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authorPeter Zijlstra <peterz@infradead.org>2016-11-15 16:47:06 +0100
committerIngo Molnar <mingo@kernel.org>2016-11-22 12:48:11 +0100
commit3cded41794818d788aa1dc028ede4a1c1222d937 (patch)
treeb38f7540e28ee21ccec1e2fb850ff4235041984e /crypto/rng.c
parent05ffc951392df57edecc2519327b169210c3df75 (diff)
downloadop-kernel-dev-3cded41794818d788aa1dc028ede4a1c1222d937.zip
op-kernel-dev-3cded41794818d788aa1dc028ede4a1c1222d937.tar.gz
x86/paravirt: Optimize native pv_lock_ops.vcpu_is_preempted()
Avoid the pointless function call to pv_lock_ops.vcpu_is_preempted() when a paravirt spinlock enabled kernel is ran on native hardware. Do this by patching out the CALL instruction with "XOR %RAX,%RAX" which has the same effect (0 return value). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: benh@kernel.crashing.org Cc: boqun.feng@gmail.com Cc: borntraeger@de.ibm.com Cc: bsingharora@gmail.com Cc: dave@stgolabs.net Cc: jgross@suse.com Cc: kernellwp@gmail.com Cc: konrad.wilk@oracle.com Cc: mpe@ellerman.id.au Cc: paulmck@linux.vnet.ibm.com Cc: paulus@samba.org Cc: pbonzini@redhat.com Cc: rkrcmar@redhat.com Cc: will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'crypto/rng.c')
0 files changed, 0 insertions, 0 deletions
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