# 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/powerpc-linux/bin/powerpc-linux-gcc --version # < /opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux-ld --version # < git log --format=%s --max-count=1 a9dce6679d736cb3d612af39bab9f31f8db66f9b # < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_mpc83xx_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- mpc83xx_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_mpc83xx_defconfig_powerpc-gcc4.6 CROSS_COMPILE=/opt/cross/kisskb/gcc-4.6.3-nolibc/powerpc-linux/bin/powerpc-linux- :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/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/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_read': /kisskb/src/drivers/base/regmap/regmap.c:2594:6: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /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/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/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/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/net/sunrpc/xprtsock.c: In function 'xs_stream_data_receive_workfn': /kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'ret' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/sunrpc/xprtsock.c:499:10: note: 'ret' was declared here /kisskb/src/net/sunrpc/xprtsock.c:529:2: warning: 'read' may be used uninitialized in this function [-Wuninitialized] /kisskb/src/net/sunrpc/xprtsock.c:498:15: note: 'read' was declared here INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x638fa4) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) INFO: Uncompressed kernel (size 0x649650) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x700000) Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:07 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3163585 Bytes = 3089.44 KiB = 3.02 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:07 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193589 Bytes = 3118.74 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:07 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193308 Bytes = 3118.46 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193570 Bytes = 3118.72 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193376 Bytes = 3118.53 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193497 Bytes = 3118.65 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Image Name: Linux-5.0.0-ga9dce6679d73 Created: Sun Mar 17 08:52:08 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3193824 Bytes = 3118.97 KiB = 3.05 MiB Load Address: 00700000 Entry Point: 00700290 Completed OK # rm -rf /kisskb/build/linus_mpc83xx_defconfig_powerpc-gcc4.6 # Build took: 0:00:38.113823