kevin/linux
1
Fork 0
Code

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

Browse Source 
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
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
1 changed files with 2 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
arch/riscv/include/asm/processor.h
View File

@ -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