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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 09:54:46 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-06-09 09:54:46 -0700 |
commit | a5ad5742f671de906adbf29fbedf0a04705cebad (patch) | |
tree | 88d1a4c18e2025a5a8335dbbc9dea8bebeba5789 /arch/s390/mm/fault.c | |
parent | 013b2deba9a6b80ca02f4fafd7dedf875e9b4450 (diff) | |
parent | 4fa7252338a56fbc90220e6330f136a379175a7a (diff) | |
download | linux-a5ad5742f671de906adbf29fbedf0a04705cebad.tar.gz linux-a5ad5742f671de906adbf29fbedf0a04705cebad.tar.bz2 linux-a5ad5742f671de906adbf29fbedf0a04705cebad.zip |
Merge branch 'akpm' (patches from Andrew)
Merge even more updates from Andrew Morton:
- a kernel-wide sweep of show_stack()
- pagetable cleanups
- abstract out accesses to mmap_sem - prep for mmap_sem scalability work
- hch's user acess work
Subsystems affected by this patch series: debug, mm/pagemap, mm/maccess,
mm/documentation.
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (93 commits)
include/linux/cache.h: expand documentation over __read_mostly
maccess: return -ERANGE when probe_kernel_read() fails
x86: use non-set_fs based maccess routines
maccess: allow architectures to provide kernel probing directly
maccess: move user access routines together
maccess: always use strict semantics for probe_kernel_read
maccess: remove strncpy_from_unsafe
tracing/kprobes: handle mixed kernel/userspace probes better
bpf: rework the compat kernel probe handling
bpf:bpf_seq_printf(): handle potentially unsafe format string better
bpf: handle the compat string in bpf_trace_copy_string better
bpf: factor out a bpf_trace_copy_string helper
maccess: unify the probe kernel arch hooks
maccess: remove probe_read_common and probe_write_common
maccess: rename strnlen_unsafe_user to strnlen_user_nofault
maccess: rename strncpy_from_unsafe_strict to strncpy_from_kernel_nofault
maccess: rename strncpy_from_unsafe_user to strncpy_from_user_nofault
maccess: update the top of file comment
maccess: clarify kerneldoc comments
maccess: remove duplicate kerneldoc comments
...
Diffstat (limited to 'arch/s390/mm/fault.c')
-rw-r--r-- | arch/s390/mm/fault.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index dedc28be27ab..6a24751557f0 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -33,7 +33,6 @@ #include <linux/hugetlb.h> #include <asm/asm-offsets.h> #include <asm/diag.h> -#include <asm/pgtable.h> #include <asm/gmap.h> #include <asm/irq.h> #include <asm/mmu_context.h> @@ -434,7 +433,7 @@ static inline vm_fault_t do_exception(struct pt_regs *regs, int access) flags |= FAULT_FLAG_USER; if (access == VM_WRITE || (trans_exc_code & store_indication) == 0x400) flags |= FAULT_FLAG_WRITE; - down_read(&mm->mmap_sem); + mmap_read_lock(mm); gmap = NULL; if (IS_ENABLED(CONFIG_PGSTE) && type == GMAP_FAULT) { @@ -508,14 +507,14 @@ retry: if (IS_ENABLED(CONFIG_PGSTE) && gmap && (flags & FAULT_FLAG_RETRY_NOWAIT)) { /* FAULT_FLAG_RETRY_NOWAIT has been set, - * mmap_sem has not been released */ + * mmap_lock has not been released */ current->thread.gmap_pfault = 1; fault = VM_FAULT_PFAULT; goto out_up; } flags &= ~FAULT_FLAG_RETRY_NOWAIT; flags |= FAULT_FLAG_TRIED; - down_read(&mm->mmap_sem); + mmap_read_lock(mm); goto retry; } } @@ -533,7 +532,7 @@ retry: } fault = 0; out_up: - up_read(&mm->mmap_sem); + mmap_read_unlock(mm); out: return fault; } @@ -825,22 +824,22 @@ void do_secure_storage_access(struct pt_regs *regs) switch (get_fault_type(regs)) { case USER_FAULT: mm = current->mm; - down_read(&mm->mmap_sem); + mmap_read_lock(mm); vma = find_vma(mm, addr); if (!vma) { - up_read(&mm->mmap_sem); + mmap_read_unlock(mm); do_fault_error(regs, VM_READ | VM_WRITE, VM_FAULT_BADMAP); break; } page = follow_page(vma, addr, FOLL_WRITE | FOLL_GET); if (IS_ERR_OR_NULL(page)) { - up_read(&mm->mmap_sem); + mmap_read_unlock(mm); break; } if (arch_make_page_accessible(page)) send_sig(SIGSEGV, current, 0); put_page(page); - up_read(&mm->mmap_sem); + mmap_read_unlock(mm); break; case KERNEL_FAULT: page = phys_to_page(addr); |