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This patch isn't intended to have any effect on the compiled code. It just removes one level of indirection: calling the *host* compiler to build and then run a program that just printf:s the numerical entries of the syscall-table. In other words, the generated syscalls.c changes from: [46] = "ftruncate", to: [__NR3264_ftruncate] = "ftruncate", The latter is as good as the former to the user of perf, and this can be done directly by the shell-script. The syscalls defined as non-literal values (like "#define __NR_ftruncate __NR3264_ftruncate") are trivially resolved at compile-time without namespace-leaking and/or collision for its sole user, perf/util/syscalltbl.c, that just #includes the generated file. A future "-mabi=32" support would probably have to handle this differently, but that is a pre-existing problem not affected by this simplification. Calling the *host* compiler only complicates things and accidentally can get a completely wrong set of files and syscall numbers, see earlier commits. Note that the script parameter hostcc is now unused. At the time of this patch, powerpc (the origin, see comments), and also e.g. x86 has moved on, from filtering "gcc -dM -E" output to reading separate specific text-file, a table of syscall numbers. IMHO should arm64 consider adopting this. Signed-off-by: Hans-Peter Nilsson <hp@axis.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reviewed-by: Leo Yan <leo.yan@linaro.org> Tested-by: Leo Yan <leo.yan@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: John Garry <john.garry@huawei.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Leo Yan <leo.yan@linaro.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will@kernel.org> Cc: linux-arm-kernel@lists.infradead.org Link: https://lore.kernel.org/r/20201228024159.2BB66203B5@pchp3.se.axis.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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| .. | ||
| arch | ||
| bench | ||
| dlfilters | ||
| Documentation | ||
| examples/bpf | ||
| include/perf | ||
| jvmti | ||
| pmu-events | ||
| python | ||
| scripts | ||
| tests | ||
| trace | ||
| ui | ||
| util | ||
| .gitignore | ||
| Build | ||
| builtin-annotate.c | ||
| builtin-bench.c | ||
| builtin-buildid-cache.c | ||
| builtin-buildid-list.c | ||
| builtin-c2c.c | ||
| builtin-config.c | ||
| builtin-daemon.c | ||
| builtin-data.c | ||
| builtin-diff.c | ||
| builtin-evlist.c | ||
| builtin-ftrace.c | ||
| builtin-help.c | ||
| builtin-inject.c | ||
| builtin-kallsyms.c | ||
| builtin-kmem.c | ||
| builtin-kvm.c | ||
| builtin-kwork.c | ||
| builtin-list.c | ||
| builtin-lock.c | ||
| builtin-mem.c | ||
| builtin-probe.c | ||
| builtin-record.c | ||
| builtin-report.c | ||
| builtin-sched.c | ||
| builtin-script.c | ||
| builtin-stat.c | ||
| builtin-timechart.c | ||
| builtin-top.c | ||
| builtin-trace.c | ||
| builtin-version.c | ||
| builtin.h | ||
| check-headers.sh | ||
| command-list.txt | ||
| CREDITS | ||
| design.txt | ||
| Makefile | ||
| Makefile.config | ||
| Makefile.perf | ||
| MANIFEST | ||
| perf-archive.sh | ||
| perf-completion.sh | ||
| perf-iostat.sh | ||
| perf-read-vdso.c | ||
| perf-sys.h | ||
| perf.c | ||
| perf.h | ||