[PATCH 0/2] riscv: fix debug_pagealloc

From: Nam Cao <namcao@linutronix.de>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Alexandre Ghiti <alexghiti@rivosinc.com>,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Cc: Nam Cao <namcao@linutronix.de>
Subject: [PATCH 0/2] riscv: fix debug_pagealloc
Date: Wed, 15 May 2024 07:50:38 +0200	[thread overview]
Message-ID: <cover.1715750938.git.namcao@linutronix.de> (raw)

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

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