This is a note to let you know that I've just added the patch titled
riscv: mm: Do not restrict mmap address based on hint
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
riscv-mm-do-not-restrict-mmap-address-based-on-hint.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 80336ce81b7b4acd1398cb41747e9494905a5d7b
Author: Charlie Jenkins <charlie@xxxxxxxxxxxx>
Date: Mon Aug 26 09:36:47 2024 -0700
riscv: mm: Do not restrict mmap address based on hint
[ Upstream commit 2116988d5372aec51f8c4fb85bf8e305ecda47a0 ]
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@xxxxxxxxxxxx>
Fixes: b5b4287accd7 ("riscv: mm: Use hint address in mmap if available")
Fixes: add2cc6b6515 ("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@xxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 68c3432dc6ea..6c129144ef19 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -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
