could be used on arm64.

Since we only support this feature on arm64, efi_find_mirror() won't be placed
into efi_init(), which is used by riscv/arm/arm64, it is added in setup_arch()
to scan the memory map and mark mirrored memory in memblock.

Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 Documentation/admin-guide/kernel-parameters.txt | 2 +-
 arch/arm64/kernel/setup.c                       | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 8090130b544b..e3537646b6f7 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2301,7 +2301,7 @@
 
 	keepinitrd	[HW,ARM]
 
-	kernelcore=	[KNL,X86,IA-64,PPC]
+	kernelcore=	[KNL,X86,IA-64,PPC,ARM64]
 			Format: nn[KMGTPE] | nn% | "mirror"
 			This parameter specifies the amount of memory usable by
 			the kernel for non-movable allocations.  The requested
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index cf3a759f10d4..6e9acd7ecf0f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -328,6 +328,7 @@ void __init __no_sanitize_address setup_arch(char **cmdline_p)
 
 	xen_early_init();
 	efi_init();
+	efi_find_mirror();
 
 	if (!efi_enabled(EFI_BOOT) && ((u64)_text % MIN_KIMG_ALIGN) != 0)
 	     pr_warn(FW_BUG "Kernel image misaligned at boot, please fix your bootloader!");
-- 
2.25.1