Re: [PATCH 6/9] arch, mm: remove stale mentions of DISCONIGMEM

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On 02.06.21 12:53, Mike Rapoport wrote:
From: Mike Rapoport <rppt@xxxxxxxxxxxxx>

There are several places that mention DISCONIGMEM in comments or have stale
code guarded by CONFIG_DISCONTIGMEM.

Remove the dead code and update the comments.

Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
---
  arch/ia64/kernel/topology.c     | 5 ++---
  arch/ia64/mm/numa.c             | 5 ++---
  arch/mips/include/asm/mmzone.h  | 6 ------
  arch/mips/mm/init.c             | 3 ---
  arch/nds32/include/asm/memory.h | 6 ------
  arch/xtensa/include/asm/page.h  | 4 ----
  include/linux/gfp.h             | 4 ++--
  7 files changed, 6 insertions(+), 27 deletions(-)

diff --git a/arch/ia64/kernel/topology.c b/arch/ia64/kernel/topology.c
index 09fc385c2acd..3639e0a7cb3b 100644
--- a/arch/ia64/kernel/topology.c
+++ b/arch/ia64/kernel/topology.c
@@ -3,9 +3,8 @@
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
- * This file contains NUMA specific variables and functions which can
- * be split away from DISCONTIGMEM and are used on NUMA machines with
- * contiguous memory.
+ * This file contains NUMA specific variables and functions which are used on
+ * NUMA machines with contiguous memory.
   * 		2002/08/07 Erich Focht <efocht@xxxxxxxxxx>
   * Populate cpu entries in sysfs for non-numa systems as well
   *  	Intel Corporation - Ashok Raj
diff --git a/arch/ia64/mm/numa.c b/arch/ia64/mm/numa.c
index 46b6e5f3a40f..d6579ec3ea32 100644
--- a/arch/ia64/mm/numa.c
+++ b/arch/ia64/mm/numa.c
@@ -3,9 +3,8 @@
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
- * This file contains NUMA specific variables and functions which can
- * be split away from DISCONTIGMEM and are used on NUMA machines with
- * contiguous memory.
+ * This file contains NUMA specific variables and functions which are used on
+ * NUMA machines with contiguous memory.
   *
   *                         2002/08/07 Erich Focht <efocht@xxxxxxxxxx>
   */
diff --git a/arch/mips/include/asm/mmzone.h b/arch/mips/include/asm/mmzone.h
index b826b8473e95..7649ab45e80c 100644
--- a/arch/mips/include/asm/mmzone.h
+++ b/arch/mips/include/asm/mmzone.h
@@ -20,10 +20,4 @@
  #define nid_to_addrbase(nid) 0
  #endif
-#ifdef CONFIG_DISCONTIGMEM
-
-#define pfn_to_nid(pfn)		pa_to_nid((pfn) << PAGE_SHIFT)
-
-#endif /* CONFIG_DISCONTIGMEM */
-
  #endif /* _ASM_MMZONE_H_ */
diff --git a/arch/mips/mm/init.c b/arch/mips/mm/init.c
index c36358758969..97f6ca341448 100644
--- a/arch/mips/mm/init.c
+++ b/arch/mips/mm/init.c
@@ -454,9 +454,6 @@ void __init mem_init(void)
  	BUILD_BUG_ON(IS_ENABLED(CONFIG_32BIT) && (_PFN_SHIFT > PAGE_SHIFT));
#ifdef CONFIG_HIGHMEM
-#ifdef CONFIG_DISCONTIGMEM
-#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
-#endif
  	max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
  #else
  	max_mapnr = max_low_pfn;
diff --git a/arch/nds32/include/asm/memory.h b/arch/nds32/include/asm/memory.h
index 940d32842793..62faafbc28e4 100644
--- a/arch/nds32/include/asm/memory.h
+++ b/arch/nds32/include/asm/memory.h
@@ -76,18 +76,12 @@
   *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
   *  virt_addr_valid(k)	indicates whether a virtual address is valid
   */
-#ifndef CONFIG_DISCONTIGMEM
-
  #define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
  #define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
#define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
  #define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
-#else /* CONFIG_DISCONTIGMEM */
-#error CONFIG_DISCONTIGMEM is not supported yet.
-#endif /* !CONFIG_DISCONTIGMEM */
-
  #define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
#endif
diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h
index 37ce25ef92d6..493eb7083b1a 100644
--- a/arch/xtensa/include/asm/page.h
+++ b/arch/xtensa/include/asm/page.h
@@ -192,10 +192,6 @@ static inline unsigned long ___pa(unsigned long va)
  #define pfn_valid(pfn) \
  	((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
-#ifdef CONFIG_DISCONTIGMEM
-# error CONFIG_DISCONTIGMEM not supported
-#endif
-
  #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  #define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)
  #define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 11da8af06704..dbe1f5fc901d 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -494,8 +494,8 @@ static inline int gfp_zonelist(gfp_t flags)
   * There are two zonelists per node, one for all zones with memory and
   * one containing just zones from the node the zonelist belongs to.
   *
- * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
- * optimized to &contig_page_data at compile-time.
+ * For the case of non-NUMA systems the NODE_DATA() gets optimized to
+ * &contig_page_data at compile-time.
   */
  static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
  {


Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>

--
Thanks,

David / dhildenb




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