# 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 <torvalds@linux-foundation.org>
# 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/<pid>/
#       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/<pid> 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/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-gcc --version
# < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-ld --version
# < git log --format=%s --max-count=1 a9dce6679d736cb3d612af39bab9f31f8db66f9b
# < make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  defconfig
# make -s -j 80 ARCH=mips O=/kisskb/build/linus_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-  
<stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp]
<stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp]
<stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp]
<stdin>:1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp]
/kisskb/src/net/sunrpc/xprtsock.c: In function 'xs_read_stream_request.constprop':
/kisskb/src/net/sunrpc/xprtsock.c:525:10: warning: 'read' may be used uninitialized in this function [-Wmaybe-uninitialized]
   return read;
          ^
/kisskb/src/net/sunrpc/xprtsock.c:529:9: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return ret < 0 ? ret : read;
         ^
In file included from /kisskb/src/include/linux/kernel.h:15:0,
                 from /kisskb/src/include/linux/list.h:9,
                 from /kisskb/src/include/linux/preempt.h:11,
                 from /kisskb/src/include/linux/spinlock.h:51,
                 from /kisskb/src/include/linux/fdtable.h:11,
                 from /kisskb/src/fs/notify/fanotify/fanotify.c:3:
/kisskb/src/fs/notify/fanotify/fanotify.c: In function 'fanotify_encode_fid':
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 2 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/fanotify/fanotify.c:249:2: note: in expansion of macro 'pr_warn_ratelimited'
  pr_warn_ratelimited("fanotify: failed to encode fid (fsid=%x.%x, "
  ^
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 3 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/fanotify/fanotify.c:249:2: note: in expansion of macro 'pr_warn_ratelimited'
  pr_warn_ratelimited("fanotify: failed to encode fid (fsid=%x.%x, "
  ^
In file included from /kisskb/src/include/linux/kernel.h:15:0,
                 from /kisskb/src/include/linux/list.h:9,
                 from /kisskb/src/include/linux/wait.h:7,
                 from /kisskb/src/include/linux/wait_bit.h:8,
                 from /kisskb/src/include/linux/fs.h:6,
                 from /kisskb/src/fs/notify/mark.c:76:
/kisskb/src/fs/notify/mark.c: In function 'fsnotify_add_mark_list':
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 4 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/mark.c:587:3: note: in expansion of macro 'pr_warn_ratelimited'
   pr_warn_ratelimited("%s: fsid mismatch on object of type %u: "
   ^
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 5 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/mark.c:587:3: note: in expansion of macro 'pr_warn_ratelimited'
   pr_warn_ratelimited("%s: fsid mismatch on object of type %u: "
   ^
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 6 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/mark.c:587:3: note: in expansion of macro 'pr_warn_ratelimited'
   pr_warn_ratelimited("%s: fsid mismatch on object of type %u: "
   ^
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%x' expects argument of type 'unsigned int', but argument 7 has type 'long int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/printk.h:423:10: note: in definition of macro 'printk_ratelimited'
   printk(fmt, ##__VA_ARGS__);    \
          ^
/kisskb/src/include/linux/kern_levels.h:12:22: note: in expansion of macro 'KERN_SOH'
 #define KERN_WARNING KERN_SOH "4" /* warning conditions */
                      ^
/kisskb/src/include/linux/printk.h:439:21: note: in expansion of macro 'KERN_WARNING'
  printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
                     ^
/kisskb/src/fs/notify/mark.c:587:3: note: in expansion of macro 'pr_warn_ratelimited'
   pr_warn_ratelimited("%s: fsid mismatch on object of type %u: "
   ^
In file included from /kisskb/src/include/linux/printk.h:7:0,
                 from /kisskb/src/include/linux/kernel.h:15,
                 from /kisskb/src/include/linux/fs_context.h:15,
                 from /kisskb/src/fs/fs_parser.c:13:
/kisskb/src/fs/fs_parser.c: In function 'fs_validate_description':
/kisskb/src/include/linux/kern_levels.h:5:18: warning: format '%lu' expects argument of type 'long unsigned int', but argument 3 has type 'int' [-Wformat=]
 #define KERN_SOH "\001"  /* ASCII Start Of Header */
                  ^
/kisskb/src/include/linux/kern_levels.h:11:18: note: in expansion of macro 'KERN_SOH'
 #define KERN_ERR KERN_SOH "3" /* error conditions */
                  ^
/kisskb/src/include/linux/printk.h:302:9: note: in expansion of macro 'KERN_ERR'
  printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
         ^
/kisskb/src/fs/fs_parser.c:413:6: note: in expansion of macro 'pr_err'
      pr_err("VALIDATE %s: e[%lu] enum val for %s\n",
      ^
<stdin>:1478:2: warning: #warning syscall pidfd_send_signal not implemented [-Wcpp]
<stdin>:1481:2: warning: #warning syscall io_uring_setup not implemented [-Wcpp]
<stdin>:1484:2: warning: #warning syscall io_uring_enter not implemented [-Wcpp]
<stdin>:1487:2: warning: #warning syscall io_uring_register not implemented [-Wcpp]
FIT description: Linux 5.0.0-ga9dce6679d73
Created:         Sun Mar 17 10:18:10 2019
 Image 0 (kernel@0)
  Description:  Linux 5.0.0-ga9dce6679d73
  Created:      Sun Mar 17 10:18:10 2019
  Type:         Kernel Image
  Compression:  gzip compressed
  Data Size:    4547266 Bytes = 4440.69 KiB = 4.34 MiB
  Architecture: MIPS
  OS:           Linux
  Load Address: 0x80100000
  Entry Point:  0x80867290
  Hash algo:    sha1
  Hash value:   ec14d49e72b58feae24d92528041043625e85d98
 Image 1 (fdt@boston)
  Description:  img,boston Device Tree
  Created:      Sun Mar 17 10:18:10 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 10:18:10 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 10:18:10 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_mipsel
# Build took: 0:01:43.874945