# git gc # git rev-parse -q --verify a9dce6679d736cb3d612af39bab9f31f8db66f9b^{commit} a9dce6679d736cb3d612af39bab9f31f8db66f9b already have revision, skipping fetch # git checkout -q -f -B kisskb a9dce6679d736cb3d612af39bab9f31f8db66f9b # git clean -qxdf # < git log -1 # commit a9dce6679d736cb3d612af39bab9f31f8db66f9b # Merge: f67e3fb48912 575a0ae9744d # Author: Linus Torvalds # Date: Sat Mar 16 13:47:14 2019 -0700 # # Merge tag 'pidfd-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux # # Pull pidfd system call from Christian Brauner: # "This introduces the ability to use file descriptors from /proc// # as stable handles on struct pid. Even if a pid is recycled the handle # will not change. For a start these fds can be used to send signals to # the processes they refer to. # # With the ability to use /proc/ fds as stable handles on struct # pid we can fix a long-standing issue where after a process has exited # its pid can be reused by another process. If a caller sends a signal # to a reused pid it will end up signaling the wrong process. # # With this patchset we enable a variety of use cases. One obvious # example is that we can now safely delegate an important part of # process management - sending signals - to processes other than the # parent of a given process by sending file descriptors around via scm # rights and not fearing that the given process will have been recycled # in the meantime. It also allows for easy testing whether a given # process is still alive or not by sending signal 0 to a pidfd which is # quite handy. # # There has been some interest in this feature e.g. from systems # management (systemd, glibc) and container managers. I have requested # and gotten comments from glibc to make sure that this syscall is # suitable for their needs as well. In the future I expect it to take on # most other pid-based signal syscalls. But such features are left for # the future once they are needed. # # This has been sitting in linux-next for quite a while and has not # caused any issues. It comes with selftests which verify basic # functionality and also test that a recycled pid cannot be signaled via # a pidfd. # # Jon has written about a prior version of this patchset. It should # cover the basic functionality since not a lot has changed since then: # # https://lwn.net/Articles/773459/ # # The commit message for the syscall itself is extensively documenting # the syscall, including it's functionality and extensibility" # # * tag 'pidfd-v5.1-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux: # selftests: add tests for pidfd_send_signal() # signal: add pidfd_send_signal() syscall # < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux-ld --version # < git log --format=%s --max-count=1 a9dce6679d736cb3d612af39bab9f31f8db66f9b # < make -s -j 120 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- defconfig # make -s -j 120 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mips CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/mips-linux/bin/mips-linux- /kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25 :1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp] :1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp] :1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp] :1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp] /kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25 /kisskb/src/kernel/rcu/srcutree.c: In function 'init_srcu_struct_fields': /kisskb/src/kernel/rcu/srcutree.c:140:32: warning: 'levelspread[]' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/kernel/rcu/srcutree.c:88:6: note: 'levelspread[]' was declared here /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:187:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/notify/fanotify/fanotify.c: In function 'fanotify_encode_fid': /kisskb/src/fs/notify/fanotify/fanotify.c:249:2: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'long int' [-Wformat] /kisskb/src/fs/notify/fanotify/fanotify.c:249:2: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'long int' [-Wformat] /kisskb/src/fs/proc/inode.c: In function 'proc_reg_open': /kisskb/src/include/linux/list.h:65:12: warning: 'pdeo' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/proc/inode.c:337:21: note: 'pdeo' was declared here /kisskb/src/drivers/base/regmap/regmap.c: In function '_regmap_raw_write': /kisskb/src/drivers/base/regmap/regmap.c:1855:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/base/regmap/regmap.c: In function 'regmap_raw_read': /kisskb/src/drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/i2c/i2c-core-base.c: In function 'i2c_generic_scl_recovery': /kisskb/src/drivers/i2c/i2c-core-base.c:235:5: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/fs/notify/mark.c: In function 'fsnotify_add_mark_list': /kisskb/src/fs/notify/mark.c:587:3: warning: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'long int' [-Wformat] /kisskb/src/fs/notify/mark.c:587:3: warning: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'long int' [-Wformat] /kisskb/src/fs/notify/mark.c:587:3: warning: format '%x' expects argument of type 'unsigned int', but argument 6 has type 'long int' [-Wformat] /kisskb/src/fs/notify/mark.c:587:3: warning: format '%x' expects argument of type 'unsigned int', but argument 7 has type 'long int' [-Wformat] /kisskb/src/fs/fs_parser.c: In function 'fs_validate_description': /kisskb/src/fs/fs_parser.c:413:6: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'int' [-Wformat] /kisskb/src/drivers/tty/serial/8250/8250_core.c: In function 'univ8250_release_irq': /kisskb/src/drivers/tty/serial/8250/8250_core.c:247:18: warning: 'i' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/drivers/tty/serial/8250/8250_core.c:227:19: note: 'i' was declared here /kisskb/src/net/sunrpc/xprtsock.c: In function 'xs_read_stream_request.constprop.17': /kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'read' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] :1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp] :1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp] :1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp] :1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp] /kisskb/src/arch/mips/vdso/Makefile:39: MIPS VDSO requires binutils >= 2.25 /kisskb/src/kernel/printk/printk.c: In function 'devkmsg_sysctl_set_loglvl': /kisskb/src/kernel/printk/printk.c:187:16: warning: 'old' may be used uninitialized in this function [-Wuninitialized] FIT description: Linux 5.0.0-ga9dce6679d73 Created: Sun Mar 17 10:18:56 2019 Image 0 (kernel@0) Description: Linux 5.0.0-ga9dce6679d73 Created: Sun Mar 17 10:18:56 2019 Type: Kernel Image Compression: gzip compressed Data Size: 4371014 Bytes = 4268.57 KiB = 4.17 MiB Architecture: MIPS OS: Linux Load Address: 0x80100000 Entry Point: 0x8081d8f0 Hash algo: sha1 Hash value: 7d6f52de52356591cab869c6a73e5b593d01cd3d Image 1 (fdt@boston) Description: img,boston Device Tree Created: Sun Mar 17 10:18:56 2019 Type: Flat Device Tree Compression: uncompressed Data Size: 3793 Bytes = 3.70 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 4799f50d688573234da6e9d7701234d394759ef4 Image 2 (fdt@ni169445) Description: NI 169445 device tree Created: Sun Mar 17 10:18:56 2019 Type: Flat Device Tree Compression: uncompressed Data Size: 1871 Bytes = 1.83 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 51b89b31605ee62038c8468c429af091dfc75ec7 Image 3 (fdt@xilfpga) Description: MIPSfpga (xilfpga) Device Tree Created: Sun Mar 17 10:18:56 2019 Type: Flat Device Tree Compression: uncompressed Data Size: 2708 Bytes = 2.64 KiB = 0.00 MiB Architecture: MIPS Hash algo: sha1 Hash value: 63d058b780f65e22da30f0a183433765f1807f1d Default Configuration: 'conf@default' Configuration 0 (conf@default) Description: Generic Linux kernel Kernel: kernel@0 Configuration 1 (conf@boston) Description: Boston Linux kernel Kernel: kernel@0 FDT: fdt@boston Configuration 2 (conf@ni169445) Description: NI 169445 Linux Kernel Kernel: kernel@0 FDT: fdt@ni169445 Configuration 3 (conf@xilfpga) Description: MIPSfpga Linux kernel Kernel: kernel@0 FDT: fdt@xilfpga Completed OK # rm -rf /kisskb/build/linus_mips-defconfig_mips # Build took: 0:03:31.901682