linux-kernel - Re: [PATCH] arm64: Fix the ptep_set_wrprotect() to set PTE_DIRTY if (PTE_DBM && !PTE

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Date:	Thu, 10 Mar 2016 18:39:51 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Ganapatrao Kulkarni <gpkulkarni@...il.com>
Cc:	Dann Frazier <dann.frazier@...onical.com>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: Fix the ptep_set_wrprotect() to set PTE_DIRTY if
 (PTE_DBM && !PTE_RDONLY)

On Thu, Mar 10, 2016 at 08:34:46AM +0530, Ganapatrao Kulkarni wrote:
> > On Wed, Mar 9, 2016 at 9:33 PM, Catalin Marinas <catalin.marinas@....com> wrote:
> >> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> >> index 7c73b365fcfa..b409a983f870 100644
> >> --- a/arch/arm64/include/asm/pgtable.h
> >> +++ b/arch/arm64/include/asm/pgtable.h
> >> @@ -201,7 +201,7 @@ extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
> >>  static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
> >>                               pte_t *ptep, pte_t pte)
> >>  {
> >> -       if (pte_valid(pte)) {
> >> +       if (pte_present(pte)) {
> >>                 if (pte_sw_dirty(pte) && pte_write(pte))
> >>                         pte_val(pte) &= ~PTE_RDONLY;
> >>                 else
>
> this diff works for me.
> 
> Tested-by: Ganapatrao Kulkarni <gkulkarni@...ium.com>

Thanks. I'll push it out during the merging window and cc stable (though
it needs a slightly different workaround for 4.4 anyway).

-- 
Catalin