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authorLinus Torvalds <torvalds@linux-foundation.org>2016-05-24 05:42:28 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-05-24 05:42:28 +0300
commit84787c572d402644dca4874aba73324d9f8e3948 (patch)
tree31783e50b09fee00ee7ff87c0c9708a3c7106482 /mm
parentd62a0234c87f1457a3d2ba519ef90cf164a5eb23 (diff)
parentc5d2cac0f1caaf7dd21350146fb29c55b3e74249 (diff)
downloadlinux-84787c572d402644dca4874aba73324d9f8e3948.tar.xz
Merge branch 'akpm' (patches from Andrew)
Merge yet more updates from Andrew Morton: - Oleg's "wait/ptrace: assume __WALL if the child is traced". It's a kernel-based workaround for existing userspace issues. - A few hotfixes - befs cleanups - nilfs2 updates - sys_wait() changes - kexec updates - kdump - scripts/gdb updates - the last of the MM queue - a few other misc things * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (84 commits) kgdb: depends on VT drm/amdgpu: make amdgpu_mn_get wait for mmap_sem killable drm/radeon: make radeon_mn_get wait for mmap_sem killable drm/i915: make i915_gem_mmap_ioctl wait for mmap_sem killable uprobes: wait for mmap_sem for write killable prctl: make PR_SET_THP_DISABLE wait for mmap_sem killable exec: make exec path waiting for mmap_sem killable aio: make aio_setup_ring killable coredump: make coredump_wait wait for mmap_sem for write killable vdso: make arch_setup_additional_pages wait for mmap_sem for write killable ipc, shm: make shmem attach/detach wait for mmap_sem killable mm, fork: make dup_mmap wait for mmap_sem for write killable mm, proc: make clear_refs killable mm: make vm_brk killable mm, elf: handle vm_brk error mm, aout: handle vm_brk failures mm: make vm_munmap killable mm: make vm_mmap killable mm: make mmap_sem for write waits killable for mm syscalls MAINTAINERS: add co-maintainer for scripts/gdb ...
Diffstat (limited to 'mm')
-rw-r--r--mm/internal.h2
-rw-r--r--mm/madvise.c8
-rw-r--r--mm/memcontrol.c2
-rw-r--r--mm/mlock.c16
-rw-r--r--mm/mmap.c24
-rw-r--r--mm/mprotect.c3
-rw-r--r--mm/mremap.c3
-rw-r--r--mm/util.c3
8 files changed, 42 insertions, 19 deletions
diff --git a/mm/internal.h b/mm/internal.h
index f6f3353b0868..a37e5b6f9d25 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -442,7 +442,7 @@ extern u64 hwpoison_filter_flags_value;
extern u64 hwpoison_filter_memcg;
extern u32 hwpoison_filter_enable;
-extern unsigned long vm_mmap_pgoff(struct file *, unsigned long,
+extern unsigned long __must_check vm_mmap_pgoff(struct file *, unsigned long,
unsigned long, unsigned long,
unsigned long, unsigned long);
diff --git a/mm/madvise.c b/mm/madvise.c
index 07427d3fcead..93fb63e88b5e 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -707,10 +707,12 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
return error;
write = madvise_need_mmap_write(behavior);
- if (write)
- down_write(&current->mm->mmap_sem);
- else
+ if (write) {
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
+ } else {
down_read(&current->mm->mmap_sem);
+ }
/*
* If the interval [start,end) covers some unmapped address
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index b3f16ab4b431..cf428d7b9a03 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1604,7 +1604,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg)
static void mem_cgroup_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
{
- if (!current->memcg_may_oom)
+ if (!current->memcg_may_oom || current->memcg_in_oom)
return;
/*
* We are in the middle of the charge context here, so we
diff --git a/mm/mlock.c b/mm/mlock.c
index 96f001041928..ef8dc9f395c4 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -617,7 +617,7 @@ static int apply_vma_lock_flags(unsigned long start, size_t len,
return error;
}
-static int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
+static __must_check int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
{
unsigned long locked;
unsigned long lock_limit;
@@ -635,7 +635,8 @@ static int do_mlock(unsigned long start, size_t len, vm_flags_t flags)
lock_limit >>= PAGE_SHIFT;
locked = len >> PAGE_SHIFT;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
locked += current->mm->locked_vm;
@@ -678,7 +679,8 @@ SYSCALL_DEFINE2(munlock, unsigned long, start, size_t, len)
len = PAGE_ALIGN(len + (offset_in_page(start)));
start &= PAGE_MASK;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
ret = apply_vma_lock_flags(start, len, 0);
up_write(&current->mm->mmap_sem);
@@ -748,9 +750,10 @@ SYSCALL_DEFINE1(mlockall, int, flags)
lock_limit = rlimit(RLIMIT_MEMLOCK);
lock_limit >>= PAGE_SHIFT;
- ret = -ENOMEM;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
+ ret = -ENOMEM;
if (!(flags & MCL_CURRENT) || (current->mm->total_vm <= lock_limit) ||
capable(CAP_IPC_LOCK))
ret = apply_mlockall_flags(flags);
@@ -765,7 +768,8 @@ SYSCALL_DEFINE0(munlockall)
{
int ret;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
ret = apply_mlockall_flags(0);
up_write(&current->mm->mmap_sem);
return ret;
diff --git a/mm/mmap.c b/mm/mmap.c
index b9274a0c82c9..d3d9a94ca031 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -178,7 +178,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
unsigned long min_brk;
bool populate;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
#ifdef CONFIG_COMPAT_BRK
/*
@@ -2493,7 +2494,9 @@ int vm_munmap(unsigned long start, size_t len)
int ret;
struct mm_struct *mm = current->mm;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
ret = do_munmap(mm, start, len);
up_write(&mm->mmap_sem);
return ret;
@@ -2502,8 +2505,15 @@ EXPORT_SYMBOL(vm_munmap);
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
{
+ int ret;
+ struct mm_struct *mm = current->mm;
+
profile_munmap(addr);
- return vm_munmap(addr, len);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+ ret = do_munmap(mm, addr, len);
+ up_write(&mm->mmap_sem);
+ return ret;
}
@@ -2535,7 +2545,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
if (pgoff + (size >> PAGE_SHIFT) < pgoff)
return ret;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
vma = find_vma(mm, start);
if (!vma || !(vma->vm_flags & VM_SHARED))
@@ -2700,7 +2712,9 @@ unsigned long vm_brk(unsigned long addr, unsigned long len)
unsigned long ret;
bool populate;
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+
ret = do_brk(addr, len);
populate = ((mm->def_flags & VM_LOCKED) != 0);
up_write(&mm->mmap_sem);
diff --git a/mm/mprotect.c b/mm/mprotect.c
index b650c5412f58..5019a1ef2848 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -379,7 +379,8 @@ SYSCALL_DEFINE3(mprotect, unsigned long, start, size_t, len,
reqprot = prot;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
vma = find_vma(current->mm, start);
error = -ENOMEM;
diff --git a/mm/mremap.c b/mm/mremap.c
index 9dc499977924..1f157adfdaf9 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -503,7 +503,8 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
if (!new_len)
return ret;
- down_write(&current->mm->mmap_sem);
+ if (down_write_killable(&current->mm->mmap_sem))
+ return -EINTR;
if (flags & MREMAP_FIXED) {
ret = mremap_to(addr, old_len, new_addr, new_len,
diff --git a/mm/util.c b/mm/util.c
index 8a1b3a1fb595..917e0e3d0f8e 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -297,7 +297,8 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
ret = security_mmap_file(file, prot, flag);
if (!ret) {
- down_write(&mm->mmap_sem);
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff,
&populate);
up_write(&mm->mmap_sem);