powerpc/64s: Move system_call() symbol to just after setting MSR_EE
It is common to get a PMU interrupt right after the mtmsr instruction that enables interrupts. Due to this, the stack trace profile gets needlessly split across system_call_common() and system_call(). Previously, system_call() symbol was at the current place to hide a few earlier symbols which have since been made private or removed entirely. So, let's move system_call() slightly higher up, right after the mtmsr instruction that enables interrupts. Convert existing references to system_call to a local syscall symbol. Suggested-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -143,6 +143,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
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mtmsrd r11,1
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#endif /* CONFIG_PPC_BOOK3E */
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system_call: /* label this so stack traces look sane */
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/* We do need to set SOFTE in the stack frame or the return
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* from interrupt will be painful
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*/
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@ -156,7 +157,7 @@ END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLPAR)
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cmpldi 0,r0,NR_syscalls
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bge- .Lsyscall_enosys
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system_call: /* label this so stack traces look sane */
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.Lsyscall:
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/*
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* Need to vector to 32 Bit or default sys_call_table here,
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* based on caller's run-mode / personality.
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@ -310,13 +311,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
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ld r7,GPR7(r1)
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ld r8,GPR8(r1)
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/* Repopulate r9 and r10 for the system_call path */
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/* Repopulate r9 and r10 for the syscall path */
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addi r9,r1,STACK_FRAME_OVERHEAD
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CURRENT_THREAD_INFO(r10, r1)
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ld r10,TI_FLAGS(r10)
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cmpldi r0,NR_syscalls
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blt+ system_call
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blt+ .Lsyscall
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/* Return code is already in r3 thanks to do_syscall_trace_enter() */
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b .Lsyscall_exit
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