linux-kernel - [PATCH v5 15/17] mm: pgtable: completely move pagetable_dtor() to generic tlb_remove

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <0c733ac867b287ec08190676496d1decebf49da2.1736317725.git.zhengqi.arch@bytedance.com>
Date: Wed,  8 Jan 2025 14:57:31 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: peterz@...radead.org,
	agordeev@...ux.ibm.com,
	kevin.brodsky@....com,
	alex@...ti.fr,
	andreas@...sler.com,
	palmer@...belt.com,
	tglx@...utronix.de,
	david@...hat.com,
	jannh@...gle.com,
	hughd@...gle.com,
	yuzhao@...gle.com,
	willy@...radead.org,
	muchun.song@...ux.dev,
	vbabka@...nel.org,
	lorenzo.stoakes@...cle.com,
	akpm@...ux-foundation.org,
	rientjes@...gle.com,
	vishal.moola@...il.com,
	arnd@...db.de,
	will@...nel.org,
	aneesh.kumar@...nel.org,
	npiggin@...il.com,
	dave.hansen@...ux.intel.com,
	rppt@...nel.org,
	ryan.roberts@....com
Cc: linux-mm@...ck.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	linux-arch@...r.kernel.org,
	linux-csky@...r.kernel.org,
	linux-hexagon@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linux-m68k@...ts.linux-m68k.org,
	linux-mips@...r.kernel.org,
	linux-openrisc@...r.kernel.org,
	linux-sh@...r.kernel.org,
	linux-um@...ts.infradead.org,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH v5 15/17] mm: pgtable: completely move pagetable_dtor() to generic tlb_remove_table()

For the generic tlb_remove_table(), it is implemented in the following two
forms:

1) CONFIG_MMU_GATHER_TABLE_FREE is enabled

tlb_remove_table
--> generic __tlb_remove_table()

2) CONFIG_MMU_GATHER_TABLE_FREE is disabled

tlb_remove_table
--> tlb_remove_page

For case 1), the pagetable_dtor() has already been moved to generic
__tlb_remove_table().

For case 2), now only arm will call tlb_remove_table()/tlb_remove_ptdesc()
when CONFIG_MMU_GATHER_TABLE_FREE is disabled. Let's move pagetable_dtor()
completely to generic tlb_remove_table(), so that the architectures can
follow more easily.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
Suggested-by: Kevin Brodsky <kevin.brodsky@....com>
Reviewed-by: Kevin Brodsky <kevin.brodsky@....com>
---
 arch/arm/include/asm/tlb.h |  4 ----
 include/asm-generic/tlb.h  | 10 ++++++++--
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
index b8eebdb598631..ea4fbe7b17f6f 100644
--- a/arch/arm/include/asm/tlb.h
+++ b/arch/arm/include/asm/tlb.h
@@ -34,10 +34,6 @@ __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
 {
 	struct ptdesc *ptdesc = page_ptdesc(pte);
 
-#ifndef CONFIG_MMU_GATHER_TABLE_FREE
-	pagetable_dtor(ptdesc);
-#endif
-
 #ifndef CONFIG_ARM_LPAE
 	/*
 	 * With the classic ARM MMU, a pte page has two corresponding pmd
diff --git a/include/asm-generic/tlb.h b/include/asm-generic/tlb.h
index 69de47c7ef3c5..53ae7748f555b 100644
--- a/include/asm-generic/tlb.h
+++ b/include/asm-generic/tlb.h
@@ -220,14 +220,20 @@ static inline void __tlb_remove_table(void *table)
 
 extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
 
-#else /* !CONFIG_MMU_GATHER_HAVE_TABLE_FREE */
+#else /* !CONFIG_MMU_GATHER_TABLE_FREE */
 
+static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page);
 /*
  * Without MMU_GATHER_TABLE_FREE the architecture is assumed to have page based
  * page directories and we can use the normal page batching to free them.
  */
-#define tlb_remove_table(tlb, page) tlb_remove_page((tlb), (page))
+static inline void tlb_remove_table(struct mmu_gather *tlb, void *table)
+{
+	struct page *page = (struct page *)table;
 
+	pagetable_dtor(page_ptdesc(page));
+	tlb_remove_page(tlb, page);
+}
 #endif /* CONFIG_MMU_GATHER_TABLE_FREE */
 
 #ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE
-- 
2.20.1