objtool: Support GCC 9 cold subfunction naming scheme
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
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@ -301,7 +301,7 @@ static int read_symbols(struct elf *elf)
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if (sym->type != STT_FUNC)
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continue;
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sym->pfunc = sym->cfunc = sym;
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coldstr = strstr(sym->name, ".cold.");
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coldstr = strstr(sym->name, ".cold");
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if (!coldstr)
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continue;
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