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riscv: mm: Do not restrict mmap address based on hint

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The hint address should not forcefully restrict the addresses returned
by mmap as this causes mmap to report ENOMEM when there is memory still
available.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Fixes: b5b4287acc ("riscv: mm: Use hint address in mmap if available")
Fixes: add2cc6b65 ("RISC-V: mm: Restrict address space for sv39,sv48,sv57")
Closes: https://lore.kernel.org/linux-kernel/ZbxTNjQPFKBatMq+@ghost/T/#mccb1890466bf5a488c9ce7441e57e42271895765
Link: https://lore.kernel.org/r/20240826-riscv_mmap-v1-3-cd8962afe47f@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Charlie Jenkins 2024-08-26 09:36:47 -07:00 committed by Palmer Dabbelt
parent 83dae72ac0
commit 2116988d53
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1 changed files with 2 additions and 24 deletions
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26
arch/riscv/include/asm/processor.h
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@ -14,36 +14,14 @@
#include <asm/ptrace.h>
/*
* addr is a hint to the maximum userspace address that mmap should provide, so
* this macro needs to return the largest address space available so that
* mmap_end < addr, being mmap_end the top of that address space.
* See Documentation/arch/riscv/vm-layout.rst for more details.
*/
#define arch_get_mmap_end(addr, len, flags) \
({ \
unsigned long mmap_end; \
typeof(addr) _addr = (addr); \
if ((_addr) == 0 || is_compat_task() || \
((_addr + len) > BIT(VA_BITS - 1))) \
mmap_end = STACK_TOP_MAX; \
else \
mmap_end = (_addr + len); \
mmap_end; \
STACK_TOP_MAX; \
})
#define arch_get_mmap_base(addr, base) \
({ \
unsigned long mmap_base; \
typeof(addr) _addr = (addr); \
typeof(base) _base = (base); \
unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \
if ((_addr) == 0 || is_compat_task() || \
((_addr + len) > BIT(VA_BITS - 1))) \
mmap_base = (_base); \
else \
mmap_base = (_addr + len) - rnd_gap; \
mmap_base; \
base; \
})
#ifdef CONFIG_64BIT