kernel/linux.git/drivers/char/mem.c, branch v6.6.132

drivers/char/mem.c: shrink character device's devlist[] array

2023-08-24T23:25:15+00:00

Merge padding, shrinking "struct memdev" from 32 bytes to 24 bytes on 64-bit. Link: https://lkml.kernel.org/r/fe4d62ab-2427-4635-b9f4-467853fb63e3@p183 Signed-off-by: Alexey Dobriyan Cc: Greg Kroah-Hartman Signed-off-by: Andrew Morton

Merge tag 'char-misc-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

2023-07-03T19:46:47+00:00

Pull Char/Misc updates from Greg KH: "Here is the big set of char/misc and other driver subsystem updates for 6.5-rc1. Lots of different, tiny, stuff in here, from a range of smaller driver subsystems, including pulls from some substems directly: - IIO driver updates and additions - W1 driver updates and fixes (and a new maintainer!) - FPGA driver updates and fixes - Counter driver updates - Extcon driver updates - Interconnect driver updates - Coresight driver updates - mfd tree tag merge needed for other updates on top of that, lots of small driver updates as patches, including: - static const updates for class structures - nvmem driver updates - pcmcia driver fix - lots of other small driver updates and fixes All of these have been in linux-next for a while with no reported problems" * tag 'char-misc-6.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (243 commits) bsr: fix build problem with bsr_class static cleanup comedi: make all 'class' structures const char: xillybus: make xillybus_class a static const structure xilinx_hwicap: make icap_class a static const structure virtio_console: make port class a static const structure ppdev: make ppdev_class a static const structure char: misc: make misc_class a static const structure /dev/mem: make mem_class a static const structure char: lp: make lp_class a static const structure dsp56k: make dsp56k_class a static const structure bsr: make bsr_class a static const structure oradax: make 'cl' a static const structure hwtracing: hisi_ptt: Fix potential sleep in atomic context hwtracing: hisi_ptt: Advertise PERF_PMU_CAP_NO_EXCLUDE for PTT PMU hwtracing: hisi_ptt: Export available filters through sysfs hwtracing: hisi_ptt: Add support for dynamically updating the filter list hwtracing: hisi_ptt: Factor out filter allocation and release operation samples: pfsm: add CC_CAN_LINK dependency misc: fastrpc: check return value of devm_kasprintf() coresight: dummy: Update type of mode parameter in dummy_{sink,source}_enable() ...

/dev/mem: make mem_class a static const structure

2023-06-23T08:27:13+00:00

Now that the driver core allows for struct class to be in read-only memory, move the mem_class structure to be declared at build time placing it into read-only memory, instead of having to be dynamically allocated at load time. Cc: Arnd Bergmann Suggested-by: Greg Kroah-Hartman Signed-off-by: Ivan Orlov Link: https://lore.kernel.org/r/20230620143751.578239-13-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

mips: provide unxlate_dev_mem_ptr() in asm/io.h

2023-06-09T07:48:53+00:00

The unxlate_dev_mem_ptr() function has no prototype on the mips architecture, which does not include asm-generic/io.h, so gcc warns about the __weak definition: drivers/char/mem.c:94:29: error: no previous prototype for 'unxlate_dev_mem_ptr' [-Werror=missing-prototypes] Since everyone else already gets the generic definition or has a custom one, there is not really much point in having a __weak version as well. Remove this one, and instead add a trivial macro to the mips header. Once we convert mips to use the asm-generic header, this can go away again. Signed-off-by: Arnd Bergmann Signed-off-by: Thomas Bogendoerfer

driver core: class: remove module * from class_create()

2023-03-17T14:16:33+00:00

The module pointer in class_create() never actually did anything, and it shouldn't have been requred to be set as a parameter even if it did something. So just remove it and fix up all callers of the function in the kernel tree at the same time. Cc: "Rafael J. Wysocki" Acked-by: Benjamin Tissoires Link: https://lore.kernel.org/r/20230313181843.1207845-4-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

mm/nommu: factor out check for NOMMU shared mappings into is_nommu_shared_mapping()

2023-01-19T01:12:56+00:00

Patch series "mm/nommu: don't use VM_MAYSHARE for MAP_PRIVATE mappings". Trying to reduce the confusion around VM_SHARED and VM_MAYSHARE first requires !CONFIG_MMU to stop using VM_MAYSHARE for MAP_PRIVATE mappings. CONFIG_MMU only sets VM_MAYSHARE for MAP_SHARED mappings. This paves the way for further VM_MAYSHARE and VM_SHARED cleanups: for example, renaming VM_MAYSHARED to VM_MAP_SHARED to make it cleaner what is actually means. Let's first get the weird case out of the way and not use VM_MAYSHARE in MAP_PRIVATE mappings, using a new VM_MAYOVERLAY flag instead. This patch (of 3): We want to stop using VM_MAYSHARE in private mappings to pave the way for clarifying the semantics of VM_MAYSHARE vs. VM_SHARED and reduce the confusion. While CONFIG_MMU uses VM_MAYSHARE to represent MAP_SHARED, !CONFIG_MMU also sets VM_MAYSHARE for selected R/O private file mappings that are an effective overlay of a file mapping. Let's factor out all relevant VM_MAYSHARE checks in !CONFIG_MMU code into is_nommu_shared_mapping() first. Note that whenever VM_SHARED is set, VM_MAYSHARE must be set as well (unless there is a serious BUG). So there is not need to test for VM_SHARED manually. No functional change intended. Link: https://lkml.kernel.org/r/20230102160856.500584-1-david@redhat.com Link: https://lkml.kernel.org/r/20230102160856.500584-2-david@redhat.com Signed-off-by: David Hildenbrand Cc: Arnd Bergmann Cc: David Hildenbrand Cc: Greg Kroah-Hartman Cc: Jens Axboe Cc: Nicolas Pitre Cc: Pavel Begunkov Signed-off-by: Andrew Morton

driver core: make struct class.devnode() take a const *

2022-11-24T16:12:27+00:00

The devnode() in struct class should not be modifying the device that is passed into it, so mark it as a const * and propagate the function signature changes out into all relevant subsystems that use this callback. Cc: Fenghua Yu Cc: Reinette Chatre Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: FUJITA Tomonori Cc: Jens Axboe Cc: Justin Sanders Cc: Arnd Bergmann Cc: Sumit Semwal Cc: Benjamin Gaignard Cc: Liam Mark Cc: Laura Abbott Cc: Brian Starkey Cc: John Stultz Cc: "Christian König" Cc: Maarten Lankhorst Cc: Maxime Ripard Cc: Thomas Zimmermann Cc: David Airlie Cc: Daniel Vetter Cc: Jason Gunthorpe Cc: Leon Romanovsky Cc: Dennis Dalessandro Cc: Dmitry Torokhov Cc: Mauro Carvalho Chehab Cc: Sean Young Cc: Frank Haverkamp Cc: Jiri Slaby Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: Alex Williamson Cc: Cornelia Huck Cc: Kees Cook Cc: Anton Vorontsov Cc: Colin Cross Cc: Tony Luck Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Hans Verkuil Cc: Christophe JAILLET Cc: Xie Yongji Cc: Gautam Dawar Cc: Dan Carpenter Cc: Eli Cohen Cc: Parav Pandit Cc: Maxime Coquelin Cc: alsa-devel@alsa-project.org Cc: dri-devel@lists.freedesktop.org Cc: kvm@vger.kernel.org Cc: linaro-mm-sig@lists.linaro.org Cc: linux-block@vger.kernel.org Cc: linux-input@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: linux-rdma@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: linux-usb@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Link: https://lore.kernel.org/r/20221123122523.1332370-2-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman

random: restore O_NONBLOCK support

2022-09-23T10:27:57+00:00

Prior to 5.6, when /dev/random was opened with O_NONBLOCK, it would return -EAGAIN if there was no entropy. When the pools were unified in 5.6, this was lost. The post 5.6 behavior of blocking until the pool is initialized, and ignoring O_NONBLOCK in the process, went unnoticed, with no reports about the regression received for two and a half years. However, eventually this indeed did break somebody's userspace. So we restore the old behavior, by returning -EAGAIN if the pool is not initialized. Unlike the old /dev/random, this can only occur during early boot, after which it never blocks again. In order to make this O_NONBLOCK behavior consistent with other expectations, also respect users reading with preadv2(RWF_NOWAIT) and similar. Fixes: 30c08efec888 ("random: make /dev/random be almost like /dev/urandom") Reported-by: Guozihua Reported-by: Zhongguohua Cc: Al Viro Cc: Theodore Ts'o Cc: Andrew Lutomirski Cc: stable@vger.kernel.org Signed-off-by: Jason A. Donenfeld

/dev/null: add IORING_OP_URING_CMD support

2022-08-26T15:19:44+00:00

This patch adds support for the io_uring command pass through, aka IORING_OP_URING_CMD, to the /dev/null driver. As with all of the /dev/null functionality, the implementation is just a simple sink where commands go to die, but it should be useful for developers who need a simple IORING_OP_URING_CMD test device that doesn't require any special hardware. Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Acked-by: Jens Axboe Signed-off-by: Paul Moore

/dev/mem: make reads and writes interruptible

2022-04-24T15:31:01+00:00

In 8619e5bdeee8 ("/dev/mem: Bail out upon SIGKILL."), /dev/mem became killable, and that commit noted: Theoretically, reading/writing /dev/mem and /dev/kmem can become "interruptible". But this patch chose "killable". Future patch will make them "interruptible" so that we can revert to "killable" if some program regressed. So now we take the next step in making it "interruptible", by changing fatal_signal_pending() into signal_pending(). Cc: Tetsuo Handa Signed-off-by: Jason A. Donenfeld Link: https://lore.kernel.org/r/20220407122638.490660-1-Jason@zx2c4.com Signed-off-by: Greg Kroah-Hartman