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Commit 3a1ce8aa authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Linus Torvalds
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[PATCH] ppc32: 8xx: update DataTLBMiss exception comment 



On PPC 8xx, the DataTLBMiss handler does not jump directly to the page
fault handler, as was the case in v2.4.

It instead loads an invalid TLB which causes a subsequent DataTLBError
exception.

The comment on top of it haven't been update to reflect the change, though.

Signed-off-by: default avatarMarcelo Tosatti <marcelo.tosatti@cyclades.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 13e886c3

arch/ppc/kernel/head_8xx.S

+5 −7
Original line number Diff line number Diff line
@@ -288,13 +288,11 @@ SystemCall: 
 * For the MPC8xx, this is a software tablewalk to load the instruction

 * TLB.  It is modelled after the example in the Motorola manual.  The task

 * switch loads the M_TWB register with the pointer to the first level table.

 * If we discover there is no second level table (the value is zero), the

 * plan was to load that into the TLB, which causes another fault into the

 * TLB Error interrupt where we can handle such problems.  However, that did

 * not work, so if we discover there is no second level table, we restore

 * registers and branch to the error exception.  We have to use the MD_xxx

 * registers for the tablewalk because the equivalent MI_xxx registers

 * only perform the attribute functions.

 * If we discover there is no second level table (value is zero) or if there

 * is an invalid pte, we load that into the TLB, which causes another fault

 * into the TLB Error interrupt where we can handle such problems.

 * We have to use the MD_xxx registers for the tablewalk because the

 * equivalent MI_xxx registers only perform the attribute functions.

 */

InstructionTLBMiss:

#ifdef CONFIG_8xx_CPU6