drivers//staging/comedi/comedi_fops.c:2380:8: error: 'PAGE_SHARED' undeclared; did you mean 'PAGE_SIZE'?

From: kbuild test robot
Date: Thu Feb 06 2020 - 16:04:37 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 90568ecf561540fa330511e21fcd823b0c3829c6
commit: 6bd33e1ece528f67646db33bf97406b747dafda0 riscv: add nommu support
date: 3 months ago
config: riscv-randconfig-a001-20200207 (attached as .config)
compiler: riscv64-linux-gcc (GCC) 7.5.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 6bd33e1ece528f67646db33bf97406b747dafda0
# save the attached .config to linux build tree
GCC_VERSION=7.5.0 make.cross ARCH=riscv

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All error/warnings (new ones prefixed by >>):

include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/scatterlist.h:145:18: note: in expansion of macro 'virt_to_page'
sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:12:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/mm.h:10,
from include/linux/pagemap.h:8,
from fs//cifs/smb2ops.c:8:
include/linux/scatterlist.h: In function 'sg_phys':
include/asm-generic/memory_model.h:55:54: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
^
include/linux/pfn.h:21:36: note: in definition of macro 'PFN_PHYS'
#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)
^
arch/riscv/include/asm/page.h:115:29: note: in expansion of macro 'pfn_to_phys'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/asm-generic/memory_model.h:81:21: note: in expansion of macro '__page_to_pfn'
#define page_to_pfn __page_to_pfn
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:115:41: note: in expansion of macro 'page_to_pfn'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/linux/scatterlist.h:224:9: note: in expansion of macro 'page_to_phys'
return page_to_phys(sg_page(sg)) + sg->offset;
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:131:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/mm.h:10,
from include/linux/pagemap.h:8,
from fs//cifs/smb2ops.c:8:
include/linux/scatterlist.h: In function 'sg_page_iter_page':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
include/linux/mm.h:213:26: note: in expansion of macro 'pfn_to_page'
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
^~~~~~~~~~~
include/linux/scatterlist.h:384:9: note: in expansion of macro 'nth_page'
return nth_page(sg_page(piter->sg), piter->sg_pgoffset);
^~~~~~~~
include/linux/dma-mapping.h: In function 'dma_map_single_attrs':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/dma-mapping.h:587:33: note: in expansion of macro 'virt_to_page'
return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:131:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/mm.h:10,
from include/linux/pagemap.h:8,
from fs//cifs/smb2ops.c:8:
fs//cifs/smb2ops.c: In function 'smb2_sg_set_buf':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
>> fs//cifs/smb2ops.c:3542:10: note: in expansion of macro 'virt_to_page'
addr = virt_to_page(buf);
^~~~~~~~~~~~
In file included from include/linux/pagemap.h:8:0,
from fs//cifs/smb2ops.c:8:
include/linux/mm.h: In function 'lowmem_page_address':
include/linux/mm.h:1322:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
--
from include/linux/module.h:10,
from drivers//staging/comedi/comedi_fops.c:14:
include/linux/scatterlist.h: In function 'sg_set_buf':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/scatterlist.h:145:18: note: in expansion of macro 'virt_to_page'
sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:12:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/seqlock.h:36,
from include/linux/time.h:6,
from include/linux/stat.h:19,
from include/linux/module.h:10,
from drivers//staging/comedi/comedi_fops.c:14:
include/linux/scatterlist.h: In function 'sg_phys':
include/asm-generic/memory_model.h:55:54: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
^
include/linux/pfn.h:21:36: note: in definition of macro 'PFN_PHYS'
#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)
^
arch/riscv/include/asm/page.h:115:29: note: in expansion of macro 'pfn_to_phys'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/asm-generic/memory_model.h:81:21: note: in expansion of macro '__page_to_pfn'
#define page_to_pfn __page_to_pfn
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:115:41: note: in expansion of macro 'page_to_pfn'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/linux/scatterlist.h:224:9: note: in expansion of macro 'page_to_phys'
return page_to_phys(sg_page(sg)) + sg->offset;
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:131:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/seqlock.h:36,
from include/linux/time.h:6,
from include/linux/stat.h:19,
from include/linux/module.h:10,
from drivers//staging/comedi/comedi_fops.c:14:
include/linux/scatterlist.h: In function 'sg_page_iter_page':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
include/linux/mm.h:213:26: note: in expansion of macro 'pfn_to_page'
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
^~~~~~~~~~~
include/linux/scatterlist.h:384:9: note: in expansion of macro 'nth_page'
return nth_page(sg_page(piter->sg), piter->sg_pgoffset);
^~~~~~~~
include/linux/dma-mapping.h: In function 'dma_map_single_attrs':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/dma-mapping.h:587:33: note: in expansion of macro 'virt_to_page'
return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
^~~~~~~~~~~~
drivers//staging/comedi/comedi_fops.c: In function 'comedi_mmap':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:55:46: note: in definition of macro '__page_to_pfn'
#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
^~~~
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
drivers//staging/comedi/comedi_fops.c:2378:22: note: in expansion of macro 'virt_to_page'
pfn = page_to_pfn(virt_to_page(buf->virt_addr));
^~~~~~~~~~~~
>> drivers//staging/comedi/comedi_fops.c:2380:8: error: 'PAGE_SHARED' undeclared (first use in this function); did you mean 'PAGE_SIZE'?
PAGE_SHARED);
^~~~~~~~~~~
PAGE_SIZE
--
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/scatterlist.h:145:18: note: in expansion of macro 'virt_to_page'
sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:12:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/slab.h:15,
from net//sunrpc/xprtsock.c:24:
include/linux/scatterlist.h: In function 'sg_phys':
include/asm-generic/memory_model.h:55:54: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __page_to_pfn(page) (unsigned long)((page) - vmemmap)
^
include/linux/pfn.h:21:36: note: in definition of macro 'PFN_PHYS'
#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT)
^
arch/riscv/include/asm/page.h:115:29: note: in expansion of macro 'pfn_to_phys'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/asm-generic/memory_model.h:81:21: note: in expansion of macro '__page_to_pfn'
#define page_to_pfn __page_to_pfn
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:115:41: note: in expansion of macro 'page_to_pfn'
#define page_to_phys(page) (pfn_to_phys(page_to_pfn(page)))
^~~~~~~~~~~
include/linux/scatterlist.h:224:9: note: in expansion of macro 'page_to_phys'
return page_to_phys(sg_page(sg)) + sg->offset;
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:131:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/slab.h:15,
from net//sunrpc/xprtsock.c:24:
include/linux/scatterlist.h: In function 'sg_page_iter_page':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
include/linux/mm.h:213:26: note: in expansion of macro 'pfn_to_page'
#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n))
^~~~~~~~~~~
include/linux/scatterlist.h:384:9: note: in expansion of macro 'nth_page'
return nth_page(sg_page(piter->sg), piter->sg_pgoffset);
^~~~~~~~
include/linux/dma-mapping.h: In function 'dma_map_single_attrs':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
include/linux/dma-mapping.h:587:33: note: in expansion of macro 'virt_to_page'
return dma_map_page_attrs(dev, virt_to_page(ptr), offset_in_page(ptr),
^~~~~~~~~~~~
In file included from arch/riscv/include/asm/page.h:131:0,
from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:38,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/spinlock.h:51,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/slab.h:15,
from net//sunrpc/xprtsock.c:24:
net//sunrpc/xprtsock.c: In function 'bc_sendto':
include/asm-generic/memory_model.h:54:29: error: 'vmemmap' undeclared (first use in this function); did you mean 'vm_mmap'?
#define __pfn_to_page(pfn) (vmemmap + (pfn))
^
include/asm-generic/memory_model.h:82:21: note: in expansion of macro '__pfn_to_page'
#define pfn_to_page __pfn_to_page
^~~~~~~~~~~~~
arch/riscv/include/asm/page.h:112:30: note: in expansion of macro 'pfn_to_page'
#define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr)))
^~~~~~~~~~~
>> net//sunrpc/xprtsock.c:2668:14: note: in expansion of macro 'virt_to_page'
tailpage = virt_to_page(xbufp->tail[0].iov_base);
^~~~~~~~~~~~
In file included from include/linux/pagemap.h:8:0,
from net//sunrpc/xprtsock.c:27:
include/linux/mm.h: In function 'lowmem_page_address':
include/linux/mm.h:1322:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
..

vim +2380 drivers//staging/comedi/comedi_fops.c

ed9eccbe8970f6 David Schleef 2008-11-04 2296
ed9eccbe8970f6 David Schleef 2008-11-04 2297 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
ed9eccbe8970f6 David Schleef 2008-11-04 2298 {
20f083c07565cb Ian Abbott 2014-11-04 2299 struct comedi_file *cfp = file->private_data;
20f083c07565cb Ian Abbott 2014-11-04 2300 struct comedi_device *dev = cfp->dev;
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2301 struct comedi_subdevice *s;
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2302 struct comedi_async *async;
b34aa86f12e884 Ian Abbott 2014-04-10 2303 struct comedi_buf_map *bm = NULL;
e36472145aa706 Ian Abbott 2019-06-25 2304 struct comedi_buf_page *buf;
ed9eccbe8970f6 David Schleef 2008-11-04 2305 unsigned long start = vma->vm_start;
ed9eccbe8970f6 David Schleef 2008-11-04 2306 unsigned long size;
ed9eccbe8970f6 David Schleef 2008-11-04 2307 int n_pages;
ed9eccbe8970f6 David Schleef 2008-11-04 2308 int i;
e36472145aa706 Ian Abbott 2019-06-25 2309 int retval = 0;
3ffab428f40849 Bernd Porr 2011-11-08 2310
b34aa86f12e884 Ian Abbott 2014-04-10 2311 /*
b34aa86f12e884 Ian Abbott 2014-04-10 2312 * 'trylock' avoids circular dependency with current->mm->mmap_sem
b34aa86f12e884 Ian Abbott 2014-04-10 2313 * and down-reading &dev->attach_lock should normally succeed without
b34aa86f12e884 Ian Abbott 2014-04-10 2314 * contention unless the device is in the process of being attached
b34aa86f12e884 Ian Abbott 2014-04-10 2315 * or detached.
b34aa86f12e884 Ian Abbott 2014-04-10 2316 */
b34aa86f12e884 Ian Abbott 2014-04-10 2317 if (!down_read_trylock(&dev->attach_lock))
b34aa86f12e884 Ian Abbott 2014-04-10 2318 return -EAGAIN;
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2319
ed9eccbe8970f6 David Schleef 2008-11-04 2320 if (!dev->attached) {
272850f07c47ab H Hartley Sweeten 2013-11-26 2321 dev_dbg(dev->class_dev, "no driver attached\n");
ed9eccbe8970f6 David Schleef 2008-11-04 2322 retval = -ENODEV;
ed9eccbe8970f6 David Schleef 2008-11-04 2323 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2324 }
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2325
476b847733636c Greg Kroah-Hartman 2008-11-13 2326 if (vma->vm_flags & VM_WRITE)
20f083c07565cb Ian Abbott 2014-11-04 2327 s = comedi_file_write_subdevice(file);
476b847733636c Greg Kroah-Hartman 2008-11-13 2328 else
20f083c07565cb Ian Abbott 2014-11-04 2329 s = comedi_file_read_subdevice(file);
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2330 if (!s) {
ed9eccbe8970f6 David Schleef 2008-11-04 2331 retval = -EINVAL;
ed9eccbe8970f6 David Schleef 2008-11-04 2332 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2333 }
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2334
ed9eccbe8970f6 David Schleef 2008-11-04 2335 async = s->async;
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2336 if (!async) {
ed9eccbe8970f6 David Schleef 2008-11-04 2337 retval = -EINVAL;
ed9eccbe8970f6 David Schleef 2008-11-04 2338 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2339 }
ed9eccbe8970f6 David Schleef 2008-11-04 2340
ed9eccbe8970f6 David Schleef 2008-11-04 2341 if (vma->vm_pgoff != 0) {
272850f07c47ab H Hartley Sweeten 2013-11-26 2342 dev_dbg(dev->class_dev, "mmap() offset must be 0.\n");
ed9eccbe8970f6 David Schleef 2008-11-04 2343 retval = -EINVAL;
ed9eccbe8970f6 David Schleef 2008-11-04 2344 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2345 }
ed9eccbe8970f6 David Schleef 2008-11-04 2346
ed9eccbe8970f6 David Schleef 2008-11-04 2347 size = vma->vm_end - vma->vm_start;
ed9eccbe8970f6 David Schleef 2008-11-04 2348 if (size > async->prealloc_bufsz) {
ed9eccbe8970f6 David Schleef 2008-11-04 2349 retval = -EFAULT;
ed9eccbe8970f6 David Schleef 2008-11-04 2350 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2351 }
44b8c793fc0d63 Sandhya Bankar 2016-03-06 2352 if (offset_in_page(size)) {
ed9eccbe8970f6 David Schleef 2008-11-04 2353 retval = -EFAULT;
ed9eccbe8970f6 David Schleef 2008-11-04 2354 goto done;
ed9eccbe8970f6 David Schleef 2008-11-04 2355 }
ed9eccbe8970f6 David Schleef 2008-11-04 2356
ec9d0754e0c640 sayli karnik 2016-09-20 2357 n_pages = vma_pages(vma);
b34aa86f12e884 Ian Abbott 2014-04-10 2358
b34aa86f12e884 Ian Abbott 2014-04-10 2359 /* get reference to current buf map (if any) */
b34aa86f12e884 Ian Abbott 2014-04-10 2360 bm = comedi_buf_map_from_subdev_get(s);
af93da31634d6d Ian Abbott 2013-11-08 2361 if (!bm || n_pages > bm->n_pages) {
af93da31634d6d Ian Abbott 2013-11-08 2362 retval = -EINVAL;
af93da31634d6d Ian Abbott 2013-11-08 2363 goto done;
af93da31634d6d Ian Abbott 2013-11-08 2364 }
e36472145aa706 Ian Abbott 2019-06-25 2365 if (bm->dma_dir != DMA_NONE) {
e36472145aa706 Ian Abbott 2019-06-25 2366 /*
e36472145aa706 Ian Abbott 2019-06-25 2367 * DMA buffer was allocated as a single block.
e36472145aa706 Ian Abbott 2019-06-25 2368 * Address is in page_list[0].
e36472145aa706 Ian Abbott 2019-06-25 2369 */
e36472145aa706 Ian Abbott 2019-06-25 2370 buf = &bm->page_list[0];
e36472145aa706 Ian Abbott 2019-06-25 2371 retval = dma_mmap_coherent(bm->dma_hw_dev, vma, buf->virt_addr,
e36472145aa706 Ian Abbott 2019-06-25 2372 buf->dma_addr, n_pages * PAGE_SIZE);
e36472145aa706 Ian Abbott 2019-06-25 2373 } else {
ed9eccbe8970f6 David Schleef 2008-11-04 2374 for (i = 0; i < n_pages; ++i) {
e36472145aa706 Ian Abbott 2019-06-25 2375 unsigned long pfn;
e36472145aa706 Ian Abbott 2019-06-25 2376
e36472145aa706 Ian Abbott 2019-06-25 2377 buf = &bm->page_list[i];
e36472145aa706 Ian Abbott 2019-06-25 2378 pfn = page_to_pfn(virt_to_page(buf->virt_addr));
e36472145aa706 Ian Abbott 2019-06-25 2379 retval = remap_pfn_range(vma, start, pfn, PAGE_SIZE,
e36472145aa706 Ian Abbott 2019-06-25 @2380 PAGE_SHARED);
e36472145aa706 Ian Abbott 2019-06-25 2381 if (retval)
e36472145aa706 Ian Abbott 2019-06-25 2382 break;
a52840a98bbb50 H Hartley Sweeten 2012-12-19 2383
ed9eccbe8970f6 David Schleef 2008-11-04 2384 start += PAGE_SIZE;
ed9eccbe8970f6 David Schleef 2008-11-04 2385 }
e36472145aa706 Ian Abbott 2019-06-25 2386 }
ed9eccbe8970f6 David Schleef 2008-11-04 2387
e36472145aa706 Ian Abbott 2019-06-25 2388 if (retval == 0) {
ed9eccbe8970f6 David Schleef 2008-11-04 2389 vma->vm_ops = &comedi_vm_ops;
af93da31634d6d Ian Abbott 2013-11-08 2390 vma->vm_private_data = bm;
ed9eccbe8970f6 David Schleef 2008-11-04 2391
af93da31634d6d Ian Abbott 2013-11-08 2392 vma->vm_ops->open(vma);
e36472145aa706 Ian Abbott 2019-06-25 2393 }
ed9eccbe8970f6 David Schleef 2008-11-04 2394
ed9eccbe8970f6 David Schleef 2008-11-04 2395 done:
b34aa86f12e884 Ian Abbott 2014-04-10 2396 up_read(&dev->attach_lock);
b34aa86f12e884 Ian Abbott 2014-04-10 2397 comedi_buf_map_put(bm); /* put reference to buf map - okay if NULL */
ed9eccbe8970f6 David Schleef 2008-11-04 2398 return retval;
ed9eccbe8970f6 David Schleef 2008-11-04 2399 }
ed9eccbe8970f6 David Schleef 2008-11-04 2400

:::::: The code at line 2380 was first introduced by commit
:::::: e36472145aa706c186a6bb4f6419c613b0b1305c staging: comedi: use dma_mmap_coherent for DMA-able buffer mmap

:::::: TO: Ian Abbott <abbotti@xxxxxxxxx>
:::::: CC: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
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https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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