linux-kernel - [PATCH v2 1/2] x86/mm: rename the confusing local variable in early_memremap_is_setup

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Message-ID: <20240829104016.84139-2-bhe@redhat.com>
Date: Thu, 29 Aug 2024 18:40:15 +0800
From: Baoquan He <bhe@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: thomas.lendacky@....com,
	dyoung@...hat.com,
	daniel.kiper@...cle.com,
	noodles@...com,
	lijiang@...hat.com,
	kexec@...ts.infradead.org,
	Baoquan He <bhe@...hat.com>
Subject: [PATCH v2 1/2] x86/mm: rename the confusing local variable in early_memremap_is_setup_data()

In function early_memremap_is_setup_data(), parameter 'size' passed has
the same name as the local variable inside the while loop. That
confuses people who sometime mix up them when reading code.

Here rename the local variable 'size' inside while loop to 'sd_size'.

And also add one local variable 'sd_size' likewise in function
memremap_is_setup_data() to simplify code. In later patch, this can also
be used.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/x86/mm/ioremap.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index aa7d279321ea..f1ee8822ddf1 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -640,7 +640,7 @@ static bool memremap_is_setup_data(resource_size_t phys_addr,
 
 	paddr = boot_params.hdr.setup_data;
 	while (paddr) {
-		unsigned int len;
+		unsigned int len, sd_size;
 
 		if (phys_addr == paddr)
 			return true;
@@ -652,6 +652,8 @@ static bool memremap_is_setup_data(resource_size_t phys_addr,
 			return false;
 		}
 
+		sd_size = sizeof(*data);
+
 		paddr_next = data->next;
 		len = data->len;
 
@@ -662,7 +664,9 @@ static bool memremap_is_setup_data(resource_size_t phys_addr,
 
 		if (data->type == SETUP_INDIRECT) {
 			memunmap(data);
-			data = memremap(paddr, sizeof(*data) + len,
+
+			sd_size += len;
+			data = memremap(paddr, sd_size,
 					MEMREMAP_WB | MEMREMAP_DEC);
 			if (!data) {
 				pr_warn("failed to memremap indirect setup_data\n");
@@ -701,7 +705,7 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
 
 	paddr = boot_params.hdr.setup_data;
 	while (paddr) {
-		unsigned int len, size;
+		unsigned int len, sd_size;
 
 		if (phys_addr == paddr)
 			return true;
@@ -712,7 +716,7 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
 			return false;
 		}
 
-		size = sizeof(*data);
+		sd_size = sizeof(*data);
 
 		paddr_next = data->next;
 		len = data->len;
@@ -723,9 +727,9 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
 		}
 
 		if (data->type == SETUP_INDIRECT) {
-			size += len;
+			sd_size += len;
 			early_memunmap(data, sizeof(*data));
-			data = early_memremap_decrypted(paddr, size);
+			data = early_memremap_decrypted(paddr, sd_size);
 			if (!data) {
 				pr_warn("failed to early memremap indirect setup_data\n");
 				return false;
@@ -739,7 +743,7 @@ static bool __init early_memremap_is_setup_data(resource_size_t phys_addr,
 			}
 		}
 
-		early_memunmap(data, size);
+		early_memunmap(data, sd_size);
 
 		if ((phys_addr > paddr) && (phys_addr < (paddr + len)))
 			return true;
-- 
2.41.0