linux-kernel - [PATCH] s390/io: Fix ioremap and iounmap undefinded issue for s390

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Message-Id: <20210903080316.2808017-1-zhang.lyra@gmail.com>
Date:   Fri,  3 Sep 2021 16:03:16 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Vasily Gorbik <gor@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Sebastian Ott <sebott@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:     linux-s390@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] s390/io: Fix ioremap and iounmap undefinded issue for s390

From: Chunyan Zhang <chunyan.zhang@...soc.com>

There would not be ioremap and iounmap implementations if CONFIG_PCI is
not set for s390, so add default declarations of these two functions
for the case to avoid 'undefined reference' issue.

Fixes: 71ba41c9b1d9 ("s390/pci: provide support for MIO instructions")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
The issue was reported from https://lkml.org/lkml/2021/8/1/18
---
 arch/s390/include/asm/io.h | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/s390/include/asm/io.h b/arch/s390/include/asm/io.h
index e3882b012bfa..9438370c6445 100644
--- a/arch/s390/include/asm/io.h
+++ b/arch/s390/include/asm/io.h
@@ -23,11 +23,8 @@ void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
 #define IO_SPACE_LIMIT 0
 
 void __iomem *ioremap_prot(phys_addr_t addr, size_t size, unsigned long prot);
-void __iomem *ioremap(phys_addr_t addr, size_t size);
 void __iomem *ioremap_wc(phys_addr_t addr, size_t size);
 void __iomem *ioremap_wt(phys_addr_t addr, size_t size);
-void iounmap(volatile void __iomem *addr);
-
 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
 {
 	return NULL;
@@ -39,6 +36,9 @@ static inline void ioport_unmap(void __iomem *p)
 
 #ifdef CONFIG_PCI
 
+void __iomem *ioremap(phys_addr_t addr, size_t size);
+void iounmap(volatile void __iomem *addr);
+
 /*
  * s390 needs a private implementation of pci_iomap since ioremap with its
  * offset parameter isn't sufficient. That's because BAR spaces are not
@@ -70,6 +70,15 @@ static inline void ioport_unmap(void __iomem *p)
 #define __raw_writel	zpci_write_u32
 #define __raw_writeq	zpci_write_u64
 
+#else
+static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
+{
+	return (void __iomem *) offset;
+}
+
+static inline void iounmap(void __iomem *addr)
+{
+}
 #endif /* CONFIG_PCI */
 
 #include <asm-generic/io.h>
-- 
2.25.1