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From:   Song Shuai <songshuaishuai@tinylab.org>
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Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
Subject: [PATCH V1 1/3] Revert "RISC-V: mark hibernation as nonportable"
Date:   Sun, 25 Jun 2023 22:09:29 +0800
Message-Id: <20230625140931.1266216-2-songshuaishuai@tinylab.org>
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This reverts commit ed309ce522185583b163bd0c74f0d9f299fe1826.

With the commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the
linear mapping") reverted, the MIN_MEMBLOCK_ADDR points the kernel
load address which was placed at a PMD boundary. And firmware always
correctly mark resident memory, or memory protected with PMP as
per the devicetree specification and/or the UEFI specification.

So those regions will not be mapped in the linear mapping and they
can be safely saved/restored by hibernation.

Signed-off-by: Song Shuai <songshuaishuai@tinylab.org>
---
 arch/riscv/Kconfig | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 5966ad97c30c..17b5fc7f54d4 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -800,11 +800,8 @@ menu "Power management options"
 
 source "kernel/power/Kconfig"
 
-# Hibernation is only possible on systems where the SBI implementation has
-# marked its reserved memory as not accessible from, or does not run
-# from the same memory as, Linux
 config ARCH_HIBERNATION_POSSIBLE
-	def_bool NONPORTABLE
+	def_bool y
 
 config ARCH_HIBERNATION_HEADER
 	def_bool HIBERNATION
-- 
2.20.1