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riscv: Remove redundant restriction on memory size

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The original reason for reserving the top 4GiB of the direct map
(space for modules/BPF/kernel) hasn't applied since the address
map was reworked for KASAN.

Signed-off-by: Stuart Menefy <stuart.menefy@codasip.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240624121723.2186279-1-stuart.menefy@codasip.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Stuart Menefy 2024-06-24 13:17:23 +01:00 committed by Palmer Dabbelt
parent 7587a3602b
commit d6a1928134
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1 changed files with 1 additions and 7 deletions
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8
arch/riscv/mm/init.c
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@ -1132,13 +1132,7 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ?
0UL : PAGE_OFFSET - kernel_map.phys_addr;
/*
* The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
* kernel, whereas for 64-bit kernel, the end of the virtual address
* space is occupied by the modules/BPF/kernel mappings which reduces
* the available size of the linear mapping.
*/
memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
memory_limit = KERN_VIRT_SIZE;
/* Sanity check alignment and size */
BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);