Patch "riscv: mm: Fix prototype to avoid discarding const" has been added to the 6.8-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    riscv: mm: Fix prototype to avoid discarding const

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-mm-fix-prototype-to-avoid-discarding-const.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 a95b9c7c5f9e26d5da6f331bdd0951931addc81b
Author: Samuel Holland <samuel.holland@xxxxxxxxxx>
Date:   Fri Mar 1 12:18:32 2024 -0800

    riscv: mm: Fix prototype to avoid discarding const
    
    [ Upstream commit 674bc0168e6b68070c75df22e97ab63b6eb60d89 ]
    
    __flush_tlb_range() does not modify the provided cpumask, so its cmask
    parameter can be pointer-to-const. This avoids the unsafe cast of
    cpu_online_mask.
    
    Fixes: 54d7431af73e ("riscv: Add support for BATCHED_UNMAP_TLB_FLUSH")
    Signed-off-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
    Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
    Reviewed-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240301201837.2826172-1-samuel.holland@xxxxxxxxxx
    Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 893566e004b73..07d743f87b3f6 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -99,7 +99,7 @@ static void __ipi_flush_tlb_range_asid(void *info)
 	local_flush_tlb_range_asid(d->start, d->size, d->stride, d->asid);
 }
 
-static void __flush_tlb_range(struct cpumask *cmask, unsigned long asid,
+static void __flush_tlb_range(const struct cpumask *cmask, unsigned long asid,
 			      unsigned long start, unsigned long size,
 			      unsigned long stride)
 {
@@ -200,7 +200,7 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
 
 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 {
-	__flush_tlb_range((struct cpumask *)cpu_online_mask, FLUSH_TLB_NO_ASID,
+	__flush_tlb_range(cpu_online_mask, FLUSH_TLB_NO_ASID,
 			  start, end - start, PAGE_SIZE);
 }