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f95d050cdc
When a host system has kernel headers that are newer than a compiling kernel, mksyscalltbl fails with errors such as: <stdin>: In function 'main': <stdin>:271:44: error: '__NR_kexec_file_load' undeclared (first use in this function) <stdin>:271:44: note: each undeclared identifier is reported only once for each function it appears in <stdin>:272:46: error: '__NR_pidfd_send_signal' undeclared (first use in this function) <stdin>:273:43: error: '__NR_io_uring_setup' undeclared (first use in this function) <stdin>:274:43: error: '__NR_io_uring_enter' undeclared (first use in this function) <stdin>:275:46: error: '__NR_io_uring_register' undeclared (first use in this function) tools/perf/arch/arm64/entry/syscalls//mksyscalltbl: line 48: /tmp/create-table-xvUQdD: Permission denied mksyscalltbl is compiled with default host includes, but run with compiling kernel tree includes, causing some syscall numbers to being undeclared. Committer testing: Before this patch, in my cross build environment, no build problems, but these new syscalls were not in the syscalls.c generated from the unistd.h file, which is a bug, this patch fixes it: perfbuilder@6e20056ed532:/git/perf$ tail /tmp/build/perf/arch/arm64/include/generated/asm/syscalls.c [292] = "io_pgetevents", [293] = "rseq", [294] = "kexec_file_load", [424] = "pidfd_send_signal", [425] = "io_uring_setup", [426] = "io_uring_enter", [427] = "io_uring_register", [428] = "syscalls", }; perfbuilder@6e20056ed532:/git/perf$ strings /tmp/build/perf/perf | egrep '^(io_uring_|pidfd_|kexec_file)' kexec_file_load pidfd_send_signal io_uring_setup io_uring_enter io_uring_register perfbuilder@6e20056ed532:/git/perf$ $ Well, there is that last "syscalls" thing, but that looks like some other bug. Signed-off-by: Vitaly Chikunov <vt@altlinux.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Tested-by: Michael Petlan <mpetlan@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Hendrik Brueckner <brueckner@linux.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/20190521030203.1447-1-vt@altlinux.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.