Linaro-mm-sig

linaro-mm-sig@lists.linaro.org

3 participants
2908 discussions

by Christoph Hellwig

Hi all, Peter noticed that with some dumb luck you can toast the kernel address space with exported vmalloc symbols. I used this as an opportunity to decruft the vmalloc.c API and make it much more systematic. This also removes any chance to create vmalloc mappings outside the designated areas or using executable permissions from modules. Besides that it removes more than 300 lines of code. A git tree is also available here: git://git.infradead.org/users/hch/misc.git sanitize-vmalloc-api Gitweb: http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/sanitize-vm…

5 years, 2 months

[PATCH v2] staging: android: ion: use macro DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops

by R Veera Kumar

It is more clear to use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs file operation rather than DEFINE_SIMPLE_ATTRIBUTE. Found using coccinelle. Signed-off-by: R Veera Kumar <vkor(a)vkten.in> --- Changes in v2: - Give correct explanation for patch - Adjust git commit tag and msg accordingly --- drivers/staging/android/ion/ion.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 38b51eace4f9..dbe4018a6f83 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -554,8 +554,8 @@ static int debug_shrink_get(void *data, u64 *val) return 0; } -DEFINE_SIMPLE_ATTRIBUTE(debug_shrink_fops, debug_shrink_get, - debug_shrink_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(debug_shrink_fops, debug_shrink_get, + debug_shrink_set, "%llu\n"); void ion_device_add_heap(struct ion_heap *heap) { -- 2.20.1

5 years, 2 months

[PATCH -next] dma-buf: fix documentation build warnings

by Randy Dunlap

From: Randy Dunlap <rdunlap(a)infradead.org> Fix documentation warnings in dma-buf.[hc]: ../drivers/dma-buf/dma-buf.c:678: warning: Function parameter or member 'importer_ops' not described in 'dma_buf_dynamic_attach' ../drivers/dma-buf/dma-buf.c:678: warning: Function parameter or member 'importer_priv' not described in 'dma_buf_dynamic_attach' ../include/linux/dma-buf.h:339: warning: Incorrect use of kernel-doc format: * @move_notify Signed-off-by: Randy Dunlap <rdunlap(a)infradead.org> Cc: Sumit Semwal <sumit.semwal(a)linaro.org> Cc: linux-media(a)vger.kernel.org Cc: dri-devel(a)lists.freedesktop.org Cc: linaro-mm-sig(a)lists.linaro.org --- drivers/dma-buf/dma-buf.c | 4 ++-- include/linux/dma-buf.h | 3 +-- 2 files changed, 3 insertions(+), 4 deletions(-) --- linux-next-20200407.orig/drivers/dma-buf/dma-buf.c +++ linux-next-20200407/drivers/dma-buf/dma-buf.c @@ -655,8 +655,8 @@ EXPORT_SYMBOL_GPL(dma_buf_put); * calls attach() of dma_buf_ops to allow device-specific attach functionality * @dmabuf: [in] buffer to attach device to. * @dev: [in] device to be attached. - * @importer_ops [in] importer operations for the attachment - * @importer_priv [in] importer private pointer for the attachment + * @importer_ops: [in] importer operations for the attachment + * @importer_priv: [in] importer private pointer for the attachment * * Returns struct dma_buf_attachment pointer for this attachment. Attachments * must be cleaned up by calling dma_buf_detach(). --- linux-next-20200407.orig/include/linux/dma-buf.h +++ linux-next-20200407/include/linux/dma-buf.h @@ -329,13 +329,12 @@ struct dma_buf { /** * struct dma_buf_attach_ops - importer operations for an attachment - * @move_notify: [optional] notification that the DMA-buf is moving * * Attachment operations implemented by the importer. */ struct dma_buf_attach_ops { /** - * @move_notify + * @move_notify: [optional] notification that the DMA-buf is moving * * If this callback is provided the framework can avoid pinning the * backing store while mappings exists.

5 years, 2 months

Re: [Linaro-mm-sig] [PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc

by Christoph Hellwig

On Wed, Apr 08, 2020 at 08:15:19AM -0700, Matthew Wilcox wrote: > > > > config ZSMALLOC_PGTABLE_MAPPING > > > > bool "Use page table mapping to access object in zsmalloc" > > > > - depends on ZSMALLOC > > > > + depends on ZSMALLOC=y > > > > > > It's a bool so this shouldn't matter... not needed. > > > > My mm/Kconfig has: > > > > config ZSMALLOC > > tristate "Memory allocator for compressed pages" > > depends on MMU > > > > which I think means it can be modular, no? > > Randy means that ZSMALLOC_PGTABLE_MAPPING is a bool, so I think hch's patch > is wrong ... if ZSMALLOC is 'm' then ZSMALLOC_PGTABLE_MAPPING would become > 'n' instead of 'y'. In Linus' tree you can select PGTABLE_MAPPING=y with ZSMALLOC=m, and that fits my understanding of the kbuild language. With this patch I can't anymore.

5 years, 2 months

Re: [Linaro-mm-sig] [PATCH 10/28] mm: only allow page table mappings for built-in zsmalloc

by Randy Dunlap

On 4/8/20 8:15 AM, Matthew Wilcox wrote: > On Wed, Apr 08, 2020 at 05:12:03PM +0200, Peter Zijlstra wrote: >> On Wed, Apr 08, 2020 at 08:01:00AM -0700, Randy Dunlap wrote: >>> Hi, >>> >>> On 4/8/20 4:59 AM, Christoph Hellwig wrote: >>>> diff --git a/mm/Kconfig b/mm/Kconfig >>>> index 36949a9425b8..614cc786b519 100644 >>>> --- a/mm/Kconfig >>>> +++ b/mm/Kconfig >>>> @@ -702,7 +702,7 @@ config ZSMALLOC >>>> >>>> config ZSMALLOC_PGTABLE_MAPPING >>>> bool "Use page table mapping to access object in zsmalloc" >>>> - depends on ZSMALLOC >>>> + depends on ZSMALLOC=y >>> >>> It's a bool so this shouldn't matter... not needed. >> >> My mm/Kconfig has: >> >> config ZSMALLOC >> tristate "Memory allocator for compressed pages" >> depends on MMU >> >> which I think means it can be modular, no? ack. I misread it. > Randy means that ZSMALLOC_PGTABLE_MAPPING is a bool, so I think hch's patch > is wrong ... if ZSMALLOC is 'm' then ZSMALLOC_PGTABLE_MAPPING would become > 'n' instead of 'y'. sigh, I wish that I had meant that. :) thanks. -- ~Randy

5 years, 2 months

Re: [Linaro-mm-sig] [PATCH 18/28] mm: enforce that vmap can't map pages executable

by Christoph Hellwig

On Wed, Apr 08, 2020 at 01:38:36PM +0100, Mark Rutland wrote: > > +static inline pgprot_t pgprot_nx(pgprot_t prot) > > +{ > > + return __pgprot(pgprot_val(prot) | _PAGE_NX); > > +} > > +#define pgprot_nx pgprot_nx > > + > > #ifdef CONFIG_X86_PAE > > I reckon for arm64 we can do similar in our <asm/pgtable.h>: > > #define pgprot_nx(pgprot_t prot) \ > __pgprot_modify(prot, 0, PTE_PXN) > > ... matching the style of our existing pgprot_*() modifier helpers. I've added that for the next version with attribution to you.

5 years, 2 months

Re: [Linaro-mm-sig] [PATCH] dma-buf: support 32bit DMA_BUF_SET_NAME ioctl

by Sumit Semwal

Hello, Daniel, your comments here, please? On Mon, 24 Feb 2020 at 09:09, Martin Liu <liumartin(a)google.com> wrote: > > On Tue, Jan 14, 2020 at 09:41:01PM +0800, Martin Liu wrote: > > CC more MLs for winder review. > > > This commit adds SET_NAME ioctl coversion to > > support 32 bit ioctl. > > > > Signed-off-by: Martin Liu <liumartin(a)google.com> > > --- > > drivers/dma-buf/dma-buf.c | 22 +++++++++++++++++++++- > > 1 file changed, 21 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > > index ce41cd9b758a..a73048b34843 100644 > > --- a/drivers/dma-buf/dma-buf.c > > +++ b/drivers/dma-buf/dma-buf.c > > @@ -25,6 +25,7 @@ > > #include <linux/mm.h> > > #include <linux/mount.h> > > #include <linux/pseudo_fs.h> > > +#include <linux/compat.h> > > > > #include <uapi/linux/dma-buf.h> > > #include <uapi/linux/magic.h> > > @@ -409,13 +410,32 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file) > > dma_resv_unlock(dmabuf->resv); > > } > > > > +#ifdef CONFIG_COMPAT > > +static long dma_buf_ioctl_compat(struct file *file, unsigned int cmd, > > + unsigned long arg) > > +{ > > + switch (_IOC_NR(cmd)) { > > + case _IOC_NR(DMA_BUF_SET_NAME): > > + /* Fix up pointer size*/ > > + if (_IOC_SIZE(cmd) == sizeof(compat_uptr_t)) { > > + cmd &= ~IOCSIZE_MASK; > > + cmd |= sizeof(void *) << IOCSIZE_SHIFT; > > + } > > + break; > > + } > > + return dma_buf_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); > > +} > > +#endif > > + > > static const struct file_operations dma_buf_fops = { > > .release = dma_buf_release, > > .mmap = dma_buf_mmap_internal, > > .llseek = dma_buf_llseek, > > .poll = dma_buf_poll, > > .unlocked_ioctl = dma_buf_ioctl, > > - .compat_ioctl = compat_ptr_ioctl, > > +#ifdef CONFIG_COMPAT > > + .compat_ioctl = dma_buf_ioctl_compat, > > +#endif > > .show_fdinfo = dma_buf_show_fdinfo, > > }; > > > > -- > > 2.25.0.rc1.283.g88dfdc4193-goog > > -- Thanks and regards, Sumit Semwal Linaro Consumer Group - Kernel Team Lead Linaro.org │ Open source software for ARM SoCs

5 years, 2 months

[PATCH v2] staging: android: ion: Align with parenthesis

by John B. Wyatt IV

Align two different lines of arguments with the parenthesis of their respected function definitions. Fix style warnings of matching alignment. Reported by checkpatch. Signed-off-by: John B. Wyatt IV <jbwyatt4(a)gmail.com> --- v2: Change comment title and summary Suggested-by: Julia Lawall <julia.lawall(a)inria.fr> drivers/staging/android/ion/ion_page_pool.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c index f85ec5b16b65..0198b886d906 100644 --- a/drivers/staging/android/ion/ion_page_pool.c +++ b/drivers/staging/android/ion/ion_page_pool.c @@ -37,7 +37,7 @@ static void ion_page_pool_add(struct ion_page_pool *pool, struct page *page) } mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, - 1 << pool->order); + 1 << pool->order); mutex_unlock(&pool->mutex); } @@ -57,7 +57,7 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high) list_del(&page->lru); mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, - -(1 << pool->order)); + -(1 << pool->order)); return page; } -- 2.25.1

5 years, 3 months

[PATCH] staging: android: ion: Fix parenthesis alignment

by John B. Wyatt IV

Fix 2 parenthesis alignment issues. Reported by checkpatch. Signed-off-by: John B. Wyatt IV <jbwyatt4(a)gmail.com> --- drivers/staging/android/ion/ion_page_pool.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c index f85ec5b16b65..0198b886d906 100644 --- a/drivers/staging/android/ion/ion_page_pool.c +++ b/drivers/staging/android/ion/ion_page_pool.c @@ -37,7 +37,7 @@ static void ion_page_pool_add(struct ion_page_pool *pool, struct page *page) } mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, - 1 << pool->order); + 1 << pool->order); mutex_unlock(&pool->mutex); } @@ -57,7 +57,7 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high) list_del(&page->lru); mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE, - -(1 << pool->order)); + -(1 << pool->order)); return page; } -- 2.25.1

5 years, 3 months

[PATCH] staging: android: ion: Fix parenthesis alignment

by John B. Wyatt IV

5 years, 3 months

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Linaro-mm-sig