diff options
| author | Conor Dooley <conor.dooley@microchip.com> | 2022-10-21 17:00:30 +0100 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2022-11-29 11:48:04 -0800 |
| commit | 41555cc9e2e9778ddc7c0293a4a2e4995e332643 (patch) | |
| tree | dfdea2bf8f894eebf41948170570ea8cfcfdb95b /arch/riscv/configs | |
| parent | effae0e3d9e1139d583e9b5d050f4f948825b8a3 (diff) | |
RISC-V: enable sparsemem by default for defconfig
on an arch level, RISC-V defaults to FLATMEM. On PolarFire SoC, the
memory layout is almost always sparse, with a maximum of 1 GiB at
0x8000_0000 & a possible 16 GiB range at 0x10_0000_0000. The Icicle kit,
for example, has 2 GiB of DDR - so there's a big hole in the memory map
between the two gigs. Prior to v6.1-rc1, boot times from defconfig
builds were pretty bad on Icicle but enabling sparsemem would fix those
issues. As of v6.1-rc1, the Icicle kit no longer boots from defconfig
builds with the in-kernel devicetree. A change to the memory map
resulted in a futher "sparse-ification", producing a splat on boot:
OF: fdt: Ignoring memory range 0x80000000 - 0x80200000
Machine model: Microchip PolarFire-SoC Icicle Kit
earlycon: ns16550a0 at MMIO32 0x0000000020100000 (options '115200n8')
printk: bootconsole [ns16550a0] enabled
printk: debug: skip boot console de-registration.
efi: UEFI not found.
Zone ranges:
DMA32 [mem 0x0000000080200000-0x00000000ffffffff]
Normal [mem 0x0000000100000000-0x000000107fffffff]
Movable zone start for each node
Early memory node ranges
node 0: [mem 0x0000000080200000-0x00000000bfbfffff]
node 0: [mem 0x00000000bfc00000-0x00000000bfffffff]
node 0: [mem 0x0000001040000000-0x000000107fffffff]
Initmem setup node 0 [mem 0x0000000080200000-0x000000107fffffff]
Kernel panic - not syncing: Failed to allocate 1073741824 bytes for node 0 memory map
CPU: 0 PID: 0 Comm: swapper Not tainted 5.19.0-dirty #1
Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
Call Trace:
[<ffffffff800057f0>] show_stack+0x30/0x3c
[<ffffffff807d5802>] dump_stack_lvl+0x4a/0x66
[<ffffffff807d5836>] dump_stack+0x18/0x20
[<ffffffff807d1ae8>] panic+0x124/0x2c6
[<ffffffff80814064>] free_area_init_core+0x0/0x11e
[<ffffffff80813720>] free_area_init_node+0xc2/0xf6
[<ffffffff8081331e>] free_area_init+0x222/0x260
[<ffffffff808064d6>] misc_mem_init+0x62/0x9a
[<ffffffff80803cb2>] setup_arch+0xb0/0xea
[<ffffffff8080039a>] start_kernel+0x88/0x4ee
---[ end Kernel panic - not syncing: Failed to allocate 1073741824 bytes for node 0 memory map ]---
With the aim of keeping defconfig builds booting on icicle, enable
SPARSEMEM_MANUAL.
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221021160028.4042304-1-conor@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/configs')
| -rw-r--r-- | arch/riscv/configs/defconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/configs/defconfig b/arch/riscv/configs/defconfig index 05fd5fcf24f9..daba5d743862 100644 --- a/arch/riscv/configs/defconfig +++ b/arch/riscv/configs/defconfig @@ -38,6 +38,7 @@ CONFIG_KVM=m CONFIG_JUMP_LABEL=y CONFIG_MODULES=y CONFIG_MODULE_UNLOAD=y +CONFIG_SPARSEMEM_MANUAL=y CONFIG_BLK_DEV_THROTTLING=y CONFIG_NET=y CONFIG_PACKET=y |