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objtool: Support GCC 9 cold subfunction naming scheme

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Starting with GCC 8, a lot of unlikely code was moved out of line to
"cold" subfunctions in .text.unlikely.

For example, the unlikely bits of:

  irq_do_set_affinity()

are moved out to the following subfunction:

  irq_do_set_affinity.cold.49()

Starting with GCC 9, the numbered suffix has been removed.  So in the
above example, the cold subfunction is instead:

  irq_do_set_affinity.cold()

Tweak the objtool subfunction detection logic so that it detects both
GCC 8 and GCC 9 naming schemes.

Reported-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/015e9544b1f188d36a7f02fa31e9e95629aa5f50.1541040800.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2018-10-31 21:57:30 -05:00 committed by Thomas Gleixner
parent 5b7449810a
commit bcb6fb5da7
1 changed files with 1 additions and 1 deletions
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2
tools/objtool/elf.c
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@ -301,7 +301,7 @@ static int read_symbols(struct elf *elf)
if (sym->type != STT_FUNC) if (sym->type != STT_FUNC)
continue; continue;
sym->pfunc = sym->cfunc = sym; sym->pfunc = sym->cfunc = sym;
coldstr = strstr(sym->name, ".cold."); coldstr = strstr(sym->name, ".cold");
if (!coldstr) if (!coldstr)
continue; continue;