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    Subject[patch 1/5] -fstack-protector feature: annotate the PDA offsets
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    Subject: [patch 1/5] Add comments to the PDA structure to annotate offsets
    From: Arjan van de Ven <arjan@linux.intel.com>

    Change the comments in the pda structure to make the first fields to have
    their offset documented and to have the comments aligned.
    The stack protector series needs a field at offset 40 (gcc ABI); annotate
    upto 40 for that reason.

    Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    CC: Andi Kleen <ak@suse.de>
    ---
    include/asm-x86_64/pda.h | 14 ++++++--------
    1 file changed, 6 insertions(+), 8 deletions(-)

    Index: linux-2.6.18-rc4-stackprot/include/asm-x86_64/pda.h
    ===================================================================
    --- linux-2.6.18-rc4-stackprot.orig/include/asm-x86_64/pda.h
    +++ linux-2.6.18-rc4-stackprot/include/asm-x86_64/pda.h
    @@ -9,14 +9,12 @@

    /* Per processor datastructure. %gs points to it while the kernel runs */
    struct x8664_pda {
    - struct task_struct *pcurrent; /* Current process */
    - unsigned long data_offset; /* Per cpu data offset from linker address */
    - unsigned long kernelstack; /* top of kernel stack for current */
    - unsigned long oldrsp; /* user rsp for system call */
    -#if DEBUG_STKSZ > EXCEPTION_STKSZ
    - unsigned long debugstack; /* #DB/#BP stack. */
    -#endif
    - int irqcount; /* Irq nesting counter. Starts with -1 */
    + struct task_struct *pcurrent; /* 0 */ /* Current process */
    + unsigned long data_offset; /* 8 */ /* Per cpu data offset from linker address */
    + unsigned long kernelstack; /* 16 */ /* top of kernel stack for current */
    + unsigned long oldrsp; /* 24 */ /* user rsp for system call */
    + unsigned long debugstack; /* 32 */ /* #DB/#BP stack. */
    + int irqcount; /* 40 */ /* Irq nesting counter. Starts with -1 */
    int cpunumber; /* Logical CPU number */
    char *irqstackptr; /* top of irqstack */
    int nodenumber; /* number of current node */
    -
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