)]}'
{
  "commit": "618febd6784054eea928d712b7e564558a7cefd5",
  "tree": "13a60c377dc5a17f44e9b3b227e5996e0ba7e5a4",
  "parents": [
    "b2450cc1b7ce07d73545ece32db50197d649e230"
  ],
  "author": {
    "name": "James Bottomley",
    "email": "jejb@parisc-linux.org",
    "time": "Fri Oct 21 22:53:26 2005 -0400"
  },
  "committer": {
    "name": "Kyle McMartin",
    "email": "kyle@parisc-linux.org",
    "time": "Fri Oct 21 22:53:26 2005 -0400"
  },
  "message": "[PARISC] Fix the alloc_slabmgmt panic\n\nFix the alloc_slabmgmt panic\n\nHopefully this should also fix a lot of other intermittent kernel bugs.\n\nThe problem has been around since 2.6.9-rc2-pa6 when we allowed\nfloating point registers to be used in kernel code.  The essence of\nthe problem is that gcc prefers to use floating point for integer\ndivides and multiples.  Further, it can rely on the values in the no\nclobber fp regs being correct across a function call.  Unfortunately,\nour task switch function only saves the integer no clobber registers,\nnot the fp ones, so if gcc makes a function call to any function in\nthe kernel which could sleep, the values it is relying on in any no\nclobber floating point register may be lost.  In the case of\nalloc_slabmgmt, the value of the page offset is being stored in %fr12\nacross a call to kmem_getpages(), which sleeps if no pages are\navailable.  Thus, the offset can be trashed and the slab code can end\nup with a completely bogus address leading to corruption.\n\nKudos to Randolph who came up with the program to trip this problem at\nwill and thus allowed it to be tracked and fixed.\n\nSigned-off-by: James Bottomley \u003cjejb@parisc-linux.org\u003e\n\nSigned-off-by: Kyle McMartin \u003ckyle@parisc-linux.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "0ca49710d95e66f6fdaf34949458023ce8631778",
      "old_mode": 33188,
      "old_path": "arch/parisc/kernel/entry.S",
      "new_id": "166df5bab769cc7990b10bb802151995c8ccf3df",
      "new_mode": 33188,
      "new_path": "arch/parisc/kernel/entry.S"
    },
    {
      "type": "modify",
      "old_id": "b24a99e3ef9cf31731a81b1a8d8930a47acb0d9e",
      "old_mode": 33188,
      "old_path": "include/asm-parisc/assembly.h",
      "new_id": "fb8bc7c16e0ef973a3b5f36fcb79b878889e16ec",
      "new_mode": 33188,
      "new_path": "include/asm-parisc/assembly.h"
    }
  ]
}