diff mbox series

[v1,6/6] x86: remove memory hotplug support on X86_32

Message ID 20210929143600.49379-7-david@redhat.com (mailing list archive)
State New
Headers show
Series mm/memory_hotplug: Kconfig and 32 bit cleanups | expand

Commit Message

David Hildenbrand Sept. 29, 2021, 2:36 p.m. UTC 
CONFIG_MEMORY_HOTPLUG was marked BROKEN over one year and we just
restricted it to 64 bit. Let's remove the unused x86 32bit implementation
and simplify the Kconfig.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 arch/x86/Kconfig      |  6 +++---
 arch/x86/mm/init_32.c | 31 -------------------------------
 2 files changed, 3 insertions(+), 34 deletions(-)

Comments

Oscar Salvador Oct. 7, 2021, 9:15 a.m. UTC | #1 
On Wed, Sep 29, 2021 at 04:36:00PM +0200, David Hildenbrand wrote:
> CONFIG_MEMORY_HOTPLUG was marked BROKEN over one year and we just
> restricted it to 64 bit. Let's remove the unused x86 32bit implementation
> and simplify the Kconfig.
> 
> Signed-off-by: David Hildenbrand <david@redhat.com>

Reviewed-by: Oscar Salvador <osalvador@suse.de>

> ---
>  arch/x86/Kconfig      |  6 +++---
>  arch/x86/mm/init_32.c | 31 -------------------------------
>  2 files changed, 3 insertions(+), 34 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index ab83c22d274e..85f4762429f1 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -62,7 +62,7 @@ config X86
>  	select ARCH_32BIT_OFF_T			if X86_32
>  	select ARCH_CLOCKSOURCE_INIT
>  	select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
> -	select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM)
> +	select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64
>  	select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
>  	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
>  	select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
> @@ -1615,7 +1615,7 @@ config ARCH_SELECT_MEMORY_MODEL
>  
>  config ARCH_MEMORY_PROBE
>  	bool "Enable sysfs memory/probe interface"
> -	depends on X86_64 && MEMORY_HOTPLUG
> +	depends on MEMORY_HOTPLUG
>  	help
>  	  This option enables a sysfs memory/probe interface for testing.
>  	  See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
> @@ -2395,7 +2395,7 @@ endmenu
>  
>  config ARCH_HAS_ADD_PAGES
>  	def_bool y
> -	depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
> +	depends on ARCH_ENABLE_MEMORY_HOTPLUG
>  
>  config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
>  	def_bool y
> diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> index bd90b8fe81e4..5cd7ea6d645c 100644
> --- a/arch/x86/mm/init_32.c
> +++ b/arch/x86/mm/init_32.c
> @@ -779,37 +779,6 @@ void __init mem_init(void)
>  	test_wp_bit();
>  }
>  
> -#ifdef CONFIG_MEMORY_HOTPLUG
> -int arch_add_memory(int nid, u64 start, u64 size,
> -		    struct mhp_params *params)
> -{
> -	unsigned long start_pfn = start >> PAGE_SHIFT;
> -	unsigned long nr_pages = size >> PAGE_SHIFT;
> -	int ret;
> -
> -	/*
> -	 * The page tables were already mapped at boot so if the caller
> -	 * requests a different mapping type then we must change all the
> -	 * pages with __set_memory_prot().
> -	 */
> -	if (params->pgprot.pgprot != PAGE_KERNEL.pgprot) {
> -		ret = __set_memory_prot(start, nr_pages, params->pgprot);
> -		if (ret)
> -			return ret;
> -	}
> -
> -	return __add_pages(nid, start_pfn, nr_pages, params);
> -}
> -
> -void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
> -{
> -	unsigned long start_pfn = start >> PAGE_SHIFT;
> -	unsigned long nr_pages = size >> PAGE_SHIFT;
> -
> -	__remove_pages(start_pfn, nr_pages, altmap);
> -}
> -#endif
> -
>  int kernel_set_to_readonly __read_mostly;
>  
>  static void mark_nxdata_nx(void)
> -- 
> 2.31.1
> 
>
David Hildenbrand Oct. 7, 2021, 9:27 a.m. UTC | #2 
On 07.10.21 11:15, Oscar Salvador wrote:
> On Wed, Sep 29, 2021 at 04:36:00PM +0200, David Hildenbrand wrote:
>> CONFIG_MEMORY_HOTPLUG was marked BROKEN over one year and we just
>> restricted it to 64 bit. Let's remove the unused x86 32bit implementation
>> and simplify the Kconfig.
>>
>> Signed-off-by: David Hildenbrand <david@redhat.com>
> 
> Reviewed-by: Oscar Salvador <osalvador@suse.de>

Thanks for the review Oscar!
diff mbox series

Patch

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ab83c22d274e..85f4762429f1 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -62,7 +62,7 @@  config X86
 	select ARCH_32BIT_OFF_T			if X86_32
 	select ARCH_CLOCKSOURCE_INIT
 	select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION
-	select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM)
+	select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64
 	select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG
 	select ARCH_ENABLE_SPLIT_PMD_PTLOCK if (PGTABLE_LEVELS > 2) && (X86_64 || X86_PAE)
 	select ARCH_ENABLE_THP_MIGRATION if X86_64 && TRANSPARENT_HUGEPAGE
@@ -1615,7 +1615,7 @@  config ARCH_SELECT_MEMORY_MODEL
 
 config ARCH_MEMORY_PROBE
 	bool "Enable sysfs memory/probe interface"
-	depends on X86_64 && MEMORY_HOTPLUG
+	depends on MEMORY_HOTPLUG
 	help
 	  This option enables a sysfs memory/probe interface for testing.
 	  See Documentation/admin-guide/mm/memory-hotplug.rst for more information.
@@ -2395,7 +2395,7 @@  endmenu
 
 config ARCH_HAS_ADD_PAGES
 	def_bool y
-	depends on X86_64 && ARCH_ENABLE_MEMORY_HOTPLUG
+	depends on ARCH_ENABLE_MEMORY_HOTPLUG
 
 config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
 	def_bool y
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index bd90b8fe81e4..5cd7ea6d645c 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -779,37 +779,6 @@  void __init mem_init(void)
 	test_wp_bit();
 }
 
-#ifdef CONFIG_MEMORY_HOTPLUG
-int arch_add_memory(int nid, u64 start, u64 size,
-		    struct mhp_params *params)
-{
-	unsigned long start_pfn = start >> PAGE_SHIFT;
-	unsigned long nr_pages = size >> PAGE_SHIFT;
-	int ret;
-
-	/*
-	 * The page tables were already mapped at boot so if the caller
-	 * requests a different mapping type then we must change all the
-	 * pages with __set_memory_prot().
-	 */
-	if (params->pgprot.pgprot != PAGE_KERNEL.pgprot) {
-		ret = __set_memory_prot(start, nr_pages, params->pgprot);
-		if (ret)
-			return ret;
-	}
-
-	return __add_pages(nid, start_pfn, nr_pages, params);
-}
-
-void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
-{
-	unsigned long start_pfn = start >> PAGE_SHIFT;
-	unsigned long nr_pages = size >> PAGE_SHIFT;
-
-	__remove_pages(start_pfn, nr_pages, altmap);
-}
-#endif
-
 int kernel_set_to_readonly __read_mostly;
 
 static void mark_nxdata_nx(void)