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Peter Anvin" , , , , , , , Kefeng Wang Subject: [PATCH rfc v2 05/10] powerpc: mm: use try_vma_locked_page_fault() Date: Mon, 21 Aug 2023 20:30:51 +0800 Message-ID: <20230821123056.2109942-6-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20230821123056.2109942-1-wangkefeng.wang@huawei.com> References: <20230821123056.2109942-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemm100001.china.huawei.com (7.185.36.93) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Use new try_vma_locked_page_fault() helper to simplify code. No functional change intended. Signed-off-by: Kefeng Wang --- arch/powerpc/mm/fault.c | 66 ++++++++++++++++++++--------------------- 1 file changed, 32 insertions(+), 34 deletions(-) diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index b1723094d464..52f9546e020e 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -391,6 +391,22 @@ static int page_fault_is_bad(unsigned long err) #define page_fault_is_bad(__err) ((__err) & DSISR_BAD_FAULT_32S) #endif =20 +#ifdef CONFIG_PER_VMA_LOCK +bool arch_vma_access_error(struct vm_area_struct *vma, struct vm_fault *vm= f) +{ + int is_exec =3D TRAP(vmf->regs) =3D=3D INTERRUPT_INST_STORAGE; + int is_write =3D page_fault_is_write(vmf->fault_code); + + if (unlikely(access_pkey_error(is_write, is_exec, + (vmf->fault_code & DSISR_KEYFAULT), vma))) + return true; + + if (unlikely(access_error(is_write, is_exec, vma))) + return true; + return false; +} +#endif + /* * For 600- and 800-family processors, the error_code parameter is DSISR * for a data fault, SRR1 for an instruction fault. @@ -407,12 +423,18 @@ static int ___do_page_fault(struct pt_regs *regs, uns= igned long address, { struct vm_area_struct * vma; struct mm_struct *mm =3D current->mm; - unsigned int flags =3D FAULT_FLAG_DEFAULT; int is_exec =3D TRAP(regs) =3D=3D INTERRUPT_INST_STORAGE; int is_user =3D user_mode(regs); int is_write =3D page_fault_is_write(error_code); vm_fault_t fault, major =3D 0; bool kprobe_fault =3D kprobe_page_fault(regs, 11); + struct vm_fault vmf =3D { + .real_address =3D address, + .fault_code =3D error_code, + .regs =3D regs, + .flags =3D FAULT_FLAG_DEFAULT, + }; + =20 if (unlikely(debugger_fault_handler(regs) || kprobe_fault)) return 0; @@ -463,45 +485,21 @@ static int ___do_page_fault(struct pt_regs *regs, uns= igned long address, * mmap_lock held */ if (is_user) - flags |=3D FAULT_FLAG_USER; + vmf.flags |=3D FAULT_FLAG_USER; if (is_write) - flags |=3D FAULT_FLAG_WRITE; + vmf.flags |=3D FAULT_FLAG_WRITE; if (is_exec) - flags |=3D FAULT_FLAG_INSTRUCTION; + vmf.flags |=3D FAULT_FLAG_INSTRUCTION; =20 - if (!(flags & FAULT_FLAG_USER)) - goto lock_mmap; - - vma =3D lock_vma_under_rcu(mm, address); - if (!vma) - goto lock_mmap; - - if (unlikely(access_pkey_error(is_write, is_exec, - (error_code & DSISR_KEYFAULT), vma))) { - vma_end_read(vma); - goto lock_mmap; - } - - if (unlikely(access_error(is_write, is_exec, vma))) { - vma_end_read(vma); - goto lock_mmap; - } - - fault =3D handle_mm_fault(vma, address, flags | FAULT_FLAG_VMA_LOCK, regs= ); - if (!(fault & (VM_FAULT_RETRY | VM_FAULT_COMPLETED))) - vma_end_read(vma); - - if (!(fault & VM_FAULT_RETRY)) { - count_vm_vma_lock_event(VMA_LOCK_SUCCESS); + fault =3D try_vma_locked_page_fault(&vmf); + if (fault =3D=3D VM_FAULT_NONE) + goto retry; + if (!(fault & VM_FAULT_RETRY)) goto done; - } - count_vm_vma_lock_event(VMA_LOCK_RETRY); =20 if (fault_signal_pending(fault, regs)) return user_mode(regs) ? 0 : SIGBUS; =20 -lock_mmap: - /* When running in the kernel we expect faults to occur only to * addresses in user space. All other faults represent errors in the * kernel and should generate an OOPS. Unfortunately, in the case of an @@ -528,7 +526,7 @@ static int ___do_page_fault(struct pt_regs *regs, unsig= ned long address, * make sure we exit gracefully rather than endlessly redo * the fault. */ - fault =3D handle_mm_fault(vma, address, flags, regs); + fault =3D handle_mm_fault(vma, address, vmf.flags, regs); =20 major |=3D fault & VM_FAULT_MAJOR; =20 @@ -544,7 +542,7 @@ static int ___do_page_fault(struct pt_regs *regs, unsig= ned long address, * case. */ if (unlikely(fault & VM_FAULT_RETRY)) { - flags |=3D FAULT_FLAG_TRIED; + vmf.flags |=3D FAULT_FLAG_TRIED; goto retry; } =20 --=20 2.27.0