linux-kernel - [RFC PATCH] ARM: Support allocating crashkernel above 4G for LPAE

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Message-ID: <20240802092510.3915986-1-ruanjinjie@huawei.com>
Date: Fri, 2 Aug 2024 17:25:10 +0800
From: Jinjie Ruan <ruanjinjie@...wei.com>
To: <linux@...linux.org.uk>, <bhe@...hat.com>, <akpm@...ux-foundation.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [RFC PATCH] ARM: Support allocating crashkernel above 4G for LPAE

As ARM LPAE feature support accessing memory beyond the 4G limit, define
HAVE_ARCH_CRASHKERNEL_RESERVATION_HIGH macro to support reserving crash
memory above 4G for ARM32 LPAE.

No test because there is no LPAE ARM32 hardware.

Signed-off-by: Jinjie Ruan <ruanjinjie@...wei.com>
---
 arch/arm/include/asm/crash_reserve.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/crash_reserve.h b/arch/arm/include/asm/crash_reserve.h
index 85c9298bd3b7..33a2f18b0ec1 100644
--- a/arch/arm/include/asm/crash_reserve.h
+++ b/arch/arm/include/asm/crash_reserve.h
@@ -19,6 +19,10 @@ static inline unsigned long crash_addr_low_max(void)
 	return (crash_max > lowmem_max) ? lowmem_max : crash_max;
 }
 
-
 #define HAVE_ARCH_ADD_CRASH_RES_TO_IOMEM_EARLY
+
+#if defined(CONFIG_ARM_LPAE) && defined(CONFIG_HIGHMEM)
+#define HAVE_ARCH_CRASHKERNEL_RESERVATION_HIGH
+#endif
+
 #endif
-- 
2.34.1