Unverified Commit d6a19281 authored by Stuart Menefy's avatar Stuart Menefy Committed by Palmer Dabbelt
Browse files

riscv: Remove redundant restriction on memory size 



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: default avatarStuart Menefy <stuart.menefy@codasip.com>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240624121723.2186279-1-stuart.menefy@codasip.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 7587a360

arch/riscv/mm/init.c

+1 −7
Original line number Diff line number Diff line
@@ -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);