)]}'
{
  "commit": "25747cc45825ffc0192779a224d3bb9bc4b9edbd",
  "tree": "eec6ef8ba6fcf4b5177efa110be793568dd8de02",
  "parents": [
    "711cf004f2148f1d1967bc5eca025019e5001212"
  ],
  "author": {
    "name": "Christoffer Dall",
    "email": "cdall@cs.columbia.edu",
    "time": "Fri Dec 21 13:03:50 2012 -0500"
  },
  "committer": {
    "name": "Greg Kroah-Hartman",
    "email": "gregkh@linuxfoundation.org",
    "time": "Fri Jan 11 09:06:48 2013 -0800"
  },
  "message": "mm: Fix PageHead when !CONFIG_PAGEFLAGS_EXTENDED\n\ncommit ad4b3fb7ff9940bcdb1e4cd62bd189d10fa636ba upstream.\n\nUnfortunately with !CONFIG_PAGEFLAGS_EXTENDED, (!PageHead) is false, and\n(PageHead) is true, for tail pages.  If this is indeed the intended\nbehavior, which I doubt because it breaks cache cleaning on some ARM\nsystems, then the nomenclature is highly problematic.\n\nThis patch makes sure PageHead is only true for head pages and PageTail\nis only true for tail pages, and neither is true for non-compound pages.\n\n[ This buglet seems ancient - seems to have been introduced back in Apr\n  2008 in commit 6a1e7f777f61: \"pageflags: convert to the use of new\n  macros\".  And the reason nobody noticed is because the PageHead()\n  tests are almost all about just sanity-checking, and only used on\n  pages that are actual page heads.  The fact that the old code returned\n  true for tail pages too was thus not really noticeable.   - Linus ]\n\nSigned-off-by: Christoffer Dall \u003ccdall@cs.columbia.edu\u003e\nAcked-by:  Andrea Arcangeli \u003caarcange@redhat.com\u003e\nCc: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nCc: Will Deacon \u003cWill.Deacon@arm.com\u003e\nCc: Steve Capper \u003cSteve.Capper@arm.com\u003e\nCc: Christoph Lameter \u003ccl@linux.com\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\nSigned-off-by: Greg Kroah-Hartman \u003cgregkh@linuxfoundation.org\u003e\n\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "c88d2a9451af811bff67e3ee9c8d37c8ef691ef3",
      "old_mode": 33188,
      "old_path": "include/linux/page-flags.h",
      "new_id": "4dabf0fe527e2b8de37101e3a51f82e7aba4c657",
      "new_mode": 33188,
      "new_path": "include/linux/page-flags.h"
    }
  ]
}