linux-kernel - [PATCH v3 1/2] powerpc32/booke: consistently return phys_addr_t in _

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Date:   Mon,  6 Jan 2020 12:29:53 +0800
From:   yingjie_bai@....com
To:     Scott Wood <oss@...error.net>,
        Kumar Gala <galak@...nel.crashing.org>
Cc:     Bai Yingjie <byj.tea@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Jason Yan <yanaijie@...wei.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] powerpc32/booke: consistently return phys_addr_t in __pa()

From: Bai Yingjie <byj.tea@...il.com>

When CONFIG_RELOCATABLE=y is set, VIRT_PHYS_OFFSET is a 64bit variable,
thus __pa() returns as 64bit value.
But when CONFIG_RELOCATABLE=n, __pa() returns 32bit value.

When CONFIG_PHYS_64BIT is set, __pa() should consistently return as
64bit value irrelevant to CONFIG_RELOCATABLE.
So we'd make __pa() consistently return phys_addr_t, which is 64bit
when CONFIG_PHYS_64BIT is set.

Signed-off-by: Bai Yingjie <byj.tea@...il.com>
---
 arch/powerpc/include/asm/page.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 7f1fd41e3065..86332080399a 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -209,7 +209,7 @@ static inline bool pfn_valid(unsigned long pfn)
  */
 #if defined(CONFIG_PPC32) && defined(CONFIG_BOOKE)
 #define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
-#define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
+#define __pa(x) ((phys_addr_t)(unsigned long)(x) - VIRT_PHYS_OFFSET)
 #else
 #ifdef CONFIG_PPC64
 /*
-- 
2.17.1