lift the calls of ep_read_events_proc() into the callers

Expand the calls of ep_scan_ready_list() that get ep_read_events_proc().
As a side benefit we can pass depth to ep_read_events_proc() by valu

lift the calls of ep_read_events_proc() into the callers

Expand the calls of ep_scan_ready_list() that get ep_read_events_proc().
As a side benefit we can pass depth to ep_read_events_proc() by value
and not by address - the latter used to be forced by the signature
expected from ep_scan_ready_list() callback.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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ep_scan_ready_list(): prepare to splitup

take the stuff done before and after the callback into separate helpers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

ep_loop_check_proc(): saner calling conventions

1) 'cookie' argument is unused; kill it.
2) 'priv' one is always an epoll struct file, and we only care
about its associated struct eventpoll; pass th

ep_loop_check_proc(): saner calling conventions

1) 'cookie' argument is unused; kill it.
2) 'priv' one is always an epoll struct file, and we only care
about its associated struct eventpoll; pass that instead.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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get rid of ep_push_nested()

The only remaining user is loop checking. But there we only need
to check that we have not walked into the epoll we are inserting
into - we are adding an edge to acyclic

get rid of ep_push_nested()

The only remaining user is loop checking. But there we only need
to check that we have not walked into the epoll we are inserting
into - we are adding an edge to acyclic graph, so any loop being
created will have to pass through the source of that edge.

So we don't need that array of cookies - we have only one eventpoll
to watch out for. RIP ep_push_nested(), along with the cookies
array.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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ep_loop_check_proc(): lift pushing the cookie into callers

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

clean reverse_path_check_proc() a bit

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

reverse_path_check_proc(): don't bother with cookies

We know there's no loops by the time we call it; the
only thing we care about is too deep reverse paths.

Signed-off-by: Al Viro <viro@zeniv.linu

reverse_path_check_proc(): don't bother with cookies

We know there's no loops by the time we call it; the
only thing we care about is too deep reverse paths.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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reverse_path_check_proc(): sane arguments

no need to force its calling conventions to match the callback for
late unlamented ep_call_nested()...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

untangling ep_call_nested(): and there was much rejoicing

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

untangling ep_call_nested(): move push/pop of cookie into the callbacks

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

untangling ep_call_nested(): take pushing cookie into a helper

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

untangling ep_call_nested(): it's all serialized on epmutex.

IOW,
* no locking is needed to protect the list
* the list is actually a stack
* no need to check ->ctx
* it can bloody well be a sta

untangling ep_call_nested(): it's all serialized on epmutex.

IOW,
* no locking is needed to protect the list
* the list is actually a stack
* no need to check ->ctx
* it can bloody well be a static 5-element array - nobody is
going to be accessing it in parallel.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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untangling ep_call_nested(): get rid of useless arguments

ctx is always equal to current, ncalls - to &poll_loop_ncalls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

epoll: get rid of epitem->nwait

we use it only to indicate allocation failures within queueing
callback back to ep_insert(). Might as well use epq.epi for that
reporting...

Signed-off-by: Al Viro

epoll: get rid of epitem->nwait

we use it only to indicate allocation failures within queueing
callback back to ep_insert(). Might as well use epq.epi for that
reporting...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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epoll: switch epitem->pwqlist to single-linked list

We only traverse it once to destroy all associated eppoll_entry at
epitem destruction time. The order of traversal is irrelevant there.

Signed-o

epoll: switch epitem->pwqlist to single-linked list

We only traverse it once to destroy all associated eppoll_entry at
epitem destruction time. The order of traversal is irrelevant there.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Merge branch 'dynamic_sg' into rdma.git for-next

From Maor Gottlieb says:

====================
This series extends __sg_alloc_table_from_pages to allow chaining of new
pages to an already initializ

Merge branch 'dynamic_sg' into rdma.git for-next

From Maor Gottlieb says:

====================
This series extends __sg_alloc_table_from_pages to allow chaining of new
pages to an already initialized SG table.

This allows for drivers to utilize the optimization of merging contiguous
pages without a need to pre allocate all the pages and hold them in a very
large temporary buffer prior to the call to SG table initialization.

The last patch changes the Infiniband core to use the new API. It removes
duplicate functionality from the code and benefits from the optimization
of allocating dynamic SG table from pages.

In huge pages system of 2MB page size, without this change, the SG table
would contain x512 SG entries.
====================

* branch 'dynamic_sg':
RDMA/umem: Move to allocate SG table from pages
lib/scatterlist: Add support in dynamic allocation of SG table from pages
tools/testing/scatterlist: Show errors in human readable form
tools/testing/scatterlist: Rejuvenate bit-rotten test

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Merge branch 'for-5.10/core' into for-linus

- nonblocking read semantics fix for hid-debug

Merge tag 'asoc-v5.10' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Updates for v5.10

Not a huge amount going on in the core for ASoC this time but quite a

Merge tag 'asoc-v5.10' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-linus

ASoC: Updates for v5.10

Not a huge amount going on in the core for ASoC this time but quite a
lot of driver activity, especially for the Intel platforms:

- Replacement of the DSP driver for some older x86 systems with a new
one which was written with closer reference to the DSP firmware so
should hopefully be more robust and maintainable.
- A big batch of static checker and other fixes for the rest of the x86
DSP drivers.
- Cleanup of the error unwinding code from Morimoto-san, hopefully
making it more robust.
- Helpers for parsing auxiluary devices from the device tree from
Stephan Gerhold.
- New support for AllWinner A64, Cirrus Logic CS4234, Mediatek MT6359
Microchip S/PDIF TX and RX controllers, Realtek RT1015P, and Texas
Instruments J721E, TAS2110, TAS2564 and TAS2764

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Merge tag 'spi-nor/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux into mtd/next

SPI NOR core changes:
- Support for Winbond w25q64jwm flash
- Enable 4K sector support for mx25l

Merge tag 'spi-nor/for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux into mtd/next

SPI NOR core changes:
- Support for Winbond w25q64jwm flash
- Enable 4K sector support for mx25l12805d

SPI NOR controller drivers changes:
- intel-spi:
- Add Alder Lake-S PCI ID

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Merge branch 'locking/urgent' into locking/core, to pick up fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>

Merge tag 'v5.9-rc5' into asoc-5.10

Linux 5.9-rc5

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Rejecting non-native endian BTF overlapped with the addition
of support for it.

The rest were more simple overlapping changes, except

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Rejecting non-native endian BTF overlapped with the addition
of support for it.

The rest were more simple overlapping changes, except the
renesas ravb binding update, which had to follow a file
move as well as a YAML conversion.

Signed-off-by: David S. Miller <davem@davemloft.net>

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Merge 5.9-rc8 into staging-next

We need the IIO fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge 5.9-rc8 into usb-next

We need the USB fixes in here as well for testing.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Merge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull epoll fixes from Al Viro:
"Several race fixes in epoll"

* 'work.epoll' of git://git.kernel.org/pub/scm/linu

Merge branch 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull epoll fixes from Al Viro:
"Several race fixes in epoll"

* 'work.epoll' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
ep_create_wakeup_source(): dentry name can change under you...
epoll: EPOLL_CTL_ADD: close the race in decision to take fast path
epoll: replace ->visited/visited_list with generation count
epoll: do not insert into poll queues until all sanity checks are done

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