Date: Wed, 19 Jul 2017 16:06:36 +0300
From: yury norov <ynorov@caviumnetworks.com>
To: andy shevchenko <andriy.shevchenko@linux.intel.com>
Cc: "rafael j . wysocki" <rjw@rjwysocki.net>, linux-pm@vger.kernel.org,
        thomas gleixner <tglx@linutronix.de>, ingo molnar <mingo@redhat.com>,
        "h . peter anvin" <hpa@zytor.com>, x86@kernel.org,
        linux-kernel@vger.kernel.org, hanjun guo <guohanjun@huawei.com>,
        linux-acpi@vger.kernel.org, geert uytterhoeven <geert@linux-m68k.org>
Subject: re: [patch v3 2/5] acpi / boot: correct address space of
 __acpi_map_table()
Message-ID: <20170719130636.apmaj5ya4obkhvga@yury-thinkpad>
References: <20170718150420.61600-1-andriy.shevchenko@linux.intel.com>
 <20170718150420.61600-3-andriy.shevchenko@linux.intel.com>
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Hi Andy,

> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
> index 09ddb3cd627a..6d5b1346268a 100644
> --- a/arch/x86/kernel/acpi/boot.c
> +++ b/arch/x86/kernel/acpi/boot.c
> @@ -118,7 +118,7 @@ static u32 isa_irq_to_gsi[nr_irqs_legacy] __read_mostly = {
>   * this is just a simple wrapper around early_ioremap(),
>   * with sanity checks for phys == 0 and size == 0.
>   */
> -char *__init __acpi_map_table(unsigned long phys, unsigned long size)
> +void __init __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
>  {
>  
>  	if (!phys || !size)
> @@ -127,7 +127,7 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
>  	return early_ioremap(phys, size);
>  }

I just found this patch in next tree, and it seems it breaks build for
arm64, and probably for ia64:

arch/arm64/kernel/acpi.c:98:14: error: conflicting types for ‘__acpi_map_table’
 char *__init __acpi_map_table(unsigned long phys, unsigned long size)
              ^~~~~~~~~~~~~~~~
in file included from arch/arm64/kernel/acpi.c:18:0:
./include/linux/acpi.h:231:15: note: previous declaration of ‘__acpi_map_table’ was here
 void __iomem *__acpi_map_table(unsigned long phys_addr, unsigned long size);
               ^~~~~~~~~~~~~~~~
arch/arm64/kernel/acpi.c:106:13: error: conflicting types for ‘__acpi_unmap_table’
 void __init __acpi_unmap_table(char *map, unsigned long size)
             ^~~~~~~~~~~~~~~~~~
in file included from arch/arm64/kernel/acpi.c:18:0:
./include/linux/acpi.h:232:6: note: previous declaration of ‘__acpi_unmap_table’ was here
 void __acpi_unmap_table(void __iomem *map, unsigned long size);
      ^~~~~~~~~~~~~~~~~~

the patch below fixes it. (Tested on arm64 only.)

Yury

>From 711e07171de68e71508695078bf6b897773a79ec Mon Sep 17 00:00:00 2001
From: Yury Norov <ynorov@caviumnetworks.com>
Date: Wed, 19 Jul 2017 16:00:02 +0300
Subject: [PATCH] ACPI / boot: fix prototypes for __acpi_{un}map_table for
 arm64 and ia64

The prototypes were changed in patch "ACPI / boot: Correct address space
of  __acpi_map_table()"

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
 arch/arm64/kernel/acpi.c | 4 ++--
 arch/ia64/kernel/acpi.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index e25c11e727fe..177a871c059d 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -95,7 +95,7 @@ static int __init dt_scan_depth1_nodes(unsigned long node,
  * __acpi_map_table() will be called before page_init(), so early_ioremap()
  * or early_memremap() should be called here to for ACPI table mapping.
  */
-char *__init __acpi_map_table(unsigned long phys, unsigned long size)
+void __iomem *__acpi_map_table(unsigned long phys, unsigned long size)
 {
 	if (!size)
 		return NULL;
@@ -103,7 +103,7 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
 	return early_memremap(phys, size);
 }
 
-void __init __acpi_unmap_table(char *map, unsigned long size)
+void __acpi_unmap_table(void __iomem *map, unsigned long size)
 {
 	if (!map || !size)
 		return;
diff --git a/arch/ia64/kernel/acpi.c b/arch/ia64/kernel/acpi.c
index 7508c306aa9e..462a275c0479 100644
--- a/arch/ia64/kernel/acpi.c
+++ b/arch/ia64/kernel/acpi.c
@@ -159,12 +159,12 @@ int acpi_request_vector(u32 int_type)
 	return vector;
 }
 
-char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
+void __iomem *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
 {
 	return __va(phys_addr);
 }
 
-void __init __acpi_unmap_table(char *map, unsigned long size)
+void __init __acpi_unmap_table(void __iomem *map, unsigned long size)
 {
 }
 
-- 
2.11.0