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authorMichael Ellerman <mpe@ellerman.id.au>2016-07-26 08:29:29 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2016-09-13 10:37:03 +0300
commit27510235dd2bb1ab01d27b01f0b6180eb47aa003 (patch)
treebd4e7d172384a91f77a7902534da9955392b6d2d /arch/powerpc/include/asm/exception-64s.h
parentf0f558b131db0e793fd90aac5d93f694362973d2 (diff)
downloadlinux-27510235dd2bb1ab01d27b01f0b6180eb47aa003.tar.xz
powerpc/64: Correct comment on LOAD_HANDLER()
The comment for LOAD_HANDLER() was wrong. The part about kdump has not been true since 1f6a93e4c35e ("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>
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
-rw-r--r--arch/powerpc/include/asm/exception-64s.h8
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h
index bed66e5743b3..1a9afded909f 100644
--- a/arch/powerpc/include/asm/exception-64s.h
+++ b/arch/powerpc/include/asm/exception-64s.h
@@ -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 */