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| author | Paul Mackerras <paulus@samba.org> | 2010-05-06 19:46:50 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-05-21 17:31:08 +1000 |
| commit | e62cee42e66dcca83aae02748535f62e0f564a0c (patch) | |
| tree | 16cbe9c621aedd7b2c536a0c1f2fa90ae4eb9d2b | |
| parent | abb17f9c3a92c5acf30e749efdf0419b7f50a5b8 (diff) | |
| download | op-kernel-dev-e62cee42e66dcca83aae02748535f62e0f564a0c.zip op-kernel-dev-e62cee42e66dcca83aae02748535f62e0f564a0c.tar.gz | |
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>
| -rw-r--r-- | arch/powerpc/platforms/iseries/exception.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/iseries/exception.S b/arch/powerpc/platforms/iseries/exception.S index fba5bf9..32a56c6 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 */ |
