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There is a small race window in the __switch_to code in regard to the transfer of the TIF_MCCK_PENDING bit from the previous to the next task. The bit is transferred before the task struct pointer and the thread-info pointer for the next task has been stored to lowcore. If a machine check sets the TIF_MCCK_PENDING bit between the transfer code and the store of current/thread_info the bit is still set for the previous task. And if the previous task has terminated it can get lost. The effect is that a pending CRW is not retrieved until the next machine checks sets TIF_MCCK_PENDING. To fix this reorder __switch_to to first store the task struct and thread-info pointer and then do the transfer of the bit. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
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alpha | ||
arm | ||
avr32 | ||
blackfin | ||
c6x | ||
cris | ||
frv | ||
h8300 | ||
hexagon | ||
ia64 | ||
m32r | ||
m68k | ||
microblaze | ||
mips | ||
mn10300 | ||
openrisc | ||
parisc | ||
powerpc | ||
s390 | ||
score | ||
sh | ||
sparc | ||
tile | ||
um | ||
unicore32 | ||
x86 | ||
xtensa | ||
.gitignore | ||
Kconfig |