mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-01 23:04:54 +01:00
Leo Yan
e7e86d7697
When build with perl5, it reports error:
In file included from /usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:7933:
/usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/inline.h:298:5: error:
mutex 'PL_env_mutex.lock' is not held on every path through
here [-Werror,-Wthread-safety-analysis]
298 | ENV_UNLOCK;
| ^
/usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:7091:31: note:
expanded from macro 'ENV_UNLOCK'
7091 | # define ENV_UNLOCK PERL_REENTRANT_UNLOCK("env"...
| ^
/usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:6465:7: note:
expanded from macro 'PERL_REENTRANT_UNLOCK'
6465 | } STMT_END
| ^
/usr/lib/perl5/5.42.0/x86_64-linux-thread-multi/CORE/perl.h:865:28: note:
expanded from macro 'STMT_END'
865 | # define STMT_END while (0)
| ^
The error is caused by perl header but not perf code, disable thread
safety analysis if including the header.
Though GCC does not support the thread safety analysis option, this
negative warning flag is silently ignored by it.
Signed-off-by: Leo Yan <[email protected]>
Reviewed-by: Ian Rogers <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: Palmer Dabbelt <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexandre Ghiti <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: Justin Stitt <[email protected]>
Cc: Bill Wendling <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: James Clark <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Paul Walmsley <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
Perf-Trace-Util version 0.01 ============================ This module contains utility functions for use with perf script. Core.pm and Util.pm are pure Perl modules; Core.pm contains routines that the core perf support for Perl calls on and should always be 'used', while Util.pm contains useful but optional utility functions that scripts may want to use. Context.pm contains the Perl->C interface that allows scripts to access data in the embedding perf executable; scripts wishing to do that should 'use Context.pm'. The Perl->C perf interface is completely driven by Context.xs. If you want to add new Perl functions that end up accessing C data in the perf executable, you add desciptions of the new functions here. scripting_context is a pointer to the perf data in the perf executable that you want to access - it's passed as the second parameter, $context, to all handler functions. After you do that: perl Makefile.PL # to create a Makefile for the next step make # to create Context.c edit Context.c to add const to the char* file = __FILE__ line in XS(boot_Perf__Trace__Context) to silence a warning/error. You can delete the Makefile, object files and anything else that was generated e.g. blib and shared library, etc, except for of course Context.c You should then be able to run the normal perf make as usual. INSTALLATION Building perf with perf script Perl scripting should install this module in the right place. You should make sure libperl and ExtUtils/Embed.pm are installed first e.g. apt-get install libperl-dev or yum install perl-ExtUtils-Embed. DEPENDENCIES This module requires these other modules and libraries: None COPYRIGHT AND LICENCE Copyright (C) 2009 by Tom Zanussi <[email protected]> This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.0 or, at your option, any later version of Perl 5 you may have available. Alternatively, this software may be distributed under the terms of the GNU General Public License ("GPL") version 2 as published by the Free Software Foundation.