[03/13] MIPS: cpu-probe: ingenic: Fix broken BUG_ON
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Message ID 20200803170124.231110-4-paul@crapouillou.net
State Superseded
Headers show
Series
  • MIPS: Convert Ingenic to a generic board
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Commit Message

Paul Cercueil Aug. 3, 2020, 5:01 p.m. UTC
The previous code was doing:
BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);

This only worked as the "cpu_has_counter" macro was overridden in
<cpu-feature-overrides.h>. The default "cpu_has_counter" macro is
non-constant, which triggered the BUG_ON() independently of the value
returned by the macro.

What we want to check here, is that *if* the macro was overridden to a
compile-time constant, then must be defined to zero, otherwise it's a
bug.

So the correct check is:
BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter);

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
 arch/mips/kernel/cpu-probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch
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diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index a07e66a6e063..6be23f205e74 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -2123,7 +2123,7 @@  static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
 
 	/* XBurst does not implement the CP0 counter. */
 	c->options &= ~MIPS_CPU_COUNTER;
-	BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter);
+	BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter);
 
 	/* XBurst has virtually tagged icache */
 	c->icache.flags |= MIPS_CACHE_VTAG;