x86/mce: Make four functions return bool

Make those functions whose callers only care about success or failure return
a boolean value for better readability. Also, update the call sites
accordingly as the polarities of all the return values have been flipped.

No functional changes.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Sohil Mehta <sohil.mehta@intel.com>
Reviewed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lore.kernel.org/r/20241212140103.66964-4-qiuxu.zhuo@intel.com

Author: qzhuo2

arch/x86/kernel/cpu/mce/core.c

@@ -151,7 +151,7 @@ EXPORT_PER_CPU_SYMBOL_GPL(injectm);
 
 void mce_log(struct mce_hw_err *err)
 {
-	if (!mce_gen_pool_add(err))
+	if (mce_gen_pool_add(err))
 		irq_work_queue(&mce_irq_work);
 }
 EXPORT_SYMBOL_GPL(mce_log);
@@ -1911,14 +1911,14 @@ static void __mcheck_cpu_check_banks(void)
 }
 
 /* Add per CPU specific workarounds here */
-static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
+static bool __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 {
 	struct mce_bank *mce_banks = this_cpu_ptr(mce_banks_array);
 	struct mca_config *cfg = &mca_cfg;
 
 	if (c->x86_vendor == X86_VENDOR_UNKNOWN) {
 		pr_info("unknown CPU type - not enabling MCE support\n");
-		return -EOPNOTSUPP;
+		return false;
 	}
 
 	/* This should be disabled by the BIOS, but isn't always */
@@ -2012,7 +2012,7 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 	if (cfg->bootlog != 0)
 		cfg->panic_timeout = 30;
 
-	return 0;
+	return true;
 }
 
 static bool __mcheck_cpu_ancient_init(struct cpuinfo_x86 *c)
@@ -2279,12 +2279,12 @@ void mcheck_cpu_init(struct cpuinfo_x86 *c)
 
 	__mcheck_cpu_cap_init();
 
-	if (__mcheck_cpu_apply_quirks(c) < 0) {
+	if (!__mcheck_cpu_apply_quirks(c)) {
 		mca_cfg.disabled = 1;
 		return;
 	}
 
-	if (mce_gen_pool_init()) {
+	if (!mce_gen_pool_init()) {
 		mca_cfg.disabled = 1;
 		pr_emerg("Couldn't allocate MCE records pool!\n");
 		return;

arch/x86/kernel/cpu/mce/genpool.c

@@ -94,64 +94,63 @@ bool mce_gen_pool_empty(void)
 	return llist_empty(&mce_event_llist);
 }
 
-int mce_gen_pool_add(struct mce_hw_err *err)
+bool mce_gen_pool_add(struct mce_hw_err *err)
 {
 	struct mce_evt_llist *node;
 
 	if (filter_mce(&err->m))
-		return -EINVAL;
+		return false;
 
 	if (!mce_evt_pool)
-		return -EINVAL;
+		return false;
 
 	node = (void *)gen_pool_alloc(mce_evt_pool, sizeof(*node));
 	if (!node) {
 		pr_warn_ratelimited("MCE records pool full!\n");
-		return -ENOMEM;
+		return false;
 	}
 
 	memcpy(&node->err, err, sizeof(*err));
 	llist_add(&node->llnode, &mce_event_llist);
 
-	return 0;
+	return true;
 }
 
-static int mce_gen_pool_create(void)
+static bool mce_gen_pool_create(void)
 {
 	int mce_numrecords, mce_poolsz, order;
 	struct gen_pool *gpool;
-	int ret = -ENOMEM;
 	void *mce_pool;
 
 	order = order_base_2(sizeof(struct mce_evt_llist));
 	gpool = gen_pool_create(order, -1);
 	if (!gpool)
-		return ret;
+		return false;
 
 	mce_numrecords = max(MCE_MIN_ENTRIES, num_possible_cpus() * MCE_PER_CPU);
 	mce_poolsz = mce_numrecords * (1 << order);
 	mce_pool = kmalloc(mce_poolsz, GFP_KERNEL);
 	if (!mce_pool) {
 		gen_pool_destroy(gpool);
-		return ret;
+		return false;
 	}
-	ret = gen_pool_add(gpool, (unsigned long)mce_pool, mce_poolsz, -1);
-	if (ret) {
+
+	if (gen_pool_add(gpool, (unsigned long)mce_pool, mce_poolsz, -1)) {
 		gen_pool_destroy(gpool);
 		kfree(mce_pool);
-		return ret;
+		return false;
 	}
 
 	mce_evt_pool = gpool;
 
-	return ret;
+	return true;
 }
 
-int mce_gen_pool_init(void)
+bool mce_gen_pool_init(void)
 {
 	/* Just init mce_gen_pool once. */
 	if (mce_evt_pool)
-		return 0;
+		return true;
 
 	return mce_gen_pool_create();
 }

arch/x86/kernel/cpu/mce/internal.h

@@ -31,8 +31,8 @@ struct mce_evt_llist {
 
 void mce_gen_pool_process(struct work_struct *__unused);
 bool mce_gen_pool_empty(void);
-int mce_gen_pool_add(struct mce_hw_err *err);
-int mce_gen_pool_init(void);
+bool mce_gen_pool_add(struct mce_hw_err *err);
+bool mce_gen_pool_init(void);
 struct llist_node *mce_gen_pool_prepare_records(void);
 
 int mce_severity(struct mce *a, struct pt_regs *regs, char **msg, bool is_excp);