From: Josh Poimboeuf jpoimboe@redhat.com
commit bcb6fb5da77c2a228adf07cc9cb1a0c2aa2001c6 upstream.
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/015e9544b1f188d36a7f02fa31e9e95629aa5f50.154104080... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- tools/objtool/elf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -305,7 +305,7 @@ static int read_symbols(struct elf *elf) if (sym->type != STT_FUNC) continue; sym->pfunc = sym->cfunc = sym; - coldstr = strstr(sym->name, ".cold."); + coldstr = strstr(sym->name, ".cold"); if (!coldstr) continue;