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From: ira.weiny@intel.com
To: linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Christian Koenig <christian.koenig@amd.com>,
	Huang Rui <ray.huang@amd.com>
Cc: Ira Weiny <ira.weiny@intel.com>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	"James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
	Helge Deller <deller@gmx.de>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Chris Zankel <chris@zankel.net>,
	Max Filippov <jcmvbkbc@gmail.com>,
	Dan Williams <dan.j.williams@intel.com>,
	linux-snps-arc@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org,
	linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org,
	linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org,
	linux-xtensa@linux-xtensa.org, dri-devel@lists.freedesktop.org
Subject: [PATCH V2 08/11] arch/kmap: Ensure kmap_prot visibility
Date: Sun,  3 May 2020 18:09:09 -0700
Message-ID: <20200504010912.982044-9-ira.weiny@intel.com> (raw)
In-Reply-To: <20200504010912.982044-1-ira.weiny@intel.com>

From: Ira Weiny <ira.weiny@intel.com>

We want to support kmap_atomic_prot() on all architectures and it makes
sense to define kmap_atomic() to use the default kmap_prot.

So we ensure all arch's have a globally available kmap_prot either as a
define or exported symbol.

Signed-off-by: Ira Weiny <ira.weiny@intel.com>
---
 arch/microblaze/include/asm/highmem.h | 2 +-
 arch/microblaze/mm/init.c             | 3 ---
 arch/powerpc/include/asm/highmem.h    | 2 +-
 arch/powerpc/mm/mem.c                 | 3 ---
 arch/sparc/mm/highmem.c               | 1 +
 5 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/microblaze/include/asm/highmem.h b/arch/microblaze/include/asm/highmem.h
index 1b8a3c5102bd..033ac5b5c2da 100644
--- a/arch/microblaze/include/asm/highmem.h
+++ b/arch/microblaze/include/asm/highmem.h
@@ -25,8 +25,8 @@
 #include <linux/uaccess.h>
 #include <asm/fixmap.h>
 
+#define kmap_prot		PAGE_KERNEL
 extern pte_t *kmap_pte;
-extern pgprot_t kmap_prot;
 extern pte_t *pkmap_page_table;
 
 /*
diff --git a/arch/microblaze/mm/init.c b/arch/microblaze/mm/init.c
index 1ffbfa96b9b8..a467686c13af 100644
--- a/arch/microblaze/mm/init.c
+++ b/arch/microblaze/mm/init.c
@@ -49,8 +49,6 @@ unsigned long lowmem_size;
 #ifdef CONFIG_HIGHMEM
 pte_t *kmap_pte;
 EXPORT_SYMBOL(kmap_pte);
-pgprot_t kmap_prot;
-EXPORT_SYMBOL(kmap_prot);
 
 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 {
@@ -68,7 +66,6 @@ static void __init highmem_init(void)
 	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
 
 	kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
-	kmap_prot = PAGE_KERNEL;
 }
 
 static void highmem_setup(void)
diff --git a/arch/powerpc/include/asm/highmem.h b/arch/powerpc/include/asm/highmem.h
index 373a470df205..ee5de974c5ef 100644
--- a/arch/powerpc/include/asm/highmem.h
+++ b/arch/powerpc/include/asm/highmem.h
@@ -29,8 +29,8 @@
 #include <asm/page.h>
 #include <asm/fixmap.h>
 
+#define kmap_prot		PAGE_KERNEL
 extern pte_t *kmap_pte;
-extern pgprot_t kmap_prot;
 extern pte_t *pkmap_page_table;
 
 /*
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 041ed7cfd341..3f642b058731 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -64,8 +64,6 @@ bool init_mem_is_free;
 #ifdef CONFIG_HIGHMEM
 pte_t *kmap_pte;
 EXPORT_SYMBOL(kmap_pte);
-pgprot_t kmap_prot;
-EXPORT_SYMBOL(kmap_prot);
 #endif
 
 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
@@ -245,7 +243,6 @@ void __init paging_init(void)
 	pkmap_page_table = virt_to_kpte(PKMAP_BASE);
 
 	kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
-	kmap_prot = PAGE_KERNEL;
 #endif /* CONFIG_HIGHMEM */
 
 	printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c
index 469786bc430f..9f06d75e88e1 100644
--- a/arch/sparc/mm/highmem.c
+++ b/arch/sparc/mm/highmem.c
@@ -33,6 +33,7 @@
 #include <asm/vaddrs.h>
 
 pgprot_t kmap_prot;
+EXPORT_SYMBOL(kmap_prot);
 
 static pte_t *kmap_pte;
 
-- 
2.25.1


  parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-04  1:09 [PATCH V2 00/11] Subject: Remove duplicated kmap code ira.weiny
2020-05-04  1:09 ` [PATCH V2 01/11] arch/kmap: Remove BUG_ON() ira.weiny
2020-05-04  1:09 ` [PATCH V2 02/11] arch/xtensa: Move kmap build bug out of the way ira.weiny
2020-05-04  1:09 ` [PATCH V2 03/11] arch/kmap: Remove redundant arch specific kmaps ira.weiny
2020-05-04  1:09 ` [PATCH V2 04/11] arch/kunmap: Remove duplicate kunmap implementations ira.weiny
2020-05-04  1:09 ` [PATCH V2 05/11] {x86,powerpc,microblaze}/kmap: Move preempt disable ira.weiny
2020-05-06  6:11   ` Christoph Hellwig
2020-05-06 20:25     ` Ira Weiny
2020-05-04  1:09 ` [PATCH V2 06/11] arch/kmap_atomic: Consolidate duplicate code ira.weiny
2020-05-06  6:12   ` Christoph Hellwig
2020-05-04  1:09 ` [PATCH V2 07/11] arch/kunmap_atomic: " ira.weiny
2020-05-06  6:12   ` Christoph Hellwig
2020-05-04  1:09 ` ira.weiny [this message]
2020-05-06  6:13   ` [PATCH V2 08/11] arch/kmap: Ensure kmap_prot visibility Christoph Hellwig
2020-05-06 20:33     ` Ira Weiny
2020-05-07  4:56   ` Christoph Hellwig
2020-05-04  1:09 ` [PATCH V2 09/11] arch/kmap: Don't hard code kmap_prot values ira.weiny
2020-05-04  1:09 ` [PATCH V2 10/11] arch/kmap: Define kmap_atomic_prot() for all arch's ira.weiny
2020-05-06  6:14   ` Christoph Hellwig
2020-05-04  1:09 ` [PATCH V2 11/11] drm: Remove drm specific kmap_atomic code ira.weiny
2020-05-04 11:18   ` Daniel Vetter
2020-05-04 20:24     ` Ira Weiny
2020-05-04  1:35 ` [PATCH V2 00/11] Subject: Remove duplicated kmap code Al Viro
2020-05-04  5:04   ` Ira Weiny
2020-05-04  5:33     ` Al Viro
2020-05-04 20:17       ` Ira Weiny
2020-05-04 21:02         ` Al Viro
2020-05-04 23:27           ` Ira Weiny

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