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riscv: Fix TASK_SIZE on 64-bit NOMMU

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[ Upstream commit 6065e736f8 ]

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: 6bd33e1ece ("riscv: add nommu support")
Fixes: c3f896dcf1 ("mm: switch the test_vmalloc module to use __vmalloc_node")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Bo Gan <ganboing@gmail.com>
Link: https://lore.kernel.org/r/20240227003630.3634533-2-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Samuel Holland 2024-02-26 16:34:46 -08:00 committed by Greg Kroah-Hartman
parent 0b947c90e3
commit 4201b8c8f2
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/include/asm/pgtable.h
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@ -799,7 +799,7 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
#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