Re: [RFC V2 1/6] loongarch/mm: Stop using pte_ERROR()

["David Hildenbrand (Arm)" <david@kernel.org>]

On 8/11/26 06:21, Anshuman Khandual wrote:
> Directly use pr_err() in __set_fixmap() and drop pte_ERROR() which helps in
> eventually dropping pte_ERROR() macro across the tree. In this new printing
> __FILE__ and __LINE__ has been dropped because they are always the same and
> don't really add any value.
> 
> Cc: Huacai Chen <chenhuacai@kernel.org>
> Cc: WANG Xuerui <kernel@xen0n.name>
> Cc: loongarch@lists.linux.dev
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
> ---
>  arch/loongarch/include/asm/pgtable.h | 2 --
>  arch/loongarch/mm/init.c             | 2 +-
>  2 files changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h
> index 223528c04d73..a32a8fff70c1 100644
> --- a/arch/loongarch/include/asm/pgtable.h
> +++ b/arch/loongarch/include/asm/pgtable.h
> @@ -128,8 +128,6 @@ struct vm_area_struct;
>  #define ptep_get(ptep) READ_ONCE(*(ptep))
>  #define pmdp_get(pmdp) READ_ONCE(*(pmdp))
>  
> -#define pte_ERROR(e) \
> -	pr_err("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e))
>  #ifndef __PAGETABLE_PMD_FOLDED
>  #define pmd_ERROR(e) \
>  	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
> diff --git a/arch/loongarch/mm/init.c b/arch/loongarch/mm/init.c
> index 3407030f3e7a..be9b127daef2 100644
> --- a/arch/loongarch/mm/init.c
> +++ b/arch/loongarch/mm/init.c
> @@ -203,7 +203,7 @@ void __init __set_fixmap(enum fixed_addresses idx,
>  
>  	ptep = populate_kernel_pte(addr);
>  	if (!pte_none(ptep_get(ptep))) {
> -		pte_ERROR(*ptep);
> +		pr_err("bad pte %016lx\n", pte_val(*ptep));
>  		return;
>  	}
>  

Ah, I missed that we want to print actual values, I somehow thought that we
would be printing pte_none() ...

Maybe we should just be more verbose while at it?

pr_err("unexpected set PTE at %ul in __set_fixmap: %016lx\n",
       addr, pte_val(*ptep));

-- 
Cheers,

David