Unverified Commit 6065e736 authored by Samuel Holland's avatar Samuel Holland Committed by Palmer Dabbelt
Browse files

riscv: Fix TASK_SIZE on 64-bit NOMMU 



On NOMMU, userspace memory can come from anywhere in physical RAM. The
current definition of TASK_SIZE is wrong if any RAM exists above 4G,
causing spurious failures in the userspace access routines.

Fixes: 6bd33e1e ("riscv: add nommu support")
Fixes: c3f896dc ("mm: switch the test_vmalloc module to use __vmalloc_node")
Signed-off-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Reviewed-by: default avatarJisheng Zhang <jszhang@kernel.org>
Reviewed-by: default avatarBo Gan <ganboing@gmail.com>
Link: https://lore.kernel.org/r/20240227003630.3634533-2-samuel.holland@sifive.com


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 6613476e

arch/riscv/include/asm/pgtable.h

+1 −1
Original line number Diff line number Diff line
@@ -882,7 +882,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) 
#define PAGE_SHARED		__pgprot(0)

#define PAGE_KERNEL		__pgprot(0)

#define swapper_pg_dir		NULL

#define TASK_SIZE		0xffffffffUL

#define TASK_SIZE		_AC(-1, UL)

#define VMALLOC_START		_AC(0, UL)

#define VMALLOC_END		TASK_SIZE