| Commit message (Collapse) | Author | Age | Files | Lines |
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Older versions of gcc don't understand named initializers inside a
anonymous structure or union member. It can be worked around by adding
the bracin gin the initializer for the anonymous member.
Without this, gcc 4.4.4 will fail the build with
CC fs/nfs/nfs4state.o
fs/nfs/nfs4state.c:69: error: unknown field ‘data’ specified in initializer
fs/nfs/nfs4state.c:69: warning: missing braces around initializer
fs/nfs/nfs4state.c:69: warning: (near initialization for ‘zero_stateid.<anonymous>.data’)
make[2]: *** [fs/nfs/nfs4state.o] Error 1
introduced in commit 93b717fd81bf ("NFSv4: Label stateids with the type")
Reported-and-tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Anna Schumaker <Anna.Schumaker@netapp.com>
Cc: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro:
"Followups to the parallel lookup work:
- update docs
- restore killability of the places that used to take ->i_mutex
killably now that we have down_write_killable() merged
- Additionally, it turns out that I missed a prerequisite for
security_d_instantiate() stuff - ->getxattr() wasn't the only thing
that could be called before dentry is attached to inode; with smack
we needed the same treatment applied to ->setxattr() as well"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
switch ->setxattr() to passing dentry and inode separately
switch xattr_handler->set() to passing dentry and inode separately
restore killability of old mutex_lock_killable(&inode->i_mutex) users
add down_write_killable_nested()
update D/f/directory-locking
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smack ->d_instantiate() uses ->setxattr(), so to be able to call it before
we'd hashed the new dentry and attached it to inode, we need ->setxattr()
instances getting the inode as an explicit argument rather than obtaining
it from dentry.
Similar change for ->getxattr() had been done in commit ce23e64. Unlike
->getxattr() (which is used by both selinux and smack instances of
->d_instantiate()) ->setxattr() is used only by smack one and unfortunately
it got missed back then.
Reported-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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preparation for similar switch in ->setxattr() (see the next commit for
rationale).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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The ones that are taking it exclusive, that is...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull overlayfs update from Miklos Szeredi:
"The meat of this is a change to use the mounter's credentials for
operations that require elevated privileges (such as whiteout
creation). This fixes behavior under user namespaces as well as being
a nice cleanup"
* 'overlayfs-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
ovl: Do d_type check only if work dir creation was successful
ovl: update documentation
ovl: override creds with the ones from the superblock mounter
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d_type check requires successful creation of workdir as iterates
through work dir and expects work dir to be present in it. If that's
not the case, this check will always return d_type not supported even
if underlying filesystem might be supporting it.
So don't do this check if work dir creation failed in previous step.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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Two "fixme" items are actually fixed now.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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In user namespace the whiteout creation fails with -EPERM because the
current process isn't capable(CAP_SYS_ADMIN) when setting xattr.
A simple reproducer:
$ mkdir upper lower work merged lower/dir
$ sudo mount -t overlay overlay -olowerdir=lower,upperdir=upper,workdir=work merged
$ unshare -m -p -f -U -r bash
Now as root in the user namespace:
\# touch merged/dir/{1,2,3} # this will force a copy up of lower/dir
\# rm -fR merged/*
This ends up failing with -EPERM after the files in dir has been
correctly deleted:
unlinkat(4, "2", 0) = 0
unlinkat(4, "1", 0) = 0
unlinkat(4, "3", 0) = 0
close(4) = 0
unlinkat(AT_FDCWD, "merged/dir", AT_REMOVEDIR) = -1 EPERM (Operation not
permitted)
Interestingly, if you don't place files in merged/dir you can remove it,
meaning if upper/dir does not exist, creating the char device file works
properly in that same location.
This patch uses ovl_sb_creator_cred() to get the cred struct from the
superblock mounter and override the old cred with these new ones so that
the whiteout creation is possible because overlay is wrong in assuming that
the creds it will get with prepare_creds will be in the initial user
namespace. The old cap_raise game is removed in favor of just overriding
the old cred struct.
This patch also drops from ovl_copy_up_one() the following two lines:
override_cred->fsuid = stat->uid;
override_cred->fsgid = stat->gid;
This is because the correct uid and gid are taken directly with the stat
struct and correctly set with ovl_set_attr().
Signed-off-by: Antonio Murdaca <runcom@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
Pull btrfs cleanups and fixes from Chris Mason:
"We have another round of fixes and a few cleanups.
I have a fix for short returns from btrfs_copy_from_user, which
finally nails down a very hard to find regression we added in v4.6.
Dave is pushing around gfp parameters, mostly to cleanup internal apis
and make it a little more consistent.
The rest are smaller fixes, and one speelling fixup patch"
* 'for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs: (22 commits)
Btrfs: fix handling of faults from btrfs_copy_from_user
btrfs: fix string and comment grammatical issues and typos
btrfs: scrub: Set bbio to NULL before calling btrfs_map_block
Btrfs: fix unexpected return value of fiemap
Btrfs: free sys_array eb as soon as possible
btrfs: sink gfp parameter to convert_extent_bit
btrfs: make state preallocation more speculative in __set_extent_bit
btrfs: untangle gotos a bit in convert_extent_bit
btrfs: untangle gotos a bit in __clear_extent_bit
btrfs: untangle gotos a bit in __set_extent_bit
btrfs: sink gfp parameter to set_record_extent_bits
btrfs: sink gfp parameter to set_extent_new
btrfs: sink gfp parameter to set_extent_defrag
btrfs: sink gfp parameter to set_extent_delalloc
btrfs: sink gfp parameter to clear_extent_dirty
btrfs: sink gfp parameter to clear_record_extent_bits
btrfs: sink gfp parameter to clear_extent_bits
btrfs: sink gfp parameter to set_extent_bits
btrfs: make find_workspace warn if there are no workspaces
btrfs: make find_workspace always succeed
...
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When btrfs_copy_from_user isn't able to copy all of the pages, we need
to adjust our accounting to reflect the work that was actually done.
Commit 2e78c927d79 changed around the decisions a little and we ended up
skipping the accounting adjustments some of the time. This commit makes
sure that when we don't copy anything at all, we still hop into
the adjustments, and switches to release_bytes instead of write_bytes,
since write_bytes isn't aligned.
The accounting errors led to warnings during btrfs_destroy_inode:
[ 70.847532] WARNING: CPU: 10 PID: 514 at fs/btrfs/inode.c:9350 btrfs_destroy_inode+0x2b3/0x2c0
[ 70.847536] Modules linked in: i2c_piix4 virtio_net i2c_core input_leds button led_class serio_raw acpi_cpufreq sch_fq_codel autofs4 virtio_blk
[ 70.847538] CPU: 10 PID: 514 Comm: umount Tainted: G W 4.6.0-rc6_00062_g2997da1-dirty #23
[ 70.847539] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.0-1.fc24 04/01/2014
[ 70.847542] 0000000000000000 ffff880ff5cafab8 ffffffff8149d5e9 0000000000000202
[ 70.847543] 0000000000000000 0000000000000000 0000000000000000 ffff880ff5cafb08
[ 70.847547] ffffffff8107bdfd ffff880ff5cafaf8 000024868120013d ffff880ff5cafb28
[ 70.847547] Call Trace:
[ 70.847550] [<ffffffff8149d5e9>] dump_stack+0x51/0x78
[ 70.847551] [<ffffffff8107bdfd>] __warn+0xfd/0x120
[ 70.847553] [<ffffffff8107be3d>] warn_slowpath_null+0x1d/0x20
[ 70.847555] [<ffffffff8139c9e3>] btrfs_destroy_inode+0x2b3/0x2c0
[ 70.847556] [<ffffffff812003a1>] ? __destroy_inode+0x71/0x140
[ 70.847558] [<ffffffff812004b3>] destroy_inode+0x43/0x70
[ 70.847559] [<ffffffff810b7b5f>] ? wake_up_bit+0x2f/0x40
[ 70.847560] [<ffffffff81200c68>] evict+0x148/0x1d0
[ 70.847562] [<ffffffff81398ade>] ? start_transaction+0x3de/0x460
[ 70.847564] [<ffffffff81200d49>] dispose_list+0x59/0x80
[ 70.847565] [<ffffffff81201ba0>] evict_inodes+0x180/0x190
[ 70.847566] [<ffffffff812191ff>] ? __sync_filesystem+0x3f/0x50
[ 70.847568] [<ffffffff811e95f8>] generic_shutdown_super+0x48/0x100
[ 70.847569] [<ffffffff810b75c0>] ? woken_wake_function+0x20/0x20
[ 70.847571] [<ffffffff811e9796>] kill_anon_super+0x16/0x30
[ 70.847573] [<ffffffff81365cde>] btrfs_kill_super+0x1e/0x130
[ 70.847574] [<ffffffff811e99be>] deactivate_locked_super+0x4e/0x90
[ 70.847576] [<ffffffff811e9e61>] deactivate_super+0x51/0x70
[ 70.847577] [<ffffffff8120536f>] cleanup_mnt+0x3f/0x80
[ 70.847579] [<ffffffff81205402>] __cleanup_mnt+0x12/0x20
[ 70.847581] [<ffffffff81098358>] task_work_run+0x68/0xa0
[ 70.847582] [<ffffffff810022b6>] exit_to_usermode_loop+0xd6/0xe0
[ 70.847583] [<ffffffff81002e1d>] do_syscall_64+0xbd/0x170
[ 70.847586] [<ffffffff817d4dbc>] entry_SYSCALL64_slow_path+0x25/0x25
This is the test program I used to force short returns from
btrfs_copy_from_user
void *dontneed(void *arg)
{
char *p = arg;
int ret;
while(1) {
ret = madvise(p, BUFSIZE/4, MADV_DONTNEED);
if (ret) {
perror("madvise");
exit(1);
}
}
}
int main(int ac, char **av) {
int ret;
int fd;
char *filename;
unsigned long offset;
char *buf;
int i;
pthread_t tid;
if (ac != 2) {
fprintf(stderr, "usage: dammitdave filename\n");
exit(1);
}
buf = mmap(NULL, BUFSIZE, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (buf == MAP_FAILED) {
perror("mmap");
exit(1);
}
memset(buf, 'a', BUFSIZE);
filename = av[1];
ret = pthread_create(&tid, NULL, dontneed, buf);
if (ret) {
fprintf(stderr, "error %d from pthread_create\n", ret);
exit(1);
}
ret = pthread_detach(tid);
if (ret) {
fprintf(stderr, "pthread detach failed %d\n", ret);
exit(1);
}
while (1) {
fd = open(filename, O_RDWR | O_CREAT, 0600);
if (fd < 0) {
perror("open");
exit(1);
}
for (i = 0; i < ROUNDS; i++) {
int this_write = BUFSIZE;
offset = rand() % MAXSIZE;
ret = pwrite(fd, buf, this_write, offset);
if (ret < 0) {
perror("pwrite");
exit(1);
} else if (ret != this_write) {
fprintf(stderr, "short write to %s offset %lu ret %d\n",
filename, offset, ret);
exit(1);
}
if (i == ROUNDS - 1) {
ret = sync_file_range(fd, offset, 4096,
SYNC_FILE_RANGE_WRITE);
if (ret < 0) {
perror("sync_file_range");
exit(1);
}
}
}
ret = ftruncate(fd, 0);
if (ret < 0) {
perror("ftruncate");
exit(1);
}
ret = close(fd);
if (ret) {
perror("close");
exit(1);
}
ret = unlink(filename);
if (ret) {
perror("unlink");
exit(1);
}
}
return 0;
}
Signed-off-by: Chris Mason <clm@fb.com>
Reported-by: Dave Jones <dsj@fb.com>
Fixes: 2e78c927d79333f299a8ac81c2fd2952caeef335
cc: stable@vger.kernel.org # v4.6
Signed-off-by: Chris Mason <clm@fb.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux into for-linus-4.7
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Be verbose if there are no workspaces at all, ie. the module init time
preallocation failed.
Signed-off-by: David Sterba <dsterba@suse.com>
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With just one preallocated workspace we can guarantee forward progress
even if there's no memory available for new workspaces. The cost is more
waiting but we also get rid of several error paths.
On average, there will be several idle workspaces, so the waiting
penalty won't be so bad.
In the worst case, all cpus will compete for one workspace until there's
some memory. Attempts to allocate a new one are done each time the
waiters are woken up.
Signed-off-by: David Sterba <dsterba@suse.com>
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Preallocate one workspace for each compression type so we can guarantee
forward progress in the worst case. A failure cannot be a hard error as
we might not use compression at all on the filesystem. If we can't
allocate the workspaces later when need them, it might actually
deadlock, but in such situation the system has effectively not enough
memory to operate properly.
Signed-off-by: David Sterba <dsterba@suse.com>
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The names are confusing, pick more fitting names and add comments.
Signed-off-by: David Sterba <dsterba@suse.com>
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Signed-off-by: Nicholas D Steeves <nsteeves@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Single caller passes GFP_NOFS. We can get rid of the
gfpflags_allow_blocking checks as NOFS can block but does not recurse to
filesystem through reclaim.
Signed-off-by: David Sterba <dsterba@suse.com>
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Similar to __clear_extent_bit, do not fail if the state preallocation
fails as we might not need it. One less BUG_ON.
Signed-off-by: David Sterba <dsterba@suse.com>
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Signed-off-by: David Sterba <dsterba@suse.com>
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Signed-off-by: David Sterba <dsterba@suse.com>
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Signed-off-by: David Sterba <dsterba@suse.com>
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Single caller passes GFP_NOFS.
Signed-off-by: David Sterba <dsterba@suse.com>
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Single caller passes GFP_NOFS.
Signed-off-by: David Sterba <dsterba@suse.com>
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Single caller passes GFP_NOFS.
Signed-off-by: David Sterba <dsterba@suse.com>
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Callers pass GFP_NOFS and tests pass GFP_KERNEL, but using NOFS there
does not hurt. No need to pass the flags around.
Signed-off-by: David Sterba <dsterba@suse.com>
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Callers pass GFP_NOFS. No need to pass the flags around.
Signed-off-by: David Sterba <dsterba@suse.com>
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Callers pass GFP_NOFS. No need to pass the flags around.
Signed-off-by: David Sterba <dsterba@suse.com>
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Callers pass GFP_NOFS and GFP_KERNEL. No need to pass the flags around.
Signed-off-by: David Sterba <dsterba@suse.com>
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All callers pass GFP_NOFS.
Signed-off-by: David Sterba <dsterba@suse.com>
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We usually call btrfs_put_bbio() when btrfs_map_block() failed,
btrfs_put_bbio() works right whether bbio is a valid value, or NULL.
But there is a exception, in some case, btrfs_map_block() will return
fail without touching *bbio(keeping its original value), and if bbio
was not initialized yet, invalid memory accessing will happened.
Above case is in scrub_missing_raid56_pages(), and similar case in
scrub_raid56_parity().
Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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btrfs's fiemap is supposed to return 0 on success and return < 0 on
error. however, ret becomes 1 after looking up the last file extent:
btrfs_lookup_file_extent ->
btrfs_search_slot(..., ins_len=0, cow=0)
and if the offset is beyond EOF, we'll get 'path' pointed to the place
of potentail insertion, and ret == 1.
This may confuse applications using ioctl(FIEL_IOC_FIEMAP).
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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While reading sys_chunk_array in superblock, btrfs creates a temporary
extent buffer. Since we don't use it after finishing reading
sys_chunk_array, we don't need to keep it in memory.
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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Now that the allmodconfig x86-64 build is clean wrt IS_ERR_VALUE() uses
on integers, add a cast to a pointer and back to the argument, so that
any new mis-uses of IS_ERR_VALUE() will cause warnings like
warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
so that we don't re-introduce any bogus uses.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The do_brk() and vm_brk() return value was "unsigned long" and returned
the starting address on success, and an error value on failure. The
reasons are entirely historical, and go back to it basically behaving
like the mmap() interface does.
However, nobody actually wanted that interface, and it causes totally
pointless IS_ERR_VALUE() confusion.
What every single caller actually wants is just the simpler integer
return of zero for success and negative error number on failure.
So just convert to that much clearer and more common calling convention,
and get rid of all the IS_ERR_VALUE() uses wrt vm_brk().
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Most users of IS_ERR_VALUE() in the kernel are wrong, as they
pass an 'int' into a function that takes an 'unsigned long'
argument. This happens to work because the type is sign-extended
on 64-bit architectures before it gets converted into an
unsigned type.
However, anything that passes an 'unsigned short' or 'unsigned int'
argument into IS_ERR_VALUE() is guaranteed to be broken, as are
8-bit integers and types that are wider than 'unsigned long'.
Andrzej Hajda has already fixed a lot of the worst abusers that
were causing actual bugs, but it would be nice to prevent any
users that are not passing 'unsigned long' arguments.
This patch changes all users of IS_ERR_VALUE() that I could find
on 32-bit ARM randconfig builds and x86 allmodconfig. For the
moment, this doesn't change the definition of IS_ERR_VALUE()
because there are probably still architecture specific users
elsewhere.
Almost all the warnings I got are for files that are better off
using 'if (err)' or 'if (err < 0)'.
The only legitimate user I could find that we get a warning for
is the (32-bit only) freescale fman driver, so I did not remove
the IS_ERR_VALUE() there but changed the type to 'unsigned long'.
For 9pfs, I just worked around one user whose calling conventions
are so obscure that I did not dare change the behavior.
I was using this definition for testing:
#define IS_ERR_VALUE(x) ((unsigned long*)NULL == (typeof (x)*)NULL && \
unlikely((unsigned long long)(x) >= (unsigned long long)(typeof(x))-MAX_ERRNO))
which ends up making all 16-bit or wider types work correctly with
the most plausible interpretation of what IS_ERR_VALUE() was supposed
to return according to its users, but also causes a compile-time
warning for any users that do not pass an 'unsigned long' argument.
I suggested this approach earlier this year, but back then we ended
up deciding to just fix the users that are obviously broken. After
the initial warning that caused me to get involved in the discussion
(fs/gfs2/dir.c) showed up again in the mainline kernel, Linus
asked me to send the whole thing again.
[ Updated the 9p parts as per Al Viro - Linus ]
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lkml.org/lkml/2016/1/7/363
Link: https://lkml.org/lkml/2016/5/27/486
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> # For nvmem part
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The register_page_bootmem_info_node() function needs to be marked __init
in order to avoid a new warning introduced by commit f65e91df25aa ("mm:
use early_pfn_to_nid in register_page_bootmem_info_node").
Otherwise you'll get a warning about how a non-init function calls
early_pfn_to_nid (which is __meminit)
Cc: Yang Shi <yang.shi@linaro.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Merge misc updates and fixes from Andrew Morton:
- late-breaking ocfs2 updates
- random bunch of fixes
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
mm: disable DEFERRED_STRUCT_PAGE_INIT on !NO_BOOTMEM
mm/memcontrol.c: move comments for get_mctgt_type() to proper position
mm/memcontrol.c: fix the margin computation in mem_cgroup_margin()
mm/cma: silence warnings due to max() usage
mm: thp: avoid false positive VM_BUG_ON_PAGE in page_move_anon_rmap()
oom_reaper: close race with exiting task
mm: use early_pfn_to_nid in register_page_bootmem_info_node
mm: use early_pfn_to_nid in page_ext_init
MAINTAINERS: Kdump maintainers update
MAINTAINERS: add kexec_core.c and kexec_file.c
mm: oom: do not reap task if there are live threads in threadgroup
direct-io: fix direct write stale data exposure from concurrent buffered read
ocfs2: bump up o2cb network protocol version
ocfs2: o2hb: fix hb hung time
ocfs2: o2hb: don't negotiate if last hb fail
ocfs2: o2hb: add some user/debug log
ocfs2: o2hb: add NEGOTIATE_APPROVE message
ocfs2: o2hb: add NEGO_TIMEOUT message
ocfs2: o2hb: add negotiate timer
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When we have !NO_BOOTMEM, the deferred page struct initialization
doesn't work well because the pages reserved in bootmem are released to
the page allocator uncoditionally. It causes memory corruption and
system crash eventually.
As Mel suggested, the bootmem is retiring slowly. We fix the issue by
simply hiding DEFERRED_STRUCT_PAGE_INIT when bootmem is enabled.
Link: http://lkml.kernel.org/r/1460602170-5821-1-git-send-email-gwshan@linux.vnet.ibm.com
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Move the comments for get_mctgt_type() to be before get_mctgt_type()
implementation.
Link: http://lkml.kernel.org/r/1463644638-7446-1-git-send-email-roy.qing.li@gmail.com
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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mem_cgroup_margin() might return (memory.limit - memory_count) when the
memsw.limit is in excess. This doesn't happen usually because we do not
allow excess on hard limits and (memory.limit <= memsw.limit), but
__GFP_NOFAIL charges can force the charge and cause the excess when no
memory is really swappable (swap is full or no anonymous memory is
left).
[mhocko@suse.com: rewrote changelog]
Link: http://lkml.kernel.org/r/20160525155122.GK20132@dhcp22.suse.cz
Link: http://lkml.kernel.org/r/1464068266-27736-1-git-send-email-roy.qing.li@gmail.com
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Vladimir Davydov <vdavydov@virtuozzo.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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pageblock_order can be (at least) an unsigned int or an unsigned long
depending on the kernel config and architecture, so use max_t(unsigned
long, ...) when comparing it.
fixes these warnings:
In file included from include/asm-generic/bug.h:13:0,
from arch/powerpc/include/asm/bug.h:127,
from include/linux/bug.h:4,
from include/linux/mmdebug.h:4,
from include/linux/mm.h:8,
from include/linux/memblock.h:18,
from mm/cma.c:28:
mm/cma.c: In function 'cma_init_reserved_mem':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
(void) (&_max1 == &_max2); ^
mm/cma.c:186:27: note: in expansion of macro 'max'
alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
^
mm/cma.c: In function 'cma_declare_contiguous':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
(void) (&_max1 == &_max2); ^
include/linux/kernel.h:747:9: note: in definition of macro 'max'
typeof(y) _max2 = (y); ^
mm/cma.c:270:29: note: in expansion of macro 'max'
(phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
^
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
(void) (&_max1 == &_max2); ^
include/linux/kernel.h:747:21: note: in definition of macro 'max'
typeof(y) _max2 = (y); ^
mm/cma.c:270:29: note: in expansion of macro 'max'
(phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
^
[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20160526150748.5be38a4f@canb.auug.org.au
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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If page_move_anon_rmap() is refiling a pmd-splitted THP mapped in a tail
page from a pte, the "address" must be THP aligned in order for the
page->index bugcheck to pass in the CONFIG_DEBUG_VM=y builds.
Link: http://lkml.kernel.org/r/1464253620-106404-1-git-send-email-kirill.shutemov@linux.intel.com
Fixes: 6d0a07edd17c ("mm: thp: calculate the mapcount correctly for THP pages during WP faults")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Cc: <stable@vger.kernel.org> [4.5]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tetsuo has reported:
Out of memory: Kill process 443 (oleg's-test) score 855 or sacrifice child
Killed process 443 (oleg's-test) total-vm:493248kB, anon-rss:423880kB, file-rss:4kB, shmem-rss:0kB
sh invoked oom-killer: gfp_mask=0x24201ca(GFP_HIGHUSER_MOVABLE|__GFP_COLD), order=0, oom_score_adj=0
sh cpuset=/ mems_allowed=0
CPU: 2 PID: 1 Comm: sh Not tainted 4.6.0-rc7+ #51
Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
Call Trace:
dump_stack+0x85/0xc8
dump_header+0x5b/0x394
oom_reaper: reaped process 443 (oleg's-test), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
In other words:
__oom_reap_task exit_mm
atomic_inc_not_zero
tsk->mm = NULL
mmput
atomic_dec_and_test # > 0
exit_oom_victim # New victim will be
# selected
<OOM killer invoked>
# no TIF_MEMDIE task so we can select a new one
unmap_page_range # to release the memory
The race exists even without the oom_reaper because anybody who pins the
address space and gets preempted might race with exit_mm but oom_reaper
made this race more probable.
We can address the oom_reaper part by using oom_lock for __oom_reap_task
because this would guarantee that a new oom victim will not be selected
if the oom reaper might race with the exit path. This doesn't solve the
original issue, though, because somebody else still might be pinning
mm_users and so __mmput won't be called to release the memory but that
is not really realiably solvable because the task will get away from the
oom sight as soon as it is unhashed from the task_list and so we cannot
guarantee a new victim won't be selected.
[akpm@linux-foundation.org: fix use of unused `mm', Per Stephen]
[akpm@linux-foundation.org: coding-style fixes]
Fixes: aac453635549 ("mm, oom: introduce oom reaper")
Link: http://lkml.kernel.org/r/1464271493-20008-1-git-send-email-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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register_page_bootmem_info_node() is invoked in mem_init(), so it will
be called before page_alloc_init_late() if DEFERRED_STRUCT_PAGE_INIT is
enabled. But, pfn_to_nid() depends on memmap which won't be fully setup
until page_alloc_init_late() is done, so replace pfn_to_nid() by
early_pfn_to_nid().
Link: http://lkml.kernel.org/r/1464210007-30930-1-git-send-email-yang.shi@linaro.org
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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