linux-kernel - Re: [PATCH 2/3] xen: remove unused function xen_set_domain

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Date:   Fri, 4 Aug 2017 15:20:30 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org, Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 2/3] xen: remove unused function xen_set_domain_pte()

On 08/04/2017 07:36 AM, Juergen Gross wrote:
> The function xen_set_domain_pte() is used nowhere in the kernel.
> Remove it.
>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

(+ Ingo and Steven who are maintainers of include/trace/events/xen.h)

> ---
>  arch/x86/include/asm/xen/page.h |  2 --
>  arch/x86/xen/mmu_pv.c           | 20 --------------------
>  include/trace/events/xen.h      | 18 ------------------
>  3 files changed, 40 deletions(-)
>
> diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
> index 497f7d28c1d6..07b6531813c4 100644
> --- a/arch/x86/include/asm/xen/page.h
> +++ b/arch/x86/include/asm/xen/page.h
> @@ -314,8 +314,6 @@ static inline pte_t __pte_ma(pteval_t x)
>  #define p4d_val_ma(x)	((x).p4d)
>  #endif
>  
> -void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid);
> -
>  xmaddr_t arbitrary_virt_to_machine(void *address);
>  unsigned long arbitrary_virt_to_mfn(void *vaddr);
>  void make_lowmem_page_readonly(void *vaddr);
> diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c
> index cab28cf2cffb..0422ee7e70b3 100644
> --- a/arch/x86/xen/mmu_pv.c
> +++ b/arch/x86/xen/mmu_pv.c
> @@ -162,26 +162,6 @@ static bool xen_page_pinned(void *ptr)
>  	return PagePinned(page);
>  }
>  
> -void xen_set_domain_pte(pte_t *ptep, pte_t pteval, unsigned domid)
> -{
> -	struct multicall_space mcs;
> -	struct mmu_update *u;
> -
> -	trace_xen_mmu_set_domain_pte(ptep, pteval, domid);
> -
> -	mcs = xen_mc_entry(sizeof(*u));
> -	u = mcs.args;
> -
> -	/* ptep might be kmapped when using 32-bit HIGHPTE */
> -	u->ptr = virt_to_machine(ptep).maddr;
> -	u->val = pte_val_ma(pteval);
> -
> -	MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, domid);
> -
> -	xen_mc_issue(PARAVIRT_LAZY_MMU);
> -}
> -EXPORT_SYMBOL_GPL(xen_set_domain_pte);
> -
>  static void xen_extend_mmu_update(const struct mmu_update *update)
>  {
>  	struct multicall_space mcs;
> diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
> index b70a38b7fa84..677e8ac2bb81 100644
> --- a/include/trace/events/xen.h
> +++ b/include/trace/events/xen.h
> @@ -149,24 +149,6 @@ DECLARE_EVENT_CLASS(xen_mmu__set_pte,
>  DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte);
>  DEFINE_XEN_MMU_SET_PTE(xen_mmu_set_pte_atomic);
>  
> -TRACE_EVENT(xen_mmu_set_domain_pte,
> -	    TP_PROTO(pte_t *ptep, pte_t pteval, unsigned domid),
> -	    TP_ARGS(ptep, pteval, domid),
> -	    TP_STRUCT__entry(
> -		    __field(pte_t *, ptep)
> -		    __field(pteval_t, pteval)
> -		    __field(unsigned, domid)
> -		    ),
> -	    TP_fast_assign(__entry->ptep = ptep;
> -			   __entry->pteval = pteval.pte;
> -			   __entry->domid = domid),
> -	    TP_printk("ptep %p pteval %0*llx (raw %0*llx) domid %u",
> -		      __entry->ptep,
> -		      (int)sizeof(pteval_t) * 2, (unsigned long long)pte_val(native_make_pte(__entry->pteval)),
> -		      (int)sizeof(pteval_t) * 2, (unsigned long long)__entry->pteval,
> -		      __entry->domid)
> -	);
> -
>  TRACE_EVENT(xen_mmu_set_pte_at,
>  	    TP_PROTO(struct mm_struct *mm, unsigned long addr,
>  		     pte_t *ptep, pte_t pteval),