linux-kernel - [PATCH] arm64/kexec: Fix missing extra range for crashkres

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Date:   Thu,  4 Aug 2022 00:12:17 +0900
From:   Levi Yun <ppbuk5246@...il.com>
To:     catalin.marinas@....com, will@...nel.org, chenzhou10@...wei.com,
        nramas@...ux.microsoft.com, thunder.leizhen@...wei.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Levi Yun <ppbuk5246@...il.com>
Subject: [PATCH] arm64/kexec: Fix missing extra range for crashkres_low.

Like crashk_res, Calling crash_exclude_mem_range function with
crashk_low_res area would need extra crash_mem range too.
Add one extra crash_mem range when crashk_low_res is used.

Signed-off-by: Levi Yun <ppbuk5246@...il.com>
---
 arch/arm64/kernel/machine_kexec_file.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
index 889951291cc0..378aee04e7d4 100644
--- a/arch/arm64/kernel/machine_kexec_file.c
+++ b/arch/arm64/kernel/machine_kexec_file.c
@@ -51,6 +51,9 @@ static int prepare_elf_headers(void **addr, unsigned long *sz)
 	for_each_mem_range(i, &start, &end)
 		nr_ranges++;

+	if (crashk_low_res.end)
+		nr_ranges++; /**< for exclusion of crashkernel=size,low region */
+
 	cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL);
 	if (!cmem)
 		return -ENOMEM;
--
2.35.1