[PATCH v4 7/8] mm: convert __HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config

[Qi Zheng]

From: Qi Zheng <zhengqi.arch at bytedance.com>

For architectures that define __HAVE_ARCH_TLB_REMOVE_TABLE, the page
tables at the pmd/pud level are generally not of struct ptdesc type, and
do not have pt_rcu_head member, thus these architectures cannot support
PT_RECLAIM.

In preparation for enabling PT_RECLAIM on more architectures, convert
__HAVE_ARCH_TLB_REMOVE_TABLE to CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE config,
so that we can make conditional judgments in Kconfig.

Signed-off-by: Qi Zheng <zhengqi.arch at bytedance.com>
---
 arch/powerpc/Kconfig            | 1 +
 arch/powerpc/include/asm/tlb.h  | 1 -
 arch/sparc/Kconfig              | 1 +
 arch/sparc/include/asm/tlb_64.h | 1 -
 include/asm-generic/tlb.h       | 2 +-
 mm/Kconfig                      | 3 +++
 6 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 9537a61ebae02..b47aa8fd62742 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -304,6 +304,7 @@ config PPC
 	select LOCK_MM_AND_FIND_VMA
 	select MMU_GATHER_PAGE_SIZE
 	select MMU_GATHER_RCU_TABLE_FREE
+	select HAVE_ARCH_TLB_REMOVE_TABLE
 	select MMU_GATHER_MERGE_VMAS
 	select MMU_LAZY_TLB_SHOOTDOWN		if PPC_BOOK3S_64
 	select MODULES_USE_ELF_RELA
diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
index 2058e8d3e0138..1ca7d4c4b90db 100644
--- a/arch/powerpc/include/asm/tlb.h
+++ b/arch/powerpc/include/asm/tlb.h
@@ -37,7 +37,6 @@ extern void tlb_flush(struct mmu_gather *tlb);
  */
 #define tlb_needs_table_invalidate()	radix_enabled()
 
-#define __HAVE_ARCH_TLB_REMOVE_TABLE
 /* Get the generic bits... */
 #include <asm-generic/tlb.h>
 
diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
index a630d373e6453..25fa2908d6152 100644
--- a/arch/sparc/Kconfig
+++ b/arch/sparc/Kconfig
@@ -74,6 +74,7 @@ config SPARC64
 	select HAVE_KRETPROBES
 	select HAVE_KPROBES
 	select MMU_GATHER_RCU_TABLE_FREE if SMP
+	select HAVE_ARCH_TLB_REMOVE_TABLE if SMP
 	select MMU_GATHER_MERGE_VMAS
 	select MMU_GATHER_NO_FLUSH_CACHE
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
diff --git a/arch/sparc/include/asm/tlb_64.h b/arch/sparc/include/asm/tlb_64.h
index 1a6e694418e39..3037187482db7 100644
--- a/arch/sparc/include/asm/tlb_64.h
+++ b/arch/sparc/include/asm/tlb_64.h
@@ -33,7 +33,6 @@ void flush_tlb_pending(void);
 #define tlb_needs_table_invalidate()	(false)
 #endif
 
-#define __HAVE_ARCH_TLB_REMOVE_TABLE
 #include <asm-generic/tlb.h>
 
 #endif /* _SPARC64_TLB_H */
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 4d679d2a206b4..3427b8036ba33 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -213,7 +213,7 @@ struct mmu_table_batch {
 #define MAX_TABLE_BATCH		\
 	((PAGE_SIZE - sizeof(struct mmu_table_batch)) / sizeof(void *))
 
-#ifndef __HAVE_ARCH_TLB_REMOVE_TABLE
+#ifndef CONFIG_HAVE_ARCH_TLB_REMOVE_TABLE
 static inline void __tlb_remove_table(void *table)
 {
 	struct ptdesc *ptdesc = (struct ptdesc *)table;
diff --git a/mm/Kconfig b/mm/Kconfig
index a992f2203eb91..456e9eaedca39 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1451,6 +1451,9 @@ config ARCH_HAS_USER_SHADOW_STACK
 	  The architecture has hardware support for userspace shadow call
           stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss).
 
+config HAVE_ARCH_TLB_REMOVE_TABLE
+	def_bool n
+
 config ARCH_SUPPORTS_PT_RECLAIM
 	def_bool n
 
-- 
2.20.1