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Groups > linux.kernel > #1288467

Re: m(un)map kmalloc buffers to userspace

From Michal Hocko <mhocko@kernel.org>
Newsgroups linux.kernel
Subject Re: m(un)map kmalloc buffers to userspace
Date 2015-12-10 12:50 +0100
Message-ID <qE7Tr-5EP-3@gated-at.bofh.it> (permalink)
References (2 earlier) <qDNBn-Xy-5@gated-at.bofh.it> <qDO4p-1aj-11@gated-at.bofh.it> <qDOnM-1h9-9@gated-at.bofh.it> <qDOH8-1CS-25@gated-at.bofh.it> <qDP0u-1Jn-29@gated-at.bofh.it>
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On Wed 09-12-15 16:35:53, Sebastian Frias wrote:
[...]
> We've seen that drivers/media/pci/zoran/zoran_driver.c for example seems to
> be doing as us kmalloc+remap_pfn_range,

This driver is broken - I will post a patch.

> is there any guarantee (or at least an advised heuristic) to determine
> if a driver is "current" (ie: uses the latest APIs and works)?

OK, it seems I was overly optimistic when directing you to existing
drivers. Sorry about that I wasn't aware you could find such a terrible
code there. Please refer to Linux Device Drivers book which should give
you a much better lead (e.g. http://www.makelinux.net/ldd3/chp-15-sect-2)
-- 
Michal Hocko
SUSE Labs
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Thread

m(un)map kmalloc buffers to userspace Sebastian Frias <sebastian_frias@sigmadesigns.com> - 2015-12-08 18:40 +0100
  Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-09 15:00 +0100
    Re: m(un)map kmalloc buffers to userspace Marc Gonzalez <marc_gonzalez@sigmadesigns.com> - 2015-12-09 15:10 +0100
      Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-09 15:40 +0100
        Re: m(un)map kmalloc buffers to userspace Sebastian Frias <sebastian_frias@sigmadesigns.com> - 2015-12-09 16:00 +0100
          Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-09 16:20 +0100
            Re: m(un)map kmalloc buffers to userspace Sebastian Frias <sebastian_frias@sigmadesigns.com> - 2015-12-09 16:40 +0100
              Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-10 12:50 +0100
                Re: m(un)map kmalloc buffers to userspace Richard Weinberger <richard.weinberger@gmail.com> - 2015-12-10 13:10 +0100
                Re: m(un)map kmalloc buffers to userspace Sebastian Frias <sebastian_frias@sigmadesigns.com> - 2015-12-10 14:40 +0100
                Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-10 15:10 +0100
                Re: m(un)map kmalloc buffers to userspace Sebastian Frias <sebastian_frias@sigmadesigns.com> - 2015-12-10 17:50 +0100
                Re: m(un)map kmalloc buffers to userspace Michal Hocko <mhocko@kernel.org> - 2015-12-11 10:50 +0100

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