linux-kernel - [tip:x86/mm] x86, setup: Let early_memremap() handle page alignment

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Date:	Fri, 23 Jan 2015 07:18:36 -0800
From:	tip-bot for WANG Chao <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com,
	pure.logic@...us-software.ie, matt.fleming@...el.com,
	chaowang@...hat.com, tglx@...utronix.de, santosh.shilimkar@...com,
	bp@...e.de, mingo@...nel.org
Subject: [tip:x86/mm] x86, setup: Let early_memremap()
  handle page alignment

Commit-ID:  7389882c81474d635a208726edb22938645ff9ad
Gitweb:     http://git.kernel.org/tip/7389882c81474d635a208726edb22938645ff9ad
Author:     WANG Chao <chaowang@...hat.com>
AuthorDate: Wed, 7 Jan 2015 18:55:48 +0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 23 Jan 2015 16:14:26 +0100

x86, setup: Let early_memremap() handle page alignment

early_memremap() takes care of page alignment and map size, so we can
just remap the required data size and get rid of the adjustments in
the setup code.

[tglx: Massaged changelog ]

Signed-off-by: WANG Chao <chaowang@...hat.com>
Cc: Matt Fleming <matt.fleming@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Santosh Shilimkar <santosh.shilimkar@...com>
Cc: Bryan O'Donoghue <pure.logic@...us-software.ie>
Link: http://lkml.kernel.org/r/1420628150-16872-1-git-send-email-chaowang@redhat.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/setup.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index ab4734e..c4648ada 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -431,15 +431,13 @@ static void __init parse_setup_data(void)
 
 	pa_data = boot_params.hdr.setup_data;
 	while (pa_data) {
-		u32 data_len, map_len, data_type;
+		u32 data_len, data_type;
 
-		map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
-			      (u64)sizeof(struct setup_data));
-		data = early_memremap(pa_data, map_len);
+		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, map_len);
+		early_iounmap(data, sizeof(*data));
 
 		switch (data_type) {
 		case SETUP_E820_EXT:
--
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