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tools compiler.h: Add attribute to disable tail calls

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Tail call optimizations can remove stack frames that are used in
unwinding tests. Add an attribute that can be used to disable the tail
call optimization. Tested  on clang and GCC.

Committer notes:

Old versions of clang don't like that __attribute__((optimize)), so add
an ifdef to make it go away.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: clang-built-linux@googlegroups.com
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20200530082015.39162-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2020-05-30 01:20:13 -07:00 • committed by Arnaldo Carvalho de Melo
parent 9300acc6fe
commit 21f2b7c133
2 changed files with 15 additions and 0 deletions
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12
tools/include/linux/compiler-gcc.h
View file

@ -27,6 +27,18 @@
#define __pure __attribute__((pure))
#endif
#define noinline __attribute__((noinline))
#ifdef __has_attribute
#if __has_attribute(disable_tail_calls)
#define __no_tail_call __attribute__((disable_tail_calls))
#endif
#endif
#ifndef __no_tail_call
#if GCC_VERSION > 40201
#define __no_tail_call __attribute__((optimize("no-optimize-sibling-calls")))
#else
#define __no_tail_call
#endif
#endif
#ifndef __packed
#define __packed __attribute__((packed))
#endif