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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-24 12:58:39 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-04-26 09:07:05 +0200
commit616498813b11ffefe1ed36b9f2e4fd2cdbd22f15 (patch)
tree1748b3171ab5cf1ada0c0bbeef285352c37edfcd /arch/arm/boot
parentdc7ee00d4771b3218b10e09e1071ee6eb176d381 (diff)
downloadop-kernel-dev-616498813b11ffefe1ed36b9f2e4fd2cdbd22f15.zip
op-kernel-dev-616498813b11ffefe1ed36b9f2e4fd2cdbd22f15.tar.gz
s390: system call path micro optimization
Add a pointer to the system call table to the thread_info structure. The TIF_31BIT bit is set or cleared by SET_PERSONALITY exactly once for the lifetime of a process. With the pointer to the correct system call table in thread_info the system call code in entry64.S path can drop the check for TIF_31BIT which saves a couple of instructions. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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