linux-kernel - [PATCH 4.19 323/422] MIPS: kexec: Relax memory restriction

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Message-Id: <20191119051419.940745799@linuxfoundation.org>
Date:   Tue, 19 Nov 2019 06:18:40 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rachel Mozes <rachel.mozes@...el.com>,
        Dengcheng Zhu <dzhu@...ecomp.com>,
        Paul Burton <paul.burton@...s.com>, pburton@...ecomp.com,
        ralf@...ux-mips.org, linux-mips@...ux-mips.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 323/422] MIPS: kexec: Relax memory restriction

From: Dengcheng Zhu <dzhu@...ecomp.com>

[ Upstream commit a6da4d6fdf8bd512c98d3ac7f1d16bc4bb282919 ]

We can rely on the system kernel and the dump capture kernel themselves in
memory usage.

Being restrictive with 512MB limit may cause kexec tool failure on some
platforms.

Tested-by: Rachel Mozes <rachel.mozes@...el.com>
Reported-by: Rachel Mozes <rachel.mozes@...el.com>
Signed-off-by: Dengcheng Zhu <dzhu@...ecomp.com>
Signed-off-by: Paul Burton <paul.burton@...s.com>
Patchwork: https://patchwork.linux-mips.org/patch/20568/
Cc: pburton@...ecomp.com
Cc: ralf@...ux-mips.org
Cc: linux-mips@...ux-mips.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/mips/include/asm/kexec.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/mips/include/asm/kexec.h b/arch/mips/include/asm/kexec.h
index 493a3cc7c39ad..cfdbe66575f4d 100644
--- a/arch/mips/include/asm/kexec.h
+++ b/arch/mips/include/asm/kexec.h
@@ -12,11 +12,11 @@
 #include <asm/stacktrace.h>
 
 /* Maximum physical address we can use pages from */
-#define KEXEC_SOURCE_MEMORY_LIMIT (0x20000000)
+#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
 /* Maximum address we can reach in physical address mode */
-#define KEXEC_DESTINATION_MEMORY_LIMIT (0x20000000)
+#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  /* Maximum address we can use for the control code buffer */
-#define KEXEC_CONTROL_MEMORY_LIMIT (0x20000000)
+#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
 /* Reserve 3*4096 bytes for board-specific info */
 #define KEXEC_CONTROL_PAGE_SIZE (4096 + 3*4096)
 
-- 
2.20.1