From patchwork Tue May 16 09:26:21 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Aneesh Kumar K.V" X-Patchwork-Id: 762866 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3wRsrl0LHbz9s7k for ; Tue, 16 May 2017 19:40:55 +1000 (AEST) Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 3wRsrk6fNvzDr3r for ; Tue, 16 May 2017 19:40:54 +1000 (AEST) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3wRsXL27XgzDqj8 for ; Tue, 16 May 2017 19:26:42 +1000 (AEST) Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v4G9NnLW133596 for ; Tue, 16 May 2017 05:26:35 -0400 Received: from e32.co.us.ibm.com (e32.co.us.ibm.com [32.97.110.150]) by mx0a-001b2d01.pphosted.com with ESMTP id 2afwhj3nh5-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 16 May 2017 05:26:35 -0400 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Tue, 16 May 2017 03:26:31 -0600 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp07028.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v4G9QVtw11731390; Tue, 16 May 2017 02:26:31 -0700 Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F2CF8BE03A; Tue, 16 May 2017 03:26:30 -0600 (MDT) Received: from skywalker.in.ibm.com (unknown [9.124.35.179]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP id 33B88BE03B; Tue, 16 May 2017 03:26:28 -0600 (MDT) From: "Aneesh Kumar K.V" To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au, Frederic Barrat Subject: [PATCH 2/3] powerpc/mm: Rename find_linux_pte_or_hugepte Date: Tue, 16 May 2017 14:56:21 +0530 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1494926782-25700-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1494926782-25700-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17051609-0004-0000-0000-000012281D9E X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00007071; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000212; SDB=6.00861193; UDB=6.00427113; IPR=6.00640856; BA=6.00005351; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00015478; XFM=3.00000015; UTC=2017-05-16 09:26:33 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17051609-0005-0000-0000-00007F4E966F Message-Id: <1494926782-25700-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-05-16_03:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1703280000 definitions=main-1705160083 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, "Aneesh Kumar K.V" Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" No functional change. Add newer helpers with addtional warnings and use those. --- arch/powerpc/include/asm/pgtable.h | 10 +-------- arch/powerpc/include/asm/pte-walk.h | 38 ++++++++++++++++++++++++++++++++++ arch/powerpc/kernel/eeh.c | 4 ++-- arch/powerpc/kernel/io-workarounds.c | 5 +++-- arch/powerpc/kvm/book3s_64_mmu_hv.c | 5 +++-- arch/powerpc/kvm/book3s_64_mmu_radix.c | 33 ++++++++++++++++------------- arch/powerpc/kvm/book3s_64_vio_hv.c | 3 ++- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 12 ++++------- arch/powerpc/kvm/e500_mmu_host.c | 3 ++- arch/powerpc/mm/hash_utils_64.c | 5 +++-- arch/powerpc/mm/hugetlbpage.c | 24 ++++++++++++--------- arch/powerpc/mm/tlb_hash64.c | 6 ++++-- arch/powerpc/perf/callchain.c | 3 ++- 13 files changed, 97 insertions(+), 54 deletions(-) create mode 100644 arch/powerpc/include/asm/pte-walk.h diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index dd01212935ac..9fa263ad7cb3 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -66,16 +66,8 @@ extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, #ifndef CONFIG_TRANSPARENT_HUGEPAGE #define pmd_large(pmd) 0 #endif -pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, - bool *is_thp, unsigned *shift); -static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, - bool *is_thp, unsigned *shift) -{ - VM_WARN(!arch_irqs_disabled(), - "%s called with irq enabled\n", __func__); - return __find_linux_pte_or_hugepte(pgdir, ea, is_thp, shift); -} +/* can we use this in kvm */ unsigned long vmalloc_to_phys(void *vmalloc_addr); void pgtable_cache_add(unsigned shift, void (*ctor)(void *)); diff --git a/arch/powerpc/include/asm/pte-walk.h b/arch/powerpc/include/asm/pte-walk.h new file mode 100644 index 000000000000..ea30c4ddd211 --- /dev/null +++ b/arch/powerpc/include/asm/pte-walk.h @@ -0,0 +1,38 @@ +#ifndef _ASM_POWERPC_PTE_WALK_H +#define _ASM_POWERPC_PTE_WALK_H + +#ifndef __ASSEMBLY__ +#include + +/* Don't use this directly */ +extern pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, + bool *is_thp, unsigned *hshift); + +static inline pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea, + bool *is_thp, unsigned *hshift) +{ + VM_WARN((!arch_irqs_disabled() && !__hard_irqs_disabled()) , + "%s called with irq enabled\n", __func__); + return __find_linux_pte(pgdir, ea, is_thp, hshift); +} + +static inline pte_t *find_init_mm_pte(unsigned long ea, unsigned *hshift) +{ + pgd_t *pgdir = init_mm.pgd; + return __find_linux_pte(pgdir, ea, NULL, hshift); +} +/* + * This is what we should always use. Any other lockless page table lookup needs + * careful audit against THP split. + */ +static inline pte_t *find_current_mm_pte(pgd_t *pgdir, unsigned long ea, + bool *is_thp, unsigned *hshift) +{ + VM_WARN((!arch_irqs_disabled() && !__hard_irqs_disabled()) , + "%s called with irq enabled\n", __func__); + VM_WARN(pgdir != current->mm->pgd, + "%s lock less page table lookup called on wrong mm\n", __func__); + return __find_linux_pte(pgdir, ea, is_thp, hshift); +} +#endif +#endif diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 63992b2d8e15..5e6887c40528 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -44,6 +44,7 @@ #include #include #include +#include /** Overview: @@ -352,8 +353,7 @@ static inline unsigned long eeh_token_to_phys(unsigned long token) * worried about _PAGE_SPLITTING/collapse. Also we will not hit * page table free, because of init_mm. */ - ptep = __find_linux_pte_or_hugepte(init_mm.pgd, token, - NULL, &hugepage_shift); + ptep = find_init_mm_pte(token, &hugepage_shift); if (!ptep) return token; WARN_ON(hugepage_shift); diff --git a/arch/powerpc/kernel/io-workarounds.c b/arch/powerpc/kernel/io-workarounds.c index a582e0d42525..bbe85f5aea71 100644 --- a/arch/powerpc/kernel/io-workarounds.c +++ b/arch/powerpc/kernel/io-workarounds.c @@ -19,6 +19,8 @@ #include #include #include +#include + #define IOWA_MAX_BUS 8 @@ -75,8 +77,7 @@ struct iowa_bus *iowa_mem_find_bus(const PCI_IO_ADDR addr) * We won't find huge pages here (iomem). Also can't hit * a page table free due to init_mm */ - ptep = __find_linux_pte_or_hugepte(init_mm.pgd, vaddr, - NULL, &hugepage_shift); + ptep = find_init_mm_pte(vaddr, &hugepage_shift); if (ptep == NULL) paddr = 0; else { diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 8c68145ba1bd..f8f60f5e3aca 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -37,6 +37,7 @@ #include #include #include +#include #include "trace_hv.h" @@ -597,8 +598,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, * hugepage split and collapse. */ local_irq_save(flags); - ptep = find_linux_pte_or_hugepte(current->mm->pgd, - hva, NULL, NULL); + ptep = find_current_mm_pte(current->mm->pgd, + hva, NULL, NULL); if (ptep) { pte = kvmppc_read_update_linux_pte(ptep, 1); if (__pte_write(pte)) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index f6b3e67c5762..dcd9e975c3d3 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -17,6 +17,7 @@ #include #include #include +#include /* * Supported radix tree geometry. @@ -359,8 +360,7 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, if (writing) pgflags |= _PAGE_DIRTY; local_irq_save(flags); - ptep = __find_linux_pte_or_hugepte(current->mm->pgd, hva, - NULL, NULL); + ptep = find_current_mm_pte(current->mm->pgd, hva, NULL, NULL); if (ptep) { pte = READ_ONCE(*ptep); if (pte_present(pte) && @@ -374,8 +374,16 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, spin_unlock(&kvm->mmu_lock); return RESUME_GUEST; } - ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, - gpa, NULL, &shift); + /* + * it is ok to do the lookup with arch.pgtable here, because + * we are doing this on secondary cpus and current task there + * is not the hypervisor. Also this is safe against THP in the + * host, because an IPI to primary thread will wait for the secondary + * to exit which will agains result in the below page table walk + * to finish. + */ + ptep = find_linux_pte(kvm->arch.pgtable, + gpa, NULL, &shift); if (ptep && pte_present(*ptep)) { kvmppc_radix_update_pte(kvm, ptep, 0, pgflags, gpa, shift); @@ -427,8 +435,8 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, pgflags |= _PAGE_WRITE; } else { local_irq_save(flags); - ptep = __find_linux_pte_or_hugepte(current->mm->pgd, - hva, NULL, NULL); + ptep = find_current_mm_pte(current->mm->pgd, + hva, NULL, NULL); if (ptep && pte_write(*ptep) && pte_dirty(*ptep)) pgflags |= _PAGE_WRITE; local_irq_restore(flags); @@ -499,8 +507,8 @@ int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned int shift; unsigned long old; - ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa, - NULL, &shift); + /* is that safe ? */ + ptep = find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift); if (ptep && pte_present(*ptep)) { old = kvmppc_radix_update_pte(kvm, ptep, _PAGE_PRESENT, 0, gpa, shift); @@ -525,8 +533,7 @@ int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned int shift; int ref = 0; - ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa, - NULL, &shift); + ptep = find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift); if (ptep && pte_present(*ptep) && pte_young(*ptep)) { kvmppc_radix_update_pte(kvm, ptep, _PAGE_ACCESSED, 0, gpa, shift); @@ -545,8 +552,7 @@ int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot, unsigned int shift; int ref = 0; - ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa, - NULL, &shift); + ptep = find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift); if (ptep && pte_present(*ptep) && pte_young(*ptep)) ref = 1; return ref; @@ -562,8 +568,7 @@ static int kvm_radix_test_clear_dirty(struct kvm *kvm, unsigned int shift; int ret = 0; - ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa, - NULL, &shift); + ptep = find_linux_pte(kvm->arch.pgtable, gpa, NULL, &shift); if (ptep && pte_present(*ptep) && pte_dirty(*ptep)) { ret = 1; if (shift) diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c index e4c4ea973e57..2ac2c0daddff 100644 --- a/arch/powerpc/kvm/book3s_64_vio_hv.c +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c @@ -39,6 +39,7 @@ #include #include #include +#include #define TCES_PER_PAGE (PAGE_SIZE / sizeof(u64)) @@ -210,7 +211,7 @@ static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu, pte_t *ptep, pte; unsigned shift = 0; - ptep = __find_linux_pte_or_hugepte(vcpu->arch.pgdir, ua, NULL, &shift); + ptep = find_linux_pte(vcpu->arch.pgdir, ua, NULL, &shift); if (!ptep || !pte_present(*ptep)) return -ENXIO; pte = *ptep; diff --git a/arch/powerpc/kvm/book3s_hv_rm_mmu.c b/arch/powerpc/kvm/book3s_hv_rm_mmu.c index ce6f2121fffe..f8bfd947fe90 100644 --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -21,6 +21,7 @@ #include #include #include +#include /* Translate address of a vmalloc'd thing to a linear map address */ static void *real_vmalloc_addr(void *x) @@ -32,7 +33,7 @@ static void *real_vmalloc_addr(void *x) * So don't worry about THP collapse/split. Called * Only in realmode, hence won't need irq_save/restore. */ - p = __find_linux_pte_or_hugepte(swapper_pg_dir, addr, NULL, NULL); + p = find_init_mm_pte(addr, NULL); if (!p || !pte_present(*p)) return NULL; addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK); @@ -229,14 +230,9 @@ long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags, * If we had a page table table change after lookup, we would * retry via mmu_notifier_retry. */ - if (realmode) - ptep = __find_linux_pte_or_hugepte(pgdir, hva, NULL, - &hpage_shift); - else { + if (!realmode) local_irq_save(irq_flags); - ptep = find_linux_pte_or_hugepte(pgdir, hva, NULL, - &hpage_shift); - } + ptep = find_linux_pte(pgdir, hva, NULL, &hpage_shift); if (ptep) { pte_t pte; unsigned int host_pte_size; diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c index 0fda4230f6c0..3284b2c2c865 100644 --- a/arch/powerpc/kvm/e500_mmu_host.c +++ b/arch/powerpc/kvm/e500_mmu_host.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "e500.h" #include "timing.h" @@ -476,7 +477,7 @@ static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, * can't run hence pfn won't change. */ local_irq_save(flags); - ptep = find_linux_pte_or_hugepte(pgdir, hva, NULL, NULL); + ptep = find_linux_pte(pgdir, hva, NULL, NULL); if (ptep) { pte_t pte = READ_ONCE(*ptep); diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index f2095ce9d4b0..2e5e04933350 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -61,6 +61,7 @@ #include #include #include +#include #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) @@ -1295,7 +1296,7 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea, #endif /* CONFIG_PPC_64K_PAGES */ /* Get PTE and page size from page tables */ - ptep = __find_linux_pte_or_hugepte(pgdir, ea, &is_thp, &hugeshift); + ptep = find_linux_pte(pgdir, ea, &is_thp, &hugeshift); if (ptep == NULL || !pte_present(*ptep)) { DBG_LOW(" no PTE !\n"); rc = 1; @@ -1524,7 +1525,7 @@ void hash_preload(struct mm_struct *mm, unsigned long ea, * THP pages use update_mmu_cache_pmd. We don't do * hash preload there. Hence can ignore THP here */ - ptep = find_linux_pte_or_hugepte(pgdir, ea, NULL, &hugepage_shift); + ptep = find_current_mm_pte(pgdir, ea, NULL, &hugepage_shift); if (!ptep) goto out_exit; diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 4ebaa18f2495..a2ed4084e578 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -25,6 +25,8 @@ #include #include #include +#include + #ifdef CONFIG_HUGETLB_PAGE @@ -60,8 +62,11 @@ static unsigned nr_gpages; pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr) { - /* Only called for hugetlbfs pages, hence can ignore THP */ - return __find_linux_pte_or_hugepte(mm->pgd, addr, NULL, NULL); + /* + * Only called for hugetlbfs pages, hence can ignore THP and the + * irq disabled walk. + */ + return __find_linux_pte(mm->pgd, addr, NULL, NULL); } static int __hugepte_alloc(struct mm_struct *mm, hugepd_t *hpdp, @@ -963,9 +968,8 @@ void flush_dcache_icache_hugepage(struct page *page) * This function need to be called with interrupts disabled. We use this variant * when we have MSR[EE] = 0 but the paca->soft_enabled = 1 */ - -pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, - bool *is_thp, unsigned *shift) +pte_t *__find_linux_pte(pgd_t *pgdir, unsigned long ea, + bool *is_thp, unsigned *hpage_shift) { pgd_t pgd, *pgdp; pud_t pud, *pudp; @@ -974,8 +978,8 @@ pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, hugepd_t *hpdp = NULL; unsigned pdshift = PGDIR_SHIFT; - if (shift) - *shift = 0; + if (hpage_shift) + *hpage_shift = 0; if (is_thp) *is_thp = false; @@ -1045,11 +1049,11 @@ pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, ret_pte = hugepte_offset(*hpdp, ea, pdshift); pdshift = hugepd_shift(*hpdp); out: - if (shift) - *shift = pdshift; + if (hpage_shift) + *hpage_shift = pdshift; return ret_pte; } -EXPORT_SYMBOL_GPL(__find_linux_pte_or_hugepte); +EXPORT_SYMBOL_GPL(__find_linux_pte); int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, unsigned long end, int write, struct page **pages, int *nr) diff --git a/arch/powerpc/mm/tlb_hash64.c b/arch/powerpc/mm/tlb_hash64.c index 4517aa43a8b1..b3e6116b4317 100644 --- a/arch/powerpc/mm/tlb_hash64.c +++ b/arch/powerpc/mm/tlb_hash64.c @@ -29,6 +29,8 @@ #include #include #include +#include + #include @@ -209,8 +211,8 @@ void __flush_hash_table_range(struct mm_struct *mm, unsigned long start, local_irq_save(flags); arch_enter_lazy_mmu_mode(); for (; start < end; start += PAGE_SIZE) { - pte_t *ptep = find_linux_pte_or_hugepte(mm->pgd, start, &is_thp, - &hugepage_shift); + pte_t *ptep = find_current_mm_pte(mm->pgd, start, &is_thp, + &hugepage_shift); unsigned long pte; if (ptep == NULL) diff --git a/arch/powerpc/perf/callchain.c b/arch/powerpc/perf/callchain.c index 0fc26714780a..0af051a1974e 100644 --- a/arch/powerpc/perf/callchain.c +++ b/arch/powerpc/perf/callchain.c @@ -22,6 +22,7 @@ #ifdef CONFIG_PPC64 #include "../kernel/ppc32.h" #endif +#include /* @@ -127,7 +128,7 @@ static int read_user_stack_slow(void __user *ptr, void *buf, int nb) return -EFAULT; local_irq_save(flags); - ptep = find_linux_pte_or_hugepte(pgdir, addr, NULL, &shift); + ptep = find_current_mm_pte(pgdir, addr, NULL, &shift); if (!ptep) goto err_out; if (!shift)