linux-kernel - [PATCH v8 19/19] mm: ioremap: remove unneeded ioremap_allowed and iounmap

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Message-Id: <20230706154520.11257-20-bhe@redhat.com>
Date:   Thu,  6 Jul 2023 23:45:20 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org, arnd@...db.de,
        hch@....de, christophe.leroy@...roup.eu, rppt@...nel.org,
        willy@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        shorne@...il.com, David.Laight@...LAB.COM, deller@....de,
        nathan@...nel.org, glaubitz@...sik.fu-berlin.de,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v8 19/19] mm: ioremap: remove unneeded ioremap_allowed and iounmap_allowed

Now there are no users of ioremap_allowed and iounmap_allowed, clean
them up.

Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 include/asm-generic/io.h | 26 --------------------------
 mm/ioremap.c             |  6 ------
 2 files changed, 32 deletions(-)

diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 39244c3ee797..bac63e874c7b 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1047,32 +1047,6 @@ static inline void iounmap(volatile void __iomem *addr)
 #elif defined(CONFIG_GENERIC_IOREMAP)
 #include <linux/pgtable.h>
 
-/*
- * Arch code can implement the following two hooks when using GENERIC_IOREMAP
- * ioremap_allowed() return a bool,
- *   - true means continue to remap
- *   - false means skip remap and return directly
- * iounmap_allowed() return a bool,
- *   - true means continue to vunmap
- *   - false means skip vunmap and return directly
- */
-#ifndef ioremap_allowed
-#define ioremap_allowed ioremap_allowed
-static inline bool ioremap_allowed(phys_addr_t phys_addr, size_t size,
-				   unsigned long prot)
-{
-	return true;
-}
-#endif
-
-#ifndef iounmap_allowed
-#define iounmap_allowed iounmap_allowed
-static inline bool iounmap_allowed(void *addr)
-{
-	return true;
-}
-#endif
-
 void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 				   pgprot_t prot);
 
diff --git a/mm/ioremap.c b/mm/ioremap.c
index a21a6c9fa5ab..3e049dfb28bd 100644
--- a/mm/ioremap.c
+++ b/mm/ioremap.c
@@ -33,9 +33,6 @@ void __iomem *generic_ioremap_prot(phys_addr_t phys_addr, size_t size,
 	phys_addr -= offset;
 	size = PAGE_ALIGN(size + offset);
 
-	if (!ioremap_allowed(phys_addr, size, pgprot_val(prot)))
-		return NULL;
-
 	area = __get_vm_area_caller(size, VM_IOREMAP, IOREMAP_START,
 				    IOREMAP_END, __builtin_return_address(0));
 	if (!area)
@@ -64,9 +61,6 @@ void generic_iounmap(volatile void __iomem *addr)
 {
 	void *vaddr = (void *)((unsigned long)addr & PAGE_MASK);
 
-	if (!iounmap_allowed(vaddr))
-		return;
-
 	if (is_ioremap_addr(vaddr))
 		vunmap(vaddr);
 }
-- 
2.34.1