From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: + mm-introduce-fault_flag_default.patch added to -mm tree Date: Mon, 09 Mar 2020 20:38:56 -0700 Message-ID: <20200310033856.cUU1ExYT7%akpm@linux-foundation.org> References: <20200305222751.6d781a3f2802d79510941e4e@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:52790 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726195AbgCJDjB (ORCPT ); Mon, 9 Mar 2020 23:39:01 -0400 In-Reply-To: <20200305222751.6d781a3f2802d79510941e4e@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: aarcange@redhat.com, bgeffon@google.com, bobbypowers@gmail.com, cracauer@cons.org, david@redhat.com, dgilbert@redhat.com, dplotnikov@virtuozzo.com, gokhale2@llnl.gov, hannes@cmpxchg.org, hughd@google.com, jglisse@redhat.com, kirill@shutemov.name, mcfadden8@llnl.gov, mgorman@suse.de, mike.kravetz@oracle.com, mm-commits@vger.kernel.org, peterx@redhat.com, rppt@linux.vnet.ibm.com, torvalds@linux-foundation.org, willy@infradead.org, xemul@virtuozzo.com The patch titled Subject: mm: introduce FAULT_FLAG_DEFAULT has been added to the -mm tree. Its filename is mm-introduce-fault_flag_default.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-fault_flag_default.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-fault_flag_default.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Peter Xu Subject: mm: introduce FAULT_FLAG_DEFAULT Although there're tons of arch-specific page fault handlers, most of them are still sharing the same initial value of the page fault flags. Say, merely all of the page fault handlers would allow the fault to be retried, and they also allow the fault to respond to SIGKILL. Let's define a default value for the fault flags to replace those initial page fault flags that were copied over. With this, it'll be far easier to introduce new fault flag that can be used by all the architectures instead of touching all the archs. Link: http://lkml.kernel.org/r/20200220160238.9694-1-peterx@redhat.com Signed-off-by: Peter Xu Reviewed-by: David Hildenbrand Cc: Andrea Arcangeli Cc: Bobby Powers Cc: Brian Geffon Cc: Denis Plotnikov Cc: "Dr . David Alan Gilbert" Cc: Hugh Dickins Cc: Jerome Glisse Cc: Johannes Weiner Cc: "Kirill A . Shutemov" Cc: Linus Torvalds Cc: Martin Cracauer Cc: Marty McFadden Cc: Matthew Wilcox Cc: Maya Gokhale Cc: Mel Gorman Cc: Mike Kravetz Cc: Mike Rapoport Cc: Pavel Emelyanov Signed-off-by: Andrew Morton --- arch/alpha/mm/fault.c | 2 +- arch/arc/mm/fault.c | 2 +- arch/arm/mm/fault.c | 2 +- arch/arm64/mm/fault.c | 2 +- arch/hexagon/mm/vm_fault.c | 2 +- arch/ia64/mm/fault.c | 2 +- arch/m68k/mm/fault.c | 2 +- arch/microblaze/mm/fault.c | 2 +- arch/mips/mm/fault.c | 2 +- arch/nds32/mm/fault.c | 2 +- arch/nios2/mm/fault.c | 2 +- arch/openrisc/mm/fault.c | 2 +- arch/parisc/mm/fault.c | 2 +- arch/powerpc/mm/fault.c | 2 +- arch/riscv/mm/fault.c | 2 +- arch/s390/mm/fault.c | 2 +- arch/sh/mm/fault.c | 2 +- arch/sparc/mm/fault_32.c | 2 +- arch/sparc/mm/fault_64.c | 2 +- arch/um/kernel/trap.c | 2 +- arch/unicore32/mm/fault.c | 2 +- arch/x86/mm/fault.c | 2 +- arch/xtensa/mm/fault.c | 2 +- include/linux/mm.h | 7 +++++++ 24 files changed, 30 insertions(+), 23 deletions(-) --- a/arch/alpha/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/alpha/mm/fault.c @@ -89,7 +89,7 @@ do_page_fault(unsigned long address, uns const struct exception_table_entry *fixup; int si_code = SEGV_MAPERR; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; /* As of EV6, a load into $31/$f31 is a prefetch, and never faults (or is suppressed by the PALcode). Support that for older CPUs --- a/arch/arc/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/arc/mm/fault.c @@ -100,7 +100,7 @@ void do_page_fault(unsigned long address (regs->ecr_cause == ECR_C_PROTV_INST_FETCH)) exec = 1; - flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + flags = FAULT_FLAG_DEFAULT; if (user_mode(regs)) flags |= FAULT_FLAG_USER; if (write) --- a/arch/arm64/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/arm64/mm/fault.c @@ -446,7 +446,7 @@ static int __kprobes do_page_fault(unsig struct mm_struct *mm = current->mm; vm_fault_t fault, major = 0; unsigned long vm_flags = VM_READ | VM_WRITE | VM_EXEC; - unsigned int mm_flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int mm_flags = FAULT_FLAG_DEFAULT; if (kprobe_page_fault(regs, esr)) return 0; --- a/arch/arm/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/arm/mm/fault.c @@ -241,7 +241,7 @@ do_page_fault(unsigned long addr, unsign struct mm_struct *mm; int sig, code; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; if (kprobe_page_fault(regs, fsr)) return 0; --- a/arch/hexagon/mm/vm_fault.c~mm-introduce-fault_flag_default +++ a/arch/hexagon/mm/vm_fault.c @@ -41,7 +41,7 @@ void do_page_fault(unsigned long address int si_code = SEGV_MAPERR; vm_fault_t fault; const struct exception_table_entry *fixup; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; /* * If we're in an interrupt or have no user context, --- a/arch/ia64/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/ia64/mm/fault.c @@ -65,7 +65,7 @@ ia64_do_page_fault (unsigned long addres struct mm_struct *mm = current->mm; unsigned long mask; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; mask = ((((isr >> IA64_ISR_X_BIT) & 1UL) << VM_EXEC_BIT) | (((isr >> IA64_ISR_W_BIT) & 1UL) << VM_WRITE_BIT)); --- a/arch/m68k/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/m68k/mm/fault.c @@ -71,7 +71,7 @@ int do_page_fault(struct pt_regs *regs, struct mm_struct *mm = current->mm; struct vm_area_struct * vma; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; pr_debug("do page fault:\nregs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld, %p\n", regs->sr, regs->pc, address, error_code, mm ? mm->pgd : NULL); --- a/arch/microblaze/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/microblaze/mm/fault.c @@ -91,7 +91,7 @@ void do_page_fault(struct pt_regs *regs, int code = SEGV_MAPERR; int is_write = error_code & ESR_S; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; regs->ear = address; regs->esr = error_code; --- a/arch/mips/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/mips/mm/fault.c @@ -44,7 +44,7 @@ static void __kprobes __do_page_fault(st const int field = sizeof(unsigned long) * 2; int si_code; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; static DEFINE_RATELIMIT_STATE(ratelimit_state, 5 * HZ, 10); --- a/arch/nds32/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/nds32/mm/fault.c @@ -80,7 +80,7 @@ void do_page_fault(unsigned long entry, int si_code; vm_fault_t fault; unsigned int mask = VM_READ | VM_WRITE | VM_EXEC; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; error_code = error_code & (ITYPE_mskINST | ITYPE_mskETYPE); tsk = current; --- a/arch/nios2/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/nios2/mm/fault.c @@ -47,7 +47,7 @@ asmlinkage void do_page_fault(struct pt_ struct mm_struct *mm = tsk->mm; int code = SEGV_MAPERR; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; cause >>= 2; --- a/arch/openrisc/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/openrisc/mm/fault.c @@ -50,7 +50,7 @@ asmlinkage void do_page_fault(struct pt_ struct vm_area_struct *vma; int si_code; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; tsk = current; --- a/arch/parisc/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/parisc/mm/fault.c @@ -274,7 +274,7 @@ void do_page_fault(struct pt_regs *regs, if (!mm) goto no_context; - flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + flags = FAULT_FLAG_DEFAULT; if (user_mode(regs)) flags |= FAULT_FLAG_USER; --- a/arch/powerpc/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/powerpc/mm/fault.c @@ -434,7 +434,7 @@ static int __do_page_fault(struct pt_reg { struct vm_area_struct * vma; struct mm_struct *mm = current->mm; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; int is_exec = TRAP(regs) == 0x400; int is_user = user_mode(regs); int is_write = page_fault_is_write(error_code); --- a/arch/riscv/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/riscv/mm/fault.c @@ -30,7 +30,7 @@ asmlinkage void do_page_fault(struct pt_ struct vm_area_struct *vma; struct mm_struct *mm; unsigned long addr, cause; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; int code = SEGV_MAPERR; vm_fault_t fault; --- a/arch/s390/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/s390/mm/fault.c @@ -429,7 +429,7 @@ static inline vm_fault_t do_exception(st address = trans_exc_code & __FAIL_ADDR_MASK; perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, address); - flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + flags = FAULT_FLAG_DEFAULT; if (user_mode(regs)) flags |= FAULT_FLAG_USER; if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400) --- a/arch/sh/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/sh/mm/fault.c @@ -380,7 +380,7 @@ asmlinkage void __kprobes do_page_fault( struct mm_struct *mm; struct vm_area_struct * vma; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; tsk = current; mm = tsk->mm; --- a/arch/sparc/mm/fault_32.c~mm-introduce-fault_flag_default +++ a/arch/sparc/mm/fault_32.c @@ -168,7 +168,7 @@ asmlinkage void do_sparc_fault(struct pt int from_user = !(regs->psr & PSR_PS); int code; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; if (text_fault) address = regs->pc; --- a/arch/sparc/mm/fault_64.c~mm-introduce-fault_flag_default +++ a/arch/sparc/mm/fault_64.c @@ -271,7 +271,7 @@ asmlinkage void __kprobes do_sparc64_fau int si_code, fault_code; vm_fault_t fault; unsigned long address, mm_rss; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; fault_code = get_thread_fault_code(); --- a/arch/um/kernel/trap.c~mm-introduce-fault_flag_default +++ a/arch/um/kernel/trap.c @@ -33,7 +33,7 @@ int handle_page_fault(unsigned long addr pmd_t *pmd; pte_t *pte; int err = -EFAULT; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; *code_out = SEGV_MAPERR; --- a/arch/unicore32/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/unicore32/mm/fault.c @@ -202,7 +202,7 @@ static int do_pf(unsigned long addr, uns struct mm_struct *mm; int sig, code; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; tsk = current; mm = tsk->mm; --- a/arch/x86/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/x86/mm/fault.c @@ -1310,7 +1310,7 @@ void do_user_addr_fault(struct pt_regs * struct task_struct *tsk; struct mm_struct *mm; vm_fault_t fault, major = 0; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; tsk = current; mm = tsk->mm; --- a/arch/xtensa/mm/fault.c~mm-introduce-fault_flag_default +++ a/arch/xtensa/mm/fault.c @@ -43,7 +43,7 @@ void do_page_fault(struct pt_regs *regs) int is_write, is_exec; vm_fault_t fault; - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + unsigned int flags = FAULT_FLAG_DEFAULT; code = SEGV_MAPERR; --- a/include/linux/mm.h~mm-introduce-fault_flag_default +++ a/include/linux/mm.h @@ -391,6 +391,13 @@ extern pgprot_t protection_map[16]; #define FAULT_FLAG_REMOTE 0x80 /* faulting for non current tsk/mm */ #define FAULT_FLAG_INSTRUCTION 0x100 /* The fault was during an instruction fetch */ +/* + * The default fault flags that should be used by most of the + * arch-specific page fault handlers. + */ +#define FAULT_FLAG_DEFAULT (FAULT_FLAG_ALLOW_RETRY | \ + FAULT_FLAG_KILLABLE) + #define FAULT_FLAG_TRACE \ { FAULT_FLAG_WRITE, "WRITE" }, \ { FAULT_FLAG_MKWRITE, "MKWRITE" }, \ _ Patches currently in -mm which might be from peterx@redhat.com are mm-gup-rename-nonblocking-to-locked-where-proper.patch mm-gup-fix-__get_user_pages-on-fault-retry-of-hugetlb.patch mm-introduce-fault_signal_pending.patch x86-mm-use-helper-fault_signal_pending.patch arc-mm-use-helper-fault_signal_pending.patch arm64-mm-use-helper-fault_signal_pending.patch powerpc-mm-use-helper-fault_signal_pending.patch sh-mm-use-helper-fault_signal_pending.patch mm-return-faster-for-non-fatal-signals-in-user-mode-faults.patch userfaultfd-dont-retake-mmap_sem-to-emulate-nopage.patch mm-introduce-fault_flag_default.patch mm-introduce-fault_flag_interruptible.patch mm-allow-vm_fault_retry-for-multiple-times.patch mm-gup-allow-vm_fault_retry-for-multiple-times.patch mm-gup-allow-to-react-to-fatal-signals.patch mm-userfaultfd-honor-fault_flag_killable-in-fault-path.patch mm-merge-parameters-for-change_protection.patch userfaultfd-wp-apply-_page_uffd_wp-bit.patch userfaultfd-wp-drop-_page_uffd_wp-properly-when-fork.patch userfaultfd-wp-add-pmd_swp_uffd_wp-helpers.patch userfaultfd-wp-support-swap-and-page-migration.patch khugepaged-skip-collapse-if-uffd-wp-detected.patch userfaultfd-wp-dont-wake-up-when-doing-write-protect.patch userfaultfd-wp-declare-_uffdio_writeprotect-conditionally.patch userfaultfd-selftests-refactor-statistics.patch userfaultfd-selftests-add-write-protect-test.patch