linux-kernel - [PATCH 2/2] x86: add macro for_each_setup

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Date:	Wed,  7 Jan 2015 18:55:49 +0800
From:	WANG Chao <chaowang@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	x86@...nel.org (maintainer:X86 ARCHITECTURE...),
	Matt Fleming <matt.fleming@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Borislav Petkov <bp@...e.de>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	"Bryan O'Donoghue" <pure.logic@...us-software.ie>,
	linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE...)
Subject: [PATCH 2/2] x86: add macro for_each_setup_data()

A common task for parsing setup_data is to iterate over setup_data's
linked list, remap and do something and unmap. Now add macro
for_each_setup_data() to do that.

Signed-off-by: WANG Chao <chaowang@...hat.com>
---
 arch/x86/kernel/setup.c | 37 ++++++++++++-------------------------
 1 file changed, 12 insertions(+), 25 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index c4648ada..1e24c37 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -424,35 +424,30 @@ static void __init reserve_initrd(void)
 }
 #endif /* CONFIG_BLK_DEV_INITRD */
 
+#define for_each_setup_data(pa_data, data) \
+	for (pa_data = boot_params.hdr.setup_data; \
+		pa_data && (data = early_memremap(pa_data, sizeof(*data))); \
+		pa_data = data->next, early_iounmap(data, sizeof(*data)))
+
 static void __init parse_setup_data(void)
 {
 	struct setup_data *data;
-	u64 pa_data, pa_next;
-
-	pa_data = boot_params.hdr.setup_data;
-	while (pa_data) {
-		u32 data_len, data_type;
-
-		data = early_memremap(pa_data, sizeof(*data));
-		data_len = data->len + sizeof(struct setup_data);
-		data_type = data->type;
-		pa_next = data->next;
-		early_iounmap(data, sizeof(*data));
+	u64 pa_data;
 
-		switch (data_type) {
+	for_each_setup_data(pa_data, data) {
+		switch (data->type) {
 		case SETUP_E820_EXT:
-			parse_e820_ext(pa_data, data_len);
+			parse_e820_ext(pa_data, data->len + sizeof(*data));
 			break;
 		case SETUP_DTB:
 			add_dtb(pa_data);
 			break;
 		case SETUP_EFI:
-			parse_efi_setup(pa_data, data_len);
+			parse_efi_setup(pa_data, data->len + sizeof(*data));
 			break;
 		default:
 			break;
 		}
-		pa_data = pa_next;
 	}
 }
 
@@ -462,14 +457,10 @@ static void __init e820_reserve_setup_data(void)
 	u64 pa_data;
 	int found = 0;
 
-	pa_data = boot_params.hdr.setup_data;
-	while (pa_data) {
-		data = early_memremap(pa_data, sizeof(*data));
+	for_each_setup_data(pa_data, data) {
 		e820_update_range(pa_data, sizeof(*data)+data->len,
 			 E820_RAM, E820_RESERVED_KERN);
 		found = 1;
-		pa_data = data->next;
-		early_iounmap(data, sizeof(*data));
 	}
 	if (!found)
 		return;
@@ -485,12 +476,8 @@ static void __init memblock_x86_reserve_range_setup_data(void)
 	struct setup_data *data;
 	u64 pa_data;
 
-	pa_data = boot_params.hdr.setup_data;
-	while (pa_data) {
-		data = early_memremap(pa_data, sizeof(*data));
+	for_each_setup_data(pa_data, data) {
 		memblock_reserve(pa_data, sizeof(*data) + data->len);
-		pa_data = data->next;
-		early_iounmap(data, sizeof(*data));
 	}
 }
 
-- 
2.1.0

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