Make several functions that return 0 or 1 return a boolean value for
better readability.

No functional changes are intended.

Reviewed-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
---
 arch/x86/include/asm/mce.h      |  4 ++--
 arch/x86/kernel/cpu/mce/amd.c   | 10 +++++-----
 arch/x86/kernel/cpu/mce/core.c  | 22 +++++++++++-----------
 arch/x86/kernel/cpu/mce/intel.c |  9 +++++----
 4 files changed, 23 insertions(+), 22 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 3b9970117a0f..7a01bb5b19d3 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -244,7 +244,7 @@ static inline void cmci_rediscover(void) {}
 static inline void cmci_recheck(void) {}
 #endif
 
-int mce_available(struct cpuinfo_x86 *c);
+bool mce_available(struct cpuinfo_x86 *c);
 bool mce_is_memory_error(struct mce *m);
 bool mce_is_correctable(struct mce *m);
 bool mce_usable_address(struct mce *m);
@@ -264,7 +264,7 @@ enum mcp_flags {
 
 void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 
-int mce_notify_irq(void);
+bool mce_notify_irq(void);
 
 DECLARE_PER_CPU(struct mce, injectm);
 
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 14bf8c232e45..4dae9841ee38 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -381,7 +381,7 @@ static bool lvt_interrupt_supported(unsigned int bank, u32 msr_high_bits)
 	return msr_high_bits & BIT(28);
 }
 
-static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
+static bool lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
 {
 	int msr = (hi & MASK_LVTOFF_HI) >> 20;
 
@@ -389,7 +389,7 @@ static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
 		pr_err(FW_BUG "cpu %d, failed to setup threshold interrupt "
 		       "for bank %d, block %d (MSR%08X=0x%x%08x)\n", b->cpu,
 		       b->bank, b->block, b->address, hi, lo);
-		return 0;
+		return false;
 	}
 
 	if (apic != msr) {
@@ -399,15 +399,15 @@ static int lvt_off_valid(struct threshold_block *b, int apic, u32 lo, u32 hi)
 		 * was set is reserved. Return early here:
 		 */
 		if (mce_flags.smca)
-			return 0;
+			return false;
 
 		pr_err(FW_BUG "cpu %d, invalid threshold interrupt offset %d "
 		       "for bank %d, block %d (MSR%08X=0x%x%08x)\n",
 		       b->cpu, apic, b->bank, b->block, b->address, hi, lo);
-		return 0;
+		return false;
 	}
 
-	return 1;
+	return true;
 };
 
 /* Reprogram MCx_MISC MSR behind this threshold bank. */
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 2a938f429c4d..725c1d6fb1e5 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -479,10 +479,10 @@ static noinstr void mce_gather_info(struct mce *m, struct pt_regs *regs)
 	}
 }
 
-int mce_available(struct cpuinfo_x86 *c)
+bool mce_available(struct cpuinfo_x86 *c)
 {
 	if (mca_cfg.disabled)
-		return 0;
+		return false;
 	return cpu_has(c, X86_FEATURE_MCE) && cpu_has(c, X86_FEATURE_MCA);
 }
 
@@ -1748,7 +1748,7 @@ static void mce_timer_delete_all(void)
  * Can be called from interrupt context, but not from machine check/NMI
  * context.
  */
-int mce_notify_irq(void)
+bool mce_notify_irq(void)
 {
 	/* Not more than two messages every minute */
 	static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
@@ -1759,9 +1759,9 @@ int mce_notify_irq(void)
 		if (__ratelimit(&ratelimit))
 			pr_info(HW_ERR "Machine check events logged\n");
 
-		return 1;
+		return true;
 	}
-	return 0;
+	return false;
 }
 EXPORT_SYMBOL_GPL(mce_notify_irq);
 
@@ -1985,25 +1985,25 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 	return 0;
 }
 
-static int __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
+static bool __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
 {
 	if (c->x86 != 5)
-		return 0;
+		return false;
 
 	switch (c->x86_vendor) {
 	case X86_VENDOR_INTEL:
 		intel_p5_mcheck_init(c);
 		mce_flags.p5 = 1;
-		return 1;
+		return true;
 	case X86_VENDOR_CENTAUR:
 		winchip_mcheck_init(c);
 		mce_flags.winchip = 1;
-		return 1;
+		return true;
 	default:
-		return 0;
+		return false;
 	}
 
-	return 0;
+	return false;
 }
 
 /*
diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c
index b3cd2c61b11d..f863df0ff42c 100644
--- a/arch/x86/kernel/cpu/mce/intel.c
+++ b/arch/x86/kernel/cpu/mce/intel.c
@@ -75,12 +75,12 @@ static u16 cmci_threshold[MAX_NR_BANKS];
  */
 #define CMCI_STORM_THRESHOLD	32749
 
-static int cmci_supported(int *banks)
+static bool cmci_supported(int *banks)
 {
 	u64 cap;
 
 	if (mca_cfg.cmci_disabled || mca_cfg.ignore_ce)
-		return 0;
+		return false;
 
 	/*
 	 * Vendor check is not strictly needed, but the initial
@@ -89,10 +89,11 @@ static int cmci_supported(int *banks)
 	 */
 	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL &&
 	    boot_cpu_data.x86_vendor != X86_VENDOR_ZHAOXIN)
-		return 0;
+		return false;
 
 	if (!boot_cpu_has(X86_FEATURE_APIC) || lapic_get_maxlvt() < 6)
-		return 0;
+		return false;
+
 	rdmsrl(MSR_IA32_MCG_CAP, cap);
 	*banks = min_t(unsigned, MAX_NR_BANKS, cap & MCG_BANKCNT_MASK);
 	return !!(cap & MCG_CMCI_P);
-- 
2.17.1

On 10/16/2024 5:30 AM, Qiuxu Zhuo wrote:

> @@ -1748,7 +1748,7 @@ static void mce_timer_delete_all(void)
>   * Can be called from interrupt context, but not from machine check/NMI
>   * context.
>   */
> -int mce_notify_irq(void)
> +bool mce_notify_irq(void)
>  {
>  	/* Not more than two messages every minute */
>  	static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
> @@ -1759,9 +1759,9 @@ int mce_notify_irq(void)
>  		if (__ratelimit(&ratelimit))
>  			pr_info(HW_ERR "Machine check events logged\n");
>  
> -		return 1;
> +		return true;
>  	}
> -	return 0;
> +	return false;
>  }
>  EXPORT_SYMBOL_GPL(mce_notify_irq);
>  

I am slightly confused by the function name mce_notify_irq() and the
boolean meaning. Would it better to rename this function to
mce_notify_user()? As the comment suggests on top, it purpose doesn't
seem to be irq related but to mainly notify the user.

Also, the boolean would probably make more sense then:
	True -> Notified the user
	False -> Did not notify the user

> From: Mehta, Sohil <sohil.mehta@intel.com>
> [...]
> > @@ -1748,7 +1748,7 @@ static void mce_timer_delete_all(void)
> >   * Can be called from interrupt context, but not from machine check/NMI
> >   * context.
> >   */
> > -int mce_notify_irq(void)
> > +bool mce_notify_irq(void)
> >  {
> >  	/* Not more than two messages every minute */
> >  	static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2); @@ -1759,9
> > +1759,9 @@ int mce_notify_irq(void)
> >  		if (__ratelimit(&ratelimit))
> >  			pr_info(HW_ERR "Machine check events logged\n");
> >
> > -		return 1;
> > +		return true;
> >  	}
> > -	return 0;
> > +	return false;
> >  }
> >  EXPORT_SYMBOL_GPL(mce_notify_irq);
> >
> 
> I am slightly confused by the function name mce_notify_irq() and the boolean
> meaning. Would it better to rename this function to mce_notify_user()? As 
> the comment suggests on top, it purpose doesn't seem to be irq related but
> to mainly notify the user.
> Also, the boolean would probably make more sense then:
> 	True -> Notified the user
> 	False -> Did not notify the user

Agree. mce_notify_user() better reflects what it does.
If nobody else objects to it, I'll update the function name in the next version.

Thanks!
-Qiuxu