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b8ca396f98
It is required to print 'count' of pages, along with the pages, passed to cma_release to debug the cases of mismatched count value passed between cma_alloc() and cma_release() from a code path. As an example, consider the below scenario: 1) CMA pool size is 4MB and 2) User doing the erroneous step of allocating 2 pages but freeing 1 page in a loop from this CMA pool. The step 2 causes cma_alloc() to return NULL at one point of time because of -ENOMEM condition. And the current pr_debug logs is not giving the info about these types of allocation patterns because of count value not being printed in cma_release(). We are printing the count value in the trace logs, just extend the same to pr_debug logs too. [akpm@linux-foundation.org: fix printk warning] Link: https://lkml.kernel.org/r/1606318341-29521-1-git-send-email-charante@codeaurora.org Signed-off-by: Charan Teja Reddy <charante@codeaurora.org> Reviewed-by: Souptick Joarder <jrdr.linux@gmail.com> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Vinayak Menon <vinmenon@codeaurora.org> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.