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authorPaul Mackerras <paulus@samba.org>2010-05-06 19:46:50 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-05-21 17:31:08 +1000
commite62cee42e66dcca83aae02748535f62e0f564a0c (patch)
tree16cbe9c621aedd7b2c536a0c1f2fa90ae4eb9d2b /arch/powerpc
parentabb17f9c3a92c5acf30e749efdf0419b7f50a5b8 (diff)
powerpc: Avoid bad relocations in iSeries code
Subrata Modak reported that building a CONFIG_RELOCATABLE kernel with CONFIG_ISERIES enabled gives the following warnings: WARNING: 4 bad relocations c00000000007216e R_PPC64_ADDR16_HIGHEST __ksymtab+0x00000000009dcec8 c000000000072172 R_PPC64_ADDR16_HIGHER __ksymtab+0x00000000009dcec8 c00000000007217a R_PPC64_ADDR16_HI __ksymtab+0x00000000009dcec8 c00000000007217e R_PPC64_ADDR16_LO __ksymtab+0x00000000009dcec8 The reason is that decrementer_iSeries_masked is using LOAD_REG_IMMEDIATE to get the address of a kernel symbol, which creates relocations that aren't handled by the kernel relocator code. Instead of reading the tb_ticks_per_jiffy variable, we can just set the decrementer to its maximum value (0x7fffffff) and that will work just as well. In fact timer_interrupt sets the decrementer to that value initially anyway, and we are sure to get into timer_interrupt once interrupts are reenabled because we store 1 to the decrementer interrupt flag in the lppaca (LPPACADECRINT(r12) here). Reported-by: Subrata Modak <subrata@linux.vnet.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/iseries/exception.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S
index fba5bf915073..32a56c6dfa72 100644
--- a/arch/powerpc/platforms/iseries/exception.S
+++ b/arch/powerpc/platforms/iseries/exception.S
@@ -252,8 +252,8 @@ decrementer_iSeries_masked:
li r11,1
ld r12,PACALPPACAPTR(r13)
stb r11,LPPACADECRINT(r12)
- LOAD_REG_IMMEDIATE(r12, tb_ticks_per_jiffy)
- lwz r12,0(r12)
+ li r12,-1
+ clrldi r12,r12,33 /* set DEC to 0x7fffffff */
mtspr SPRN_DEC,r12
/* fall through */