linux-kernel - [PATCH] hpwdt: clean up set_memory

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Date:	Sun, 15 Jan 2012 20:02:50 -0800
From:	Maxim Uvarov <maxim.uvarov@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, wim@...ana.be,
	torvalds@...ux-foundation.org, stable@...r.kernel.org,
	Thomas.Mingarelli@...com, Maxim Uvarov <maxim.uvarov@...cle.com>
Subject: [PATCH] hpwdt: clean up set_memory_x call for 32 bit

1. addess has to be page aligned.
2. set_memory_x uses page size argument, not size.
Bug causes with following commit:
	commit da28179b4e90dda56912ee825c7eaa62fc103797
	Author: Mingarelli, Thomas <Thomas.Mingarelli@...com>
	Date:   Mon Nov 7 10:59:00 2011 +0100

     watchdog: hpwdt: Changes to handle NX secure bit in 32bit path

    commit e67d668e147c3b4fec638c9e0ace04319f5ceccd upstream.

    This patch makes use of the set_memory_x() kernel API in order
    to make necessary BIOS calls to source NMIs.

Signed-off-by: Maxim Uvarov <maxim.uvarov@...cle.com>
---
 drivers/watchdog/hpwdt.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 9cb60df..7f04d37 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -216,7 +216,7 @@ static int __devinit cru_detect(unsigned long map_entry,
 
 	cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
 
-	set_memory_x((unsigned long)bios32_entrypoint, (2 * PAGE_SIZE));
+	set_memory_x((unsigned long)bios32_entrypoint & PAGE_MASK, 2);
 	asminline_call(&cmn_regs, bios32_entrypoint);
 
 	if (cmn_regs.u1.ral != 0) {
@@ -235,7 +235,7 @@ static int __devinit cru_detect(unsigned long map_entry,
 			cru_rom_addr =
 				ioremap(cru_physical_address, cru_length);
 			if (cru_rom_addr) {
-				set_memory_x((unsigned long)cru_rom_addr, cru_length);
+				set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK, cru_length >> PAGE_SHIFT);
 				retval = 0;
 			}
 		}
-- 
1.7.4.1

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