Eric W. Biederman c39ab6de22 coredump: Document coredump code exclusively used by cell spufs ... Oleg Nesterov recently asked[1] why is there an unshare_files in do_coredump. After digging through all of the callers of lookup_fd it turns out that it is arch/powerpc/platforms/cell/spufs/coredump.c:coredump_next_context that needs the unshare_files in do_coredump. Looking at the history[2] this code was also the only piece of coredump code that required the unshare_files when the unshare_files was added. Looking at that code it turns out that cell is also the only architecture that implements elf_coredump_extra_notes_size and elf_coredump_extra_notes_write. I looked at the gdb repo[3] support for cell has been removed[4] in binutils 2.34. Geoff Levand reports he is still getting questions on how to run modern kernels on the PS3, from people using 3rd party firmware so this code is not dead. According to Wikipedia the last PS3 shipped in Japan sometime in 2017. So it will probably be a little while before everyone's hardware dies. Add some comments briefly documenting the coredump code that exists only to support cell spufs to make it easier to understand the coredump code. Eventually the hardware will be dead, or their won't be userspace tools, or the coredump code will be refactored and it will be too difficult to update a dead architecture and these comments make it easy to tell where to pull to remove cell spufs support. [1] https://lkml.kernel.org/r/20201123175052.GA20279@redhat.com [2] 179e037fc1 ("do_coredump(): make sure that descriptor table isn't shared") [3] git://sourceware.org/git/binutils-gdb.git [4] abf516c6931a ("Remove Cell Broadband Engine debugging support"). Link: https://lkml.kernel.org/r/87h7pdnlzv.fsf_-_@x220.int.ebiederm.org Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>		2020-12-10 12:57:08 -06:00
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9p	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
adfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
affs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
afs	afs fixes	2020-10-16 15:22:41 -07:00
autofs	file: Replace ksys_close with close_fd	2020-12-10 12:42:59 -06:00
befs
bfs
btrfs	block-5.10-2020-10-12	2020-10-13 12:12:44 -07:00
cachefiles
ceph	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
cifs	cifs: update internal module version number	2020-10-23 23:41:49 -05:00
coda
configfs	fs: configfs: delete repeated words in comments	2020-10-16 11:11:19 -07:00
cramfs
crypto	fscrypt: export fscrypt_d_revalidate()	2020-09-28 14:44:51 -07:00
debugfs
devpts
dlm	networking changes for the 5.10 merge window	2020-10-15 18:42:13 -07:00
ecryptfs
efivarfs	efivarfs: Replace invalid slashes with exclamation marks in dentries.	2020-09-25 23:29:04 +02:00
efs
erofs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
exfat	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
exportfs
ext2	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
ext4	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
f2fs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
fat
freevxfs
fscache
fuse	fuse update for 5.10	2020-10-19 14:28:30 -07:00
gfs2	gfs2: Recover statfs info in journal head	2020-10-23 15:47:38 +02:00
hfs
hfsplus	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
hostfs
hpfs
hugetlbfs
iomap	iomap: Call inode_dio_end() before generic_write_sync()	2020-09-28 08:51:08 -07:00
isofs
jbd2	jbd2: fast commit recovery path	2020-10-21 23:22:37 -04:00
jffs2
jfs
kernfs
lockd	The one new feature this time, from Anna Schumaker, is READ_PLUS, which	2020-10-22 09:44:27 -07:00
minix
nfs	The one new feature this time, from Anna Schumaker, is READ_PLUS, which	2020-10-22 09:44:27 -07:00
nfs_common	NFSv4.2: Fix NFS4ERR_STALE error when doing inter server copy	2020-10-21 10:31:20 -04:00
nfsd	The one new feature this time, from Anna Schumaker, is READ_PLUS, which	2020-10-22 09:44:27 -07:00
nilfs2	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
nls
notify	file: Rename fcheck lookup_fd_rcu	2020-12-10 12:40:07 -06:00
ntfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
ocfs2	The siginificant new ext4 feature this time around is Harshad's new	2020-10-22 10:31:08 -07:00
omfs
openpromfs
orangefs
overlayfs	ovl: use generic vfs_ioc_setflags_prepare() helper	2020-10-06 15:38:15 +02:00
proc	proc/fd: In fdinfo seq_show don't use get_files_struct	2020-12-10 12:42:58 -06:00
pstore
qnx4
qnx6
quota	\n	2020-10-15 14:56:15 -07:00
ramfs	ramfs: fix nommu mmap with gaps in the page cache	2020-10-16 11:11:22 -07:00
reiserfs	reiserfs: Fix oops during mount	2020-10-01 11:15:31 +02:00
romfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
squashfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
sysfs	sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output	2020-10-02 12:02:30 +02:00
sysv
tracefs
ubifs	This pull request contains fixes for UBI and UBIFS	2020-10-18 09:56:50 -07:00
udf	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
ufs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
unicode
vboxsf	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2020-10-15 15:11:56 -07:00
verity
xfs	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
zonefs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
aio.c	Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-12 16:35:51 -07:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c
binfmt_elf.c	coredump: Document coredump code exclusively used by cell spufs	2020-12-10 12:57:08 -06:00
binfmt_elf_fdpic.c	binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot	2020-10-16 11:11:21 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
block_dev.c	block: add a bdget_part helper	2020-10-05 10:38:33 -06:00
buffer.c	mm, memcg: rework remote charging API to support nesting	2020-10-18 09:27:09 -07:00
char_dev.c
compat_binfmt_elf.c
coredump.c	coredump: Document coredump code exclusively used by cell spufs	2020-12-10 12:57:08 -06:00
d_path.c	fs: fix NULL dereference due to data race in prepend_path()	2020-10-14 14:54:45 -07:00
dax.c	fuse update for 5.10	2020-10-19 14:28:30 -07:00
dcache.c
dcookies.c
direct-io.c	\n	2020-10-15 15:03:10 -07:00
drop_caches.c
eventfd.c
eventpoll.c	ep_create_wakeup_source(): dentry name can change under you...	2020-09-24 19:41:58 -04:00
exec.c	exec: Simplify unshare_files	2020-12-10 12:39:32 -06:00
fcntl.c
fhandle.c
file.c	file: Remove get_files_struct	2020-12-10 12:42:59 -06:00
file_table.c	task_work: cleanup notification modes	2020-10-17 15:05:30 -06:00
filesystems.c
fs-writeback.c	block-5.10-2020-10-12	2020-10-13 12:12:44 -07:00
fs_context.c
fs_parser.c	fs_parse: mark fs_param_bad_value() as static	2020-10-13 18:38:27 -07:00
fs_pin.c
fs_struct.c
fs_types.c
fsopen.c
init.c
inode.c	fs: add a filesystem flag for THPs	2020-10-16 11:11:15 -07:00
internal.h
io-wq.c	io-wq: re-set NUMA node affinities if CPUs come online	2020-10-22 09:02:50 -06:00
io-wq.h	io_uring: unify fsize with def->work_flags	2020-10-20 16:03:13 -06:00
io_uring.c	file: Rename __close_fd_get_file close_fd_get_file	2020-12-10 12:42:59 -06:00
ioctl.c
Kconfig
Kconfig.binfmt
kernel_read_file.c	fs/kernel_file_read: Add "offset" arg for partial reads	2020-10-05 13:37:04 +02:00
libfs.c
locks.c	file: Factor files_lookup_fd_locked out of fcheck_files	2020-12-10 12:39:59 -06:00
Makefile	Refactored code for 5.10:	2020-10-23 11:33:41 -07:00
mbcache.c
mount.h
mpage.c
namei.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
namespace.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-24 12:26:05 -07:00
no-block.c
nsfs.c
open.c	file: Rename __close_fd to close_fd and remove the files parameter	2020-12-10 12:42:59 -06:00
pipe.c	Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-10-11 11:11:35 -07:00
pnode.c
pnode.h
posix_acl.c
proc_namespace.c
read_write.c	Refactored code for 5.10:	2020-10-23 11:33:41 -07:00
readdir.c
remap_range.c	vfs: move the remap range helpers to remap_range.c	2020-10-15 09:48:49 -07:00
select.c
seq_file.c
signalfd.c
splice.c	io_uring-5.10-2020-10-24	2020-10-24 12:40:18 -07:00
stack.c
stat.c	fs: remove KSTAT_QUERY_FLAGS	2020-09-26 22:55:05 -04:00
statfs.c
super.c	bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag	2020-09-24 13:43:39 -06:00
sync.c
timerfd.c
userfaultfd.c	mm: remove the now-unnecessary mmget_still_valid() hack	2020-10-16 11:11:22 -07:00
utimes.c
xattr.c	fs/xattr.c: fix kernel-doc warnings for setxattr & removexattr	2020-10-13 18:38:27 -07:00