linux-kernel - Re: [PATCH 0/2] riscv: fix debug

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Date: Wed, 15 May 2024 09:39:47 +0200
From: Nam Cao <namcao@...utronix.de>
To: Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Ghiti <alexghiti@...osinc.com>,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Zong Li <zong.li@...ive.com>
Subject: Re: [PATCH 0/2] riscv: fix debug_pagealloc

Forgot to Cc the original author.
+Cc: Zong Li <zong.li@...ive.com>

On Wed, May 15, 2024 at 07:50:38AM +0200, Nam Cao wrote:
> The debug_pagealloc feature is not functional on RISCV. With this feature
> enabled (CONFIG_DEBUG_PAGEALLOC=y and debug_pagealloc=on), kernel crashes
> early during boot.
> 
> QEMU command that can reproduce this problem:
>    qemu-system-riscv64 -machine virt \
>    -kernel Image \
>    -append "console=ttyS0 root=/dev/vda debug_pagealloc=on" \
>    -nographic \
>    -drive "file=root.img,format=raw,id=hd0" \
>    -device virtio-blk-device,drive=hd0 \
>    -m 4G \
> 
> This series makes debug_pagealloc functional.
> 
> Nam Cao (2):
>   riscv: force PAGE_SIZE linear mapping if debug_pagealloc is enabled
>   riscv: rewrite __kernel_map_pages() to fix sleeping in invalid context
> 
>  arch/riscv/mm/init.c     |  3 +++
>  arch/riscv/mm/pageattr.c | 28 ++++++++++++++++++++++------
>  2 files changed, 25 insertions(+), 6 deletions(-)
> 
> -- 
> 2.39.2
>