This is a note to let you know that I've just added the patch titled
riscv: Fix TASK_SIZE on 64-bit NOMMU
to the 5.15-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-fix-task_size-on-64-bit-nommu.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 189f7d027f8eaa66d014d452ff12a715b058fe49
Author: Samuel Holland <samuel.holland@xxxxxxxxxx>
Date: Mon Feb 26 16:34:46 2024 -0800
riscv: Fix TASK_SIZE on 64-bit NOMMU
[ Upstream commit 6065e736f82c817c9a597a31ee67f0ce4628e948 ]
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: 6bd33e1ece52 ("riscv: add nommu support")
Fixes: c3f896dcf1e4 ("mm: switch the test_vmalloc module to use __vmalloc_node")
Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
Reviewed-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
Reviewed-by: Bo Gan <ganboing@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240227003630.3634533-2-samuel.holland@xxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 17e22eb76a815..776528fd64050 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -675,7 +675,7 @@ 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
