0387662d - selftests: fix warning: "_GNU_SOURCE" redefined

Thu, 11 Oct 2018 19:53:50 +0000

selftests: fix warning: "_GNU_SOURCE" redefinedMakefile contains -D_GNU_SOURCE. remove define "_GNU_SOURCE"in c files.Signed-off-by: Peng Hao Signed-off-by: Shuah Khan (Samsung OSG) List of files: /linux-6.15/tools/testing/selftests/proc/fd-003-kthread.c

b2f5de03 - tools/testing/selftests/proc: test /proc/*/fd a bit (+ PF_KTHREAD is ABI!)

Fri, 08 Jun 2018 00:10:20 +0000

tools/testing/selftests/proc: test /proc/*/fd a bit (+ PF_KTHREAD is ABI!)* Test lookup in /proc/self/fd. "map_files" lookup story showed that lookup is not that simple.* Test that all those symlinks open the same file. Check with (st_dev, st_info).* Test that kernel threads do not have anything in their /proc/*/fd/ directory.Now this is where things get interesting.First, kernel threads aren't pinned by /proc/self or equivalent,thus some "atomicity" is required.Second, ->comm can contain whitespace and ')'.No, they are not escaped.Third, the only reliable way to check if process is kernel threadappears to be field #9 in /proc/*/stat.This field is struct task_struct::flags in decimal!Check is done by testing PF_KTHREAD flags like we do in kernel. PF_KTREAD value is a part of userspace ABI !!!Other methods for determining kernel threadness are not reliable:* RSS can be 0 if everything is swapped, even while reading from /proc/self.* ->total_vm CAN BE ZERO if process is finishing munmap(NULL, whole address space);* /proc/*/maps and similar files can be empty because unmapping everything works. Read returning 0 can't distinguish between kernel thread and such suicide process.Link: http://lkml.kernel.org/r/20180505000414.GA15090@avx2Signed-off-by: Alexey Dobriyan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds List of files: /linux-6.15/tools/testing/selftests/proc/fd-003-kthread.c

Changes in fd-003-kthread.c

0387662d - selftests: fix warning: "_GNU_SOURCE" redefined

b2f5de03 - tools/testing/selftests/proc: test /proc/*/fd a bit (+ PF_KTHREAD is ABI!)