From 4b3073e1c53a256275f1079c0fbfbe85883d9275 Mon Sep 17 00:00:00 2001 From: Russell King Date: Fri, 18 Dec 2009 16:40:18 +0000 Subject: MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself On VIVT ARM, when we have multiple shared mappings of the same file in the same MM, we need to ensure that we have coherency across all copies. We do this via make_coherent() by making the pages uncacheable. This used to work fine, until we allowed highmem with highpte - we now have a page table which is mapped as required, and is not available for modification via update_mmu_cache(). Ralf Beache suggested getting rid of the PTE value passed to update_mmu_cache(): On MIPS update_mmu_cache() calls __update_tlb() which walks pagetables to construct a pointer to the pte again. Passing a pte_t * is much more elegant. Maybe we might even replace the pte argument with the pte_t? Ben Herrenschmidt would also like the pte pointer for PowerPC: Passing the ptep in there is exactly what I want. I want that -instead- of the PTE value, because I have issue on some ppc cases, for I$/D$ coherency, where set_pte_at() may decide to mask out the _PAGE_EXEC. So, pass in the mapped page table pointer into update_mmu_cache(), and remove the PTE value, updating all implementations and call sites to suit. Includes a fix from Stephen Rothwell: sparc: fix fallout from update_mmu_cache API change Signed-off-by: Stephen Rothwell Acked-by: Benjamin Herrenschmidt Signed-off-by: Russell King --- arch/cris/include/asm/pgtable.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/cris') diff --git a/arch/cris/include/asm/pgtable.h b/arch/cris/include/asm/pgtable.h index 1fcce00..99ea6cd 100644 --- a/arch/cris/include/asm/pgtable.h +++ b/arch/cris/include/asm/pgtable.h @@ -270,7 +270,7 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* defined in head.S */ * Actually I am not sure on what this could be used for. */ static inline void update_mmu_cache(struct vm_area_struct * vma, - unsigned long address, pte_t pte) + unsigned long address, pte_t *ptep) { } -- cgit v1.1 From b26b2d494b659f988b4d75eb394dfa0ddac415c9 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Fri, 1 Jan 2010 17:40:49 +0100 Subject: resource/PCI: align functions now return start of resource As suggested by Linus, align functions should return the start of a resource, not void. An update of "res->start" is no longer necessary. Cc: Bjorn Helgaas Cc: Yinghai Lu Signed-off-by: Dominik Brodowski Signed-off-by: Jesse Barnes --- arch/cris/arch-v32/drivers/pci/bios.c | 14 ++++++-------- 1 file changed, 6 insertions(+), 8 deletions(-) (limited to 'arch/cris') diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c index 77ee319..5811e2f 100644 --- a/arch/cris/arch-v32/drivers/pci/bios.c +++ b/arch/cris/arch-v32/drivers/pci/bios.c @@ -41,18 +41,16 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, return 0; } -void +resource_size_t pcibios_align_resource(void *data, struct resource *res, resource_size_t size, resource_size_t align) { - if (res->flags & IORESOURCE_IO) { - resource_size_t start = res->start; + resource_size_t start = res->start; - if (start & 0x300) { - start = (start + 0x3ff) & ~0x3ff; - res->start = start; - } - } + if ((res->flags & IORESOURCE_IO) && (start & 0x300)) + start = (start + 0x3ff) & ~0x3ff; + + return start } int pcibios_enable_resources(struct pci_dev *dev, int mask) -- cgit v1.1 From 3b7a17fcdae532d29dffab9d564a28be08960988 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Fri, 1 Jan 2010 17:40:50 +0100 Subject: resource/PCI: mark struct resource as const Now that we return the new resource start position, there is no need to update "struct resource" inside the align function. Therefore, mark the struct resource as const. Cc: Bjorn Helgaas Cc: Yinghai Lu Signed-off-by: Dominik Brodowski Signed-off-by: Jesse Barnes --- arch/cris/arch-v32/drivers/pci/bios.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/cris') diff --git a/arch/cris/arch-v32/drivers/pci/bios.c b/arch/cris/arch-v32/drivers/pci/bios.c index 5811e2f..d4b9c36 100644 --- a/arch/cris/arch-v32/drivers/pci/bios.c +++ b/arch/cris/arch-v32/drivers/pci/bios.c @@ -42,7 +42,7 @@ int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma, } resource_size_t -pcibios_align_resource(void *data, struct resource *res, +pcibios_align_resource(void *data, const struct resource *res, resource_size_t size, resource_size_t align) { resource_size_t start = res->start; -- cgit v1.1