arm64: cpufeature: add POE to cpucap_is_possible()

Since de66cb3 ("arm64: Add cpucap_is_possible()"),
alternative_has_cap_unlikely() includes the IS_ENABLED() check.

Add CONFIG_ARM64_POE to cpucap_is_possible() to avoid the explicit check.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20241008140121.2774348-1-joey.gouly@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Author: jgouly

arch/arm64/include/asm/cpucaps.h

@@ -42,6 +42,8 @@ cpucap_is_possible(const unsigned int cap)
 		return IS_ENABLED(CONFIG_ARM64_BTI);
 	case ARM64_HAS_TLB_RANGE:
 		return IS_ENABLED(CONFIG_ARM64_TLB_RANGE);
+	case ARM64_HAS_S1POE:
+		return IS_ENABLED(CONFIG_ARM64_POE);
 	case ARM64_UNMAP_KERNEL_AT_EL0:
 		return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0);
 	case ARM64_WORKAROUND_843419:

arch/arm64/include/asm/cpufeature.h

@@ -834,8 +834,7 @@ static inline bool system_supports_lpa2(void)
 
 static inline bool system_supports_poe(void)
 {
-	return IS_ENABLED(CONFIG_ARM64_POE) &&
-		alternative_has_cap_unlikely(ARM64_HAS_S1POE);
+	return alternative_has_cap_unlikely(ARM64_HAS_S1POE);
 }
 
 int do_emulate_mrs(struct pt_regs *regs, u32 sys_reg, u32 rt);