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access_ok and CONFIG_MIPS32 for 2.6

Subject: access_ok and CONFIG_MIPS32 for 2.6
From: Dimitri Torfs <>
Date: Fri, 2 Jan 2004 15:59:41 +0100
Original-recipient: rfc822;
User-agent: Mutt/1.4.1i

  the mask used in access_ok to check the validity of an address range
  evaluates to -TASK_SIZE for user processes. In case of
  CONFIG_MIPS32, TASK_SIZE is defined as 0x7fff8000UL, so -TASK_SIZE
  evaluates to 0x80008000, making access_ok return false for all
  addresses with bit 15 and 31 set. Surely the mask should be 0x80000000. 

  Does anybody know why TASK_SIZE is set to 0x7fff8000 and not
  0x80000000 ?


Dimitri Torfs             |  NSCE |  Sint Stevens Woluwestraat 55
tel: +32 2 2908451        |  1130 Brussel
fax: +32 2 7262686        |  Belgium

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