linux-kernel - Re: [PATCH] sparc/mm: export symbols for lazy_mmu

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Message-ID: <3ae6e07c-c99e-476e-b9d8-49b999e87197@arm.com>
Date: Mon, 12 Jan 2026 11:09:18 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 "David Hildenbrand (Red Hat)" <david@...nel.org>, sparclinux@...r.kernel.org
Subject: Re: [PATCH] sparc/mm: export symbols for lazy_mmu_mode KUnit tests

On 18/12/2025 11:05, Kevin Brodsky wrote:
> Upcoming KUnit tests will call lazy_mmu_mode_{enable,disable}.
> These tests may be built as a module, and because of inlining this
> means that arch_{enter,flush,leave}_lazy_mmu_mode need to be
> exported.
>
> Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
> ---
>
> The CI reports that sparc needs pretty much the same time treatment as
> powerpc... Here's another patch to take care of that.
>
> Andrew, could you please add it after the powerpc one? At this point it's
> probably best to remove the comment above MODULE_IMPORT_NS() in
> mm/tests/lazy_mmu_mode_kunit.c. Thank you and sorry for the noise!

Gentle ping - I think we need this patch in mm-unstable, the CI has been
complaining as well. Thanks!

- Kevin

> ---
>  arch/sparc/mm/tlb.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/sparc/mm/tlb.c b/arch/sparc/mm/tlb.c
> index 3a852071d260..6d9dd5eb1328 100644
> --- a/arch/sparc/mm/tlb.c
> +++ b/arch/sparc/mm/tlb.c
> @@ -11,6 +11,8 @@
>  #include <linux/preempt.h>
>  #include <linux/pagemap.h>
>  
> +#include <kunit/visibility.h>
> +
>  #include <asm/tlbflush.h>
>  #include <asm/cacheflush.h>
>  #include <asm/mmu_context.h>
> @@ -54,6 +56,8 @@ void arch_enter_lazy_mmu_mode(void)
>  {
>  	preempt_disable();
>  }
> +/* For lazy_mmu_mode KUnit tests */
> +EXPORT_SYMBOL_IF_KUNIT(arch_enter_lazy_mmu_mode);
>  
>  void arch_flush_lazy_mmu_mode(void)
>  {
> @@ -62,12 +66,14 @@ void arch_flush_lazy_mmu_mode(void)
>  	if (tb->tlb_nr)
>  		flush_tlb_pending();
>  }
> +EXPORT_SYMBOL_IF_KUNIT(arch_flush_lazy_mmu_mode);
>  
>  void arch_leave_lazy_mmu_mode(void)
>  {
>  	arch_flush_lazy_mmu_mode();
>  	preempt_enable();
>  }
> +EXPORT_SYMBOL_IF_KUNIT(arch_leave_lazy_mmu_mode);
>  
>  static void tlb_batch_add_one(struct mm_struct *mm, unsigned long vaddr,
>  			      bool exec, unsigned int hugepage_shift)
>
> base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8