Patch "riscv: Fix TASK_SIZE on 64-bit NOMMU" has been added to the 6.8-stable tree

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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 6.8-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-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 1b41fc5f1fdb3151ccd908cae4711290341447ef
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 3422ced8a07fd..39c6bb8254683 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -888,7 +888,7 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte)
 #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
 




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