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powerpc/64: Correct comment on LOAD_HANDLER()

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The comment for LOAD_HANDLER() was wrong. The part about kdump has not
been true since 1f6a93e4c3 ("powerpc: Make it possible to move the
interrupt handlers away from the kernel").

Describe how it currently works, and combine the two separate comments
into one.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Nick Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2016-07-26 15:29:29 +10:00
parent f0f558b131
commit 27510235dd
1 changed files with 4 additions and 4 deletions
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8
arch/powerpc/include/asm/exception-64s.h
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@ -84,12 +84,12 @@
/*
* We're short on space and time in the exception prolog, so we can't
* use the normal SET_REG_IMMEDIATE macro. Normally we just need the
* low halfword of the address, but for Kdump we need the whole low
* word.
* use the normal LOAD_REG_IMMEDIATE macro to load the address of label.
* Instead we get the base of the kernel from paca->kernelbase and or in the low
* part of label. This requires that the label be within 64KB of kernelbase, and
* that kernelbase be 64K aligned.
*/
#define LOAD_HANDLER(reg, label) \
/* Handlers must be within 64K of kbase, which must be 64k aligned */ \
ori reg,reg,(label)-_stext; /* virt addr of handler ... */
/* Exception register prefixes */