linux-kernel - [PATCH 1/3 v9] x86/mm: Change the examination condition to avoid confusion

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Message-Id: <20190321103309.27883-2-lijiang@redhat.com>
Date:   Thu, 21 Mar 2019 18:33:07 +0800
From:   Lianbo Jiang <lijiang@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     kexec@...ts.infradead.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, akpm@...ux-foundation.org,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        x86@...nel.org, hpa@...or.com, dyoung@...hat.com, bhe@...hat.com,
        Thomas.Lendacky@....com
Subject: [PATCH 1/3 v9] x86/mm: Change the examination condition to avoid confusion

Following the commit <0e4c12b45aa8> ("x86/mm, resource: Use
PAGE_KERNEL protection for ioremap of memory pages"), here
it is really checking for the 'IORES_DESC_ACPI_*' values.
Therefore, it is necessary to change the examination condition
to avoid confusion.

Signed-off-by: Lianbo Jiang <lijiang@...hat.com>
---
 arch/x86/mm/ioremap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 0029604af8a4..0e3ba620612d 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -83,7 +83,8 @@ static bool __ioremap_check_ram(struct resource *res)
 
 static int __ioremap_check_desc_other(struct resource *res)
 {
-	return (res->desc != IORES_DESC_NONE);
+	return ((res->desc == IORES_DESC_ACPI_TABLES) ||
+		(res->desc == IORES_DESC_ACPI_NV_STORAGE));
 }
 
 static int __ioremap_res_check(struct resource *res, void *arg)
-- 
2.17.1