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Message-Id: <20220612043433.10469-1-dlan@gentoo.org>
Date: Sun, 12 Jun 2022 12:34:33 +0800
From: Yixun Lan <dlan@...too.org>
To: linux-riscv@...ts.infradead.org
Cc: Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Albert Ou <aou@...s.berkeley.edu>,
linux-kernel@...r.kernel.org, Yixun Lan <dlan@...too.org>
Subject: [PATCH] RISC-V: enable CONFIG_ARCH_KEEP_MEMBLOCK
Preserve the memblock info while CONFIG_DEBUG_FS is enabled.
So later, the information can be showed at:
/sys/kernel/debug/memblock/{memory,reserved}
Signed-off-by: Yixun Lan <dlan@...too.org>
---
Check mm/memblock.c:2120 for the code logic:
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_ARCH_KEEP_MEMBLOCK)
I've tested on unmatched board, with this patch applied
for example, we can see the memblock reserved info as:
# cat /sys/kernel/debug/memblock/reserved
0: 0x0000000080000000..0x000000008007ffff
1: 0x0000000080200000..0x00000000823fffff
2: 0x0000000088000000..0x000000008800307f
3: 0x00000000ec000000..0x00000000ffffffff
4: 0x000000046d600000..0x000000047edfffff
5: 0x000000047ee2d000..0x000000047eeecfff
6: 0x000000047eeed440..0x000000047eeed947
7: 0x000000047eeed980..0x000000047eeede1f
8: 0x000000047eeede40..0x000000047eeedfc7
9: 0x000000047eeee000..0x000000047ef59fff
10: 0x000000047ef5c000..0x000000047efdd05f
11: 0x000000047efdd080..0x000000047efdd29f
12: 0x000000047efdd2c0..0x000000047efdd3df
13: 0x000000047efdd400..0x000000047efdd41f
14: 0x000000047efdd440..0x000000047efdd44f
15: 0x000000047efdd480..0x000000047efdd487
16: 0x000000047efdd4c0..0x000000047efdd525
17: 0x000000047efdd540..0x000000047efdd5a5
18: 0x000000047efdd5c0..0x000000047ffdfa47
19: 0x000000047ffdfa78..0x000000047ffdfaa8
20: 0x000000047ffdfab0..0x000000047ffdfade
21: 0x000000047ffdfae0..0x000000047ffdfb0e
22: 0x000000047ffdfb10..0x000000047ffeeffb
---
arch/riscv/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c22f58155948..e457c5855222 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -32,6 +32,7 @@ config RISCV
select ARCH_HAS_STRICT_MODULE_RWX if MMU && !XIP_KERNEL
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UBSAN_SANITIZE_ALL
+ select ARCH_KEEP_MEMBLOCK
select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT
select ARCH_STACKWALK
--
2.35.1
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