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

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Message-ID: <CAM7-yPTdihLsPjDKM-0OEszxNd8n0bgeRseiEkCsSZW-uuaRvw@mail.gmail.com>
Date:   Tue, 30 Aug 2022 13:28:19 +0900
From:   Yun Levi <ppbuk5246@...il.com>
To:     will@...nel.org, chenzhou10@...wei.com, nramas@...ux.microsoft.com,
        thunder.leizhen@...wei.com
Cc:     linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kexec@...ts.infradead.org
Subject: [PATCH-RESEND] 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