linux.git/arch/um/drivers, branch v6.16

um: vector: Reduce stack usage in vector_eth_configure()

2025-06-25T07:28:17+00:00

When compiling with clang (19.1.7), initializing *vp using a compound
literal may result in excessive stack usage. Fix it by initializing the
required fields of *vp individually.

Without this patch:

$ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0
...
0x0000000000000540 vector_eth_configure [vector_kern.o]:1472
...

With this patch:

$ objdump -d arch/um/drivers/vector_kern.o | ./scripts/checkstack.pl x86_64 0
...
0x0000000000000540 vector_eth_configure [vector_kern.o]:208
...

Reported-by: kernel test robot 
Closes: https://lore.kernel.org/oe-kbuild-all/202506221017.WtB7Usua-lkp@intel.com/
Signed-off-by: Tiwei Bie 
Link: https://patch.msgid.link/20250623110829.314864-1-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: vfio: Prevent duplicate device assignments

2025-06-25T07:26:06+00:00

Ensure devices are assigned only once. Reject subsequent requests
for duplicate assignments.

Fixes: a0e2cb6a9063 ("um: Add VFIO-based virtual PCI driver")
Signed-off-by: Tiwei Bie 
Link: https://patch.msgid.link/20250606124428.148164-4-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: ubd: Add missing error check in start_io_thread()

2025-06-25T07:25:49+00:00

The subsequent call to os_set_fd_block() overwrites the previous
return value. OR the two return values together to fix it.

Fixes: f88f0bdfc32f ("um: UBD Improvements")
Signed-off-by: Tiwei Bie 
Link: https://patch.msgid.link/20250606124428.148164-2-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

treewide, timers: Rename from_timer() to timer_container_of()

2025-06-08T07:07:37+00:00

Move this API to the canonical timer_*() namespace.

[ tglx: Redone against pre rc1 ]

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/aB2X0jCKQO56WdMt@gmail.com

um: vector: Use mac_pton() for MAC address parsing

2025-06-02T09:24:04+00:00

Use mac_pton() instead of custom approach.

Suggested-by: Geert Uytterhoeven 
Signed-off-by: Tiwei Bie 
Link: https://patch.msgid.link/20250506045117.1896661-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: vector: Clean up and modernize log messages

2025-06-02T09:24:03+00:00

Use pr_*() and netdev_*() to print log messages. While at it,
join split messages for easier grepping.

Suggested-by: Geert Uytterhoeven 
Signed-off-by: Tiwei Bie 
Link: https://patch.msgid.link/20250506045117.1896661-2-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: chan_kern: use raw spinlock for irqs_to_free_lock

2025-06-02T09:23:22+00:00

Since this is called deep in the ARCH=um IRQ infrastructure
it must use a raw spinlock. It's not really part of the
driver, but rather the core UML IRQ code.

Link: https://patch.msgid.link/20250505103358.ae7dc659f8b4.I64ca7aece30e0b4b0b5b35ad89cdd63db197c0ce@changeid
Signed-off-by: Johannes Berg

um: Remove legacy network transport infrastructure

2025-05-05T08:26:59+00:00

All legacy network transports have been removed. Vector transports
provide the same capabilities with significantly higher network
throughput. There is no reason to keep the legacy network transport
infrastructure anymore. Remove it to reduce the maintenance burden.

Signed-off-by: Tiwei Bie 
Acked-By: Anton Ivanov 
Link: https://patch.msgid.link/20250503051710.3286595-4-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: vector: Eliminate the dependency on uml_net

2025-05-05T08:26:59+00:00

The only dependency on uml_net (i.e., the legacy network transport
infrastructure) is the call to uml_net_setup_etheraddr(). Implement
it inside vector to eliminate the uml_net dependency completely. It
will allow us to remove uml_net in the next step.

Signed-off-by: Tiwei Bie 
Acked-By: Anton Ivanov 
Link: https://patch.msgid.link/20250503051710.3286595-3-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg

um: Remove obsolete legacy network transports

2025-05-05T08:26:59+00:00

These legacy network transports were marked as obsolete in commit
40814b98a570 ("um: Mark non-vector net transports as obsolete").
More than five years have passed since then. Remove these network
transports to reduce the maintenance burden.

Suggested-by: Anton Ivanov 
Signed-off-by: Tiwei Bie 
Acked-By: Anton Ivanov 
Link: https://patch.msgid.link/20250503051710.3286595-2-tiwei.btw@antgroup.com
Signed-off-by: Johannes Berg