search for: config_mmu

...age_prot)) >>>> 758 return VM_FAULT_SIGBUS; >>>> 759 >>>> 760 return VM_FAULT_NOPAGE; >>>> 761 } >>>> 762 >>> Yes well, all this remapping clearly has no chance to work >>> on systems without CONFIG_MMU. >> >> It looks to me mmap can work according to Documentation/nommu-mmap.txt. But >> I'm not sure it's worth to bother. >> >> Thanks > > Well > > int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, > unsigned lon...

...age_prot)) >>>> 758 return VM_FAULT_SIGBUS; >>>> 759 >>>> 760 return VM_FAULT_NOPAGE; >>>> 761 } >>>> 762 >>> Yes well, all this remapping clearly has no chance to work >>> on systems without CONFIG_MMU. >> >> It looks to me mmap can work according to Documentation/nommu-mmap.txt. But >> I'm not sure it's worth to bother. >> >> Thanks > > Well > > int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, > unsigned lon...

...VM_FAULT_SIGBUS; > > > > > 759 > > > > > 760 return VM_FAULT_NOPAGE; > > > > > 761 } > > > > > 762 > > > > Yes well, all this remapping clearly has no chance to work > > > > on systems without CONFIG_MMU. > > > > > > It looks to me mmap can work according to Documentation/nommu-mmap.txt. But > > > I'm not sure it's worth to bother. > > > > > > Thanks > > > > Well > > > > int remap_pfn_range(struct vm_area_struct *vma,...

...; PAGE_SHIFT, PAGE_SIZE, >> 757 vma->vm_page_prot)) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Yes well, all this remapping clearly has no chance to work > on systems without CONFIG_MMU. It looks to me mmap can work according to Documentation/nommu-mmap.txt. But I'm not sure it's worth to bother. Thanks > > >

...; PAGE_SHIFT, PAGE_SIZE, >> 757 vma->vm_page_prot)) >> 758 return VM_FAULT_SIGBUS; >> 759 >> 760 return VM_FAULT_NOPAGE; >> 761 } >> 762 > Yes well, all this remapping clearly has no chance to work > on systems without CONFIG_MMU. It looks to me mmap can work according to Documentation/nommu-mmap.txt. But I'm not sure it's worth to bother. Thanks > > >

Hi Jason, I love your patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on linus/master v5.7 next-20200529] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see

Hi Jason, I love your patch! Yet something to improve: [auto build test ERROR on vhost/linux-next] [also build test ERROR on linus/master v5.7 next-20200529] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see

...ux/mm.h >>> @@ -932,6 +932,7 @@ static inline unsigned int page_shift(struct page *page) >>> } >>> >>> void free_compound_page(struct page *page); >>> +void prep_compound_page(struct page *page, unsigned int order); >>> >>> #ifdef CONFIG_MMU >>> /* >>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>> index 78c84bee7e29..25d95f7b1e98 100644 >>> --- a/mm/huge_memory.c >>> +++ b/mm/huge_memory.c >>> @@ -1663,23 +1663,35 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_s...

...ine unsigned int page_shift(struct page *page) >>>>> } >>>>> >>>>> void free_compound_page(struct page *page); >>>>> +void prep_compound_page(struct page *page, unsigned int order); >>>>> >>>>> #ifdef CONFIG_MMU >>>>> /* >>>>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>>>> index 78c84bee7e29..25d95f7b1e98 100644 >>>>> --- a/mm/huge_memory.c >>>>> +++ b/mm/huge_memory.c >>>>> @@ -1663,23 +1663,35 @@ int zap_...

...msung.com> --- arch/m68k/kernel/dma.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/m68k/kernel/dma.c b/arch/m68k/kernel/dma.c index cbc78b4117b5..8cf97cbadc91 100644 --- a/arch/m68k/kernel/dma.c +++ b/arch/m68k/kernel/dma.c @@ -19,7 +19,7 @@ #if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, - gfp_t flag, struct dma_attrs *attrs) + gfp_t flag, unsigned long attrs) { struct page *page, **map; pgprot_t pgprot; @@ -62,7 +62,7 @@ static void *m68k_dma_alloc(struc...

...> 756 notify.addr >> PAGE_SHIFT, PAGE_SIZE, > 757 vma->vm_page_prot)) > 758 return VM_FAULT_SIGBUS; > 759 > 760 return VM_FAULT_NOPAGE; > 761 } > 762 Yes well, all this remapping clearly has no chance to work on systems without CONFIG_MMU. > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all at lists.01.org

...<<(n))-1)) #define DMA_MASK_NONE 0x0ULL diff --git a/lib/Makefile b/lib/Makefile index 13a7c6a..92d6135 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -18,6 +18,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ obj-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o lib-$(CONFIG_MMU) += ioremap.o lib-$(CONFIG_SMP) += cpumask.o +lib-$(CONFIG_HAS_DMA) += dma-noop.o lib-y += kobject.o klist.o obj-y += lockref.o diff --git a/lib/dma-noop.c b/lib/dma-noop.c new file mode 100644 index 0000000..7214564 --- /dev/null +++ b/lib/dma-noop.c @@ -0,0 +1,75 @@ +/* + * lib/dma-noop.c +...

...100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -932,6 +932,7 @@ static inline unsigned int page_shift(struct page *page) > } > > void free_compound_page(struct page *page); > +void prep_compound_page(struct page *page, unsigned int order); > > #ifdef CONFIG_MMU > /* > diff --git a/mm/huge_memory.c b/mm/huge_memory.c > index 78c84bee7e29..25d95f7b1e98 100644 > --- a/mm/huge_memory.c > +++ b/mm/huge_memory.c > @@ -1663,23 +1663,35 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, > } else { > struct page *...

....o \ proportions.o flex_proportions.o ratelimit.o show_mem.o \ is_single_threaded.o plist.o decompress.o kobject_uevent.o \ - earlycpio.o seq_buf.o nmi_backtrace.o + earlycpio.o seq_buf.o nmi_backtrace.o dma-noop.o obj-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o lib-$(CONFIG_MMU) += ioremap.o diff --git a/lib/dma-noop.c b/lib/dma-noop.c new file mode 100644 index 0000000..3ce31302 --- /dev/null +++ b/lib/dma-noop.c @@ -0,0 +1,77 @@ +/* + * lib/dma-noop.c + * + * Stub DMA noop-ops + */ +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/dma-map...

...<<(n))-1)) #define DMA_MASK_NONE 0x0ULL diff --git a/lib/Makefile b/lib/Makefile index 13a7c6a..92d6135 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -18,6 +18,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \ obj-$(CONFIG_ARCH_HAS_DEBUG_STRICT_USER_COPY_CHECKS) += usercopy.o lib-$(CONFIG_MMU) += ioremap.o lib-$(CONFIG_SMP) += cpumask.o +lib-$(CONFIG_HAS_DMA) += dma-noop.o lib-y += kobject.o klist.o obj-y += lockref.o diff --git a/lib/dma-noop.c b/lib/dma-noop.c new file mode 100644 index 0000000..7214564 --- /dev/null +++ b/lib/dma-noop.c @@ -0,0 +1,75 @@ +/* + * lib/dma-noop.c +...

...7 vma->vm_page_prot)) > > > 758 return VM_FAULT_SIGBUS; > > > 759 > > > 760 return VM_FAULT_NOPAGE; > > > 761 } > > > 762 > > Yes well, all this remapping clearly has no chance to work > > on systems without CONFIG_MMU. > > > It looks to me mmap can work according to Documentation/nommu-mmap.txt. But > I'm not sure it's worth to bother. > > Thanks Well int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t...

...h >> +++ b/include/linux/mm.h >> @@ -932,6 +932,7 @@ static inline unsigned int page_shift(struct page *page) >> } >> >> void free_compound_page(struct page *page); >> +void prep_compound_page(struct page *page, unsigned int order); >> >> #ifdef CONFIG_MMU >> /* >> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >> index 78c84bee7e29..25d95f7b1e98 100644 >> --- a/mm/huge_memory.c >> +++ b/mm/huge_memory.c >> @@ -1663,23 +1663,35 @@ int zap_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma, >>...

...2,6 +932,7 @@ static inline unsigned int page_shift(struct page *page) >>>> } >>>> >>>> void free_compound_page(struct page *page); >>>> +void prep_compound_page(struct page *page, unsigned int order); >>>> >>>> #ifdef CONFIG_MMU >>>> /* >>>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c >>>> index 78c84bee7e29..25d95f7b1e98 100644 >>>> --- a/mm/huge_memory.c >>>> +++ b/mm/huge_memory.c >>>> @@ -1663,23 +1663,35 @@ int zap_huge_pmd(struct mmu_gath...

...iff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h index b9bc6c557ea46f..0888656369a45b 100644 --- a/include/linux/dma-noncoherent.h +++ b/include/linux/dma-noncoherent.h @@ -62,16 +62,6 @@ static inline pgprot_t dma_pgprot(struct device *dev, pgprot_t prot, } #endif /* CONFIG_MMU */ -#ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC -void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size, - enum dma_data_direction direction); -#else -static inline void arch_dma_cache_sync(struct device *dev, void *vaddr, - size_t size, enum dma_data_direction direction) -{ -} -#en...

Hi, I'm using initramfs with pivot_root mechanism to mount my real root directory. I notived the gentoo halt.sh script tries to unmount everything on shutdown. That includes /initrd. The kernel seems to freeze immideatly. Do you have the same problems? Regards, Andreas CONFIG_X86=y CONFIG_MMU=y CONFIG_UID16=y CONFIG_GENERIC_ISA_DMA=y CONFIG_GENERIC_IOMAP=y CONFIG_CLEAN_COMPILE=y CONFIG_BROKEN_ON_SMP=y CONFIG_LOCK_KERNEL=y CONFIG_LOCALVERSION="" CONFIG_SWAP=y CONFIG_SYSVIPC=y CONFIG_SYSCTL=y CONFIG_LOG_BUF_SHIFT=18 CONFIG_HOTPLUG=y CONFIG_KOBJECT_UEVENT=y CONFIG_IKCONFIG=y CONF...