linux-kernel - Re: [PATCH] KVM: x86/mmu: Add '__func__' in rmap

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Date:   Wed, 27 Jan 2021 11:54:34 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Stephen Zhang <stephenzhangzsd@...il.com>, seanjc@...gle.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86/mmu: Add '__func__' in rmap_printk()

On 27/01/21 03:08, Stephen Zhang wrote:
> Given the common pattern:
> 
> rmap_printk("%s:"..., __func__,...)
> 
> we could improve this by adding '__func__' in rmap_printk().
> 
> Signed-off-by: Stephen Zhang <stephenzhangzsd@...il.com>
> ---
>   arch/x86/kvm/mmu/mmu.c          | 20 ++++++++++----------
>   arch/x86/kvm/mmu/mmu_internal.h |  2 +-
>   2 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index 6d16481..1460705 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -844,17 +844,17 @@ static int pte_list_add(struct kvm_vcpu *vcpu, u64 *spte,
>   	int i, count = 0;
>   
>   	if (!rmap_head->val) {
> -		rmap_printk("pte_list_add: %p %llx 0->1\n", spte, *spte);
> +		rmap_printk("%p %llx 0->1\n", spte, *spte);
>   		rmap_head->val = (unsigned long)spte;
>   	} else if (!(rmap_head->val & 1)) {
> -		rmap_printk("pte_list_add: %p %llx 1->many\n", spte, *spte);
> +		rmap_printk("%p %llx 1->many\n", spte, *spte);
>   		desc = mmu_alloc_pte_list_desc(vcpu);
>   		desc->sptes[0] = (u64 *)rmap_head->val;
>   		desc->sptes[1] = spte;
>   		rmap_head->val = (unsigned long)desc | 1;
>   		++count;
>   	} else {
> -		rmap_printk("pte_list_add: %p %llx many->many\n", spte, *spte);
> +		rmap_printk("%p %llx many->many\n", spte, *spte);
>   		desc = (struct pte_list_desc *)(rmap_head->val & ~1ul);
>   		while (desc->sptes[PTE_LIST_EXT-1]) {
>   			count += PTE_LIST_EXT;
> @@ -906,14 +906,14 @@ static void __pte_list_remove(u64 *spte, struct kvm_rmap_head *rmap_head)
>   		pr_err("%s: %p 0->BUG\n", __func__, spte);
>   		BUG();
>   	} else if (!(rmap_head->val & 1)) {
> -		rmap_printk("%s:  %p 1->0\n", __func__, spte);
> +		rmap_printk("%p 1->0\n", spte);
>   		if ((u64 *)rmap_head->val != spte) {
>   			pr_err("%s:  %p 1->BUG\n", __func__, spte);
>   			BUG();
>   		}
>   		rmap_head->val = 0;
>   	} else {
> -		rmap_printk("%s:  %p many->many\n", __func__, spte);
> +		rmap_printk("%p many->many\n", spte);
>   		desc = (struct pte_list_desc *)(rmap_head->val & ~1ul);
>   		prev_desc = NULL;
>   		while (desc) {
> @@ -1115,7 +1115,7 @@ static bool spte_write_protect(u64 *sptep, bool pt_protect)
>   	      !(pt_protect && spte_can_locklessly_be_made_writable(spte)))
>   		return false;
>   
> -	rmap_printk("rmap_write_protect: spte %p %llx\n", sptep, *sptep);
> +	rmap_printk("spte %p %llx\n", sptep, *sptep);
>   
>   	if (pt_protect)
>   		spte &= ~SPTE_MMU_WRITEABLE;
> @@ -1142,7 +1142,7 @@ static bool spte_clear_dirty(u64 *sptep)
>   {
>   	u64 spte = *sptep;
>   
> -	rmap_printk("rmap_clear_dirty: spte %p %llx\n", sptep, *sptep);
> +	rmap_printk("spte %p %llx\n", sptep, *sptep);
>   
>   	MMU_WARN_ON(!spte_ad_enabled(spte));
>   	spte &= ~shadow_dirty_mask;
> @@ -1184,7 +1184,7 @@ static bool spte_set_dirty(u64 *sptep)
>   {
>   	u64 spte = *sptep;
>   
> -	rmap_printk("rmap_set_dirty: spte %p %llx\n", sptep, *sptep);
> +	rmap_printk("spte %p %llx\n", sptep, *sptep);
>   
>   	/*
>   	 * Similar to the !kvm_x86_ops.slot_disable_log_dirty case,
> @@ -1331,7 +1331,7 @@ static bool kvm_zap_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head)
>   	bool flush = false;
>   
>   	while ((sptep = rmap_get_first(rmap_head, &iter))) {
> -		rmap_printk("%s: spte %p %llx.\n", __func__, sptep, *sptep);
> +		rmap_printk("spte %p %llx.\n", sptep, *sptep);
>   
>   		pte_list_remove(rmap_head, sptep);
>   		flush = true;
> @@ -1363,7 +1363,7 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
>   
>   restart:
>   	for_each_rmap_spte(rmap_head, &iter, sptep) {
> -		rmap_printk("kvm_set_pte_rmapp: spte %p %llx gfn %llx (%d)\n",
> +		rmap_printk("spte %p %llx gfn %llx (%d)\n",
>   			    sptep, *sptep, gfn, level);
>   
>   		need_flush = 1;
> diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
> index bfc6389..5ec15e4 100644
> --- a/arch/x86/kvm/mmu/mmu_internal.h
> +++ b/arch/x86/kvm/mmu/mmu_internal.h
> @@ -12,7 +12,7 @@
>   extern bool dbg;
>   
>   #define pgprintk(x...) do { if (dbg) printk(x); } while (0)
> -#define rmap_printk(x...) do { if (dbg) printk(x); } while (0)
> +#define rmap_printk(fmt, args...) do { if (dbg) printk("%s: " fmt, __func__, ## args); } while (0)
>   #define MMU_WARN_ON(x) WARN_ON(x)
>   #else
>   #define pgprintk(x...) do { } while (0)
> 

Queued, thanks.

Paolo