Re: [PATCH 0/2] riscv: fix debug_pagealloc

From: Nam Cao
Date: Wed May 15 2024 - 03:39:59 EST


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

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
>