kernel.git/arch/um/drivers, branch linux-6.15.y

um: rtc: Avoid shadowing err in uml_rtc_start()

2025-08-15T10:16:29Z

[ Upstream commit 4c916e3b224a02019b3cc3983a15f32bfd9a22df ] Remove the declaration of 'err' inside the 'if (timetravel)' block, as it would otherwise be unavailable outside that block, potentially leading to uml_rtc_start() returning an uninitialized value. Fixes: dde8b58d5127 ("um: add a pseudo RTC") Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250708090403.1067440-5-tiwei.bie@linux.dev Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin

um: vector: Reduce stack usage in vector_eth_configure()

2025-07-17T16:44:01Z

[ Upstream commit 2d65fc13be85c336c56af7077f08ccd3a3a15a4a ] 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 Signed-off-by: Sasha Levin

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

2025-07-06T09:04:16Z

[ Upstream commit c55c7a85e02a7bfee20a3ffebdff7cbeb41613ef ] 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 Signed-off-by: Sasha Levin

treewide: Switch/rename to timer_delete[_sync]()

2025-04-05T08:30:12Z

timer_delete[_sync]() replaces del_timer[_sync](). Convert the whole tree over and remove the historical wrapper inlines. Conversion was done with coccinelle plus manual fixups where necessary. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar

um: Rewrite the sigio workaround based on epoll and tgkill

2025-03-20T08:28:44Z

The existing sigio workaround implementation removes FDs from the poll when events are triggered, requiring users to re-add them via add_sigio_fd() after processing. This introduces a potential race condition between FD removal in write_sigio_thread() and next_poll update in __add_sigio_fd(), and is inefficient due to frequent FD removal and re-addition. Rewrite the implementation based on epoll and tgkill for improved efficiency and reliability. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250315161910.4082396-2-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

um: ubd: Switch to the pthread-based helper

2025-03-20T08:26:38Z

The ubd io thread and UML kernel thread share the same errno, which can lead to conflicts when both call syscalls concurrently. Switch to the pthread-based helper to address this issue. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250319135523.97050-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

um: virt-pci: Refactor virtio_pcidev into its own module

2025-03-18T10:06:54Z

Decouple virt-pci and virtio_pcidev, refactoring virtio_pcidev into its own module. Define a set of APIs for virt-pci. This allows for future addition of more PCI emulation implementations. Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250315161910.4082396-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg

um: virtio_uml: use raw spinlock

2025-02-12T22:40:55Z

This is needed because at least in time-travel the code can be called directly from the deep architecture and IRQ handling code. Link: https://patch.msgid.link/20250110125550.32479-7-johannes@sipsolutions.net Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger

um: virt-pci: don't use kmalloc()

2025-02-12T22:40:50Z

This code can be called deep in the IRQ handling, for example, and then cannot normally use kmalloc(). Have its own pre-allocated memory and use from there instead so this doesn't occur. Only in the (very rare) case of memcpy_toio() we'd still need to allocate memory. Link: https://patch.msgid.link/20250110125550.32479-6-johannes@sipsolutions.net Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger

Merge tag 'uml-for-linus-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux

2025-01-31T02:29:40Z

Pull UML updates from Richard Weinberger: - hostfs: Convert to writepages - many cleanups: removal of dead macros, missing __init * tag 'uml-for-linus-6.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/uml/linux: um: Remove unused asm/archparam.h header um: Include missing headers in asm/pgtable.h hostfs: Convert to writepages um: rtc: use RTC time when calculating the alarm um: Remove unused user_context function um: Remove unused THREAD_NAME_LEN macro um: Remove unused PGD_BOUND macro um: Mark setup_env_path as __init um: Mark install_fatal_handler as __init um: Mark set_stklim as __init um: Mark get_top_address as __init um: Mark parse_cache_line as __init um: Mark parse_host_cpu_flags as __init um: Count iomem_size only once in physmem calculation um: Remove obsolete fixmap support um: Remove unused MODULES_LEN macro