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Date:   Fri, 2 Sep 2022 17:48:37 +0800
From:   Baoquan He <bhe@redhat.com>
To:     kernel test robot <lkp@intel.com>
Cc:     linux-kernel@vger.kernel.org, kbuild-all@lists.01.org,
        linux-mm@kvack.org, akpm@linux-foundation.org, hch@infradead.org,
        agordeev@linux.ibm.com, wangkefeng.wang@huawei.com,
        linux-arm-kernel@lists.infradead.org,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>, linux-sh@vger.kernel.org
Subject: Re: [PATCH v2 10/11] sh: mm: Convert to GENERIC_IOREMAP
Message-ID: <YxHRdQft06rIBM+j@MiWiFi-R3L-srv>
References: <20220820003125.353570-11-bhe@redhat.com>
 <202208201146.8VeY9pez-lkp@intel.com>
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On 08/20/22 at 11:41am, kernel test robot wrote:
> Hi Baoquan,
> 
> I love your patch! Yet something to improve:
> 
> [auto build test ERROR on akpm-mm/mm-everything]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/mm-ioremap-Convert-architectures-to-take-GENERIC_IOREMAP-way/20220820-083435
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> config: sh-allmodconfig
> compiler: sh4-linux-gcc (GCC) 12.1.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/503a31451202f89e58bc5f0a49261398fafbd90e
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review Baoquan-He/mm-ioremap-Convert-architectures-to-take-GENERIC_IOREMAP-way/20220820-083435
>         git checkout 503a31451202f89e58bc5f0a49261398fafbd90e
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=sh prepare

I finally find gcc-sh-linux-gnu and its dependency on rpmfind.net, and
succeeded to reproduce the building failure.
isl-0.16.1-13
cross-gcc-common
gcc-sh-linux-gnu

Based on previous fixing patch for parisc, below draft patch can fix all
reported building issues on sh.

diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 3c5ff82a511a..eb550c72922d 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -225,6 +225,9 @@ __BUILD_IOPORT_STRING(q, u64)
 #define IO_SPACE_LIMIT 0xffffffff
 
 /* We really want to try and get these to memcpy etc */
+#define memset_io memset_io
+#define memcpy_fromio memcpy_fromio
+#define memcpy_toio memcpy_toio
 void memcpy_fromio(void *, const volatile void __iomem *, unsigned long);
 void memcpy_toio(volatile void __iomem *, const void *, unsigned long);
 void memset_io(volatile void __iomem *, int, unsigned long);
@@ -256,18 +259,17 @@ int arch_iounmap(void __iomem *addr);
 
 #define ioremap_cache(addr, size)  \
 	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
-#define ioremap_cache ioremap_cache
 
 #define ioremap_uc	ioremap
 
-#include <asm-generic/io.h>
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
  */
 #define xlate_dev_mem_ptr(p)	__va(p)
 
+#include <asm-generic/io.h>
+
 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
 int valid_phys_addr_range(phys_addr_t addr, size_t size);
 int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
diff --git a/arch/sh/include/asm/io_noioport.h b/arch/sh/include/asm/io_noioport.h
index f7938fe0f911..5ba4116b4265 100644
--- a/arch/sh/include/asm/io_noioport.h
+++ b/arch/sh/include/asm/io_noioport.h
@@ -53,6 +53,13 @@ static inline void ioport_unmap(void __iomem *addr)
 #define outw_p(x, addr)	outw((x), (addr))
 #define outl_p(x, addr)	outl((x), (addr))
 
+#define insb insb
+#define insw insw
+#define insl insl
+#define outsb outsb
+#define outsw outsw
+#define outsl outsl
+
 static inline void insb(unsigned long port, void *dst, unsigned long count)
 {
 	BUG();
diff --git a/arch/sh/mm/ioremap.c b/arch/sh/mm/ioremap.c
index 720a9186b06b..725a1623675a 100644
--- a/arch/sh/mm/ioremap.c
+++ b/arch/sh/mm/ioremap.c
@@ -72,7 +72,7 @@ __ioremap_29bit(phys_addr_t offset, unsigned long size, pgprot_t prot)
 #define __ioremap_29bit(offset, size, prot)		NULL
 #endif /* CONFIG_29BIT */
 
-void __iomem *
+void __iomem * __ref
 arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
 {
 	unsigned long last_addr, phys_addr = *paddr;
@@ -102,7 +102,8 @@ arch_ioremap(phys_addr_t *paddr, size_t size, unsigned long *prot_val)
 	 * First try to remap through the PMB.
 	 * PMB entries are all pre-faulted.
 	 */
-	mapped = pmb_remap_caller(phys_addr, size, pgprot, caller);
+	mapped = pmb_remap_caller(phys_addr, size, pgprot,
+			__builtin_return_address(0));
 	if (mapped && !IS_ERR(mapped))
 		return mapped;
 
@@ -129,7 +130,6 @@ static inline int iomapping_nontranslatable(unsigned long offset)
 int arch_iounmap(void __iomem *addr)
 {
 	unsigned long vaddr = (unsigned long __force)addr;
-	struct vm_struct *p;
 
 	/*
 	 * Nothing to do if there is no translatable mapping.