forked from mirrors/linux
998c2034c6
Kbuild test robot reports the following problem on ARM:
for 'xen_setup_callback_vector' [-Wmissing-prototypes]
1664 | void xen_setup_callback_vector(void) {}
| ^~~~~~~~~~~~~~~~~~~~~~~~~
The problem is that xen_setup_callback_vector is a x86 only thing, its
definition is present in arch/x86/xen/xen-ops.h but not on ARM. In
events_base.c there is a stub for !CONFIG_XEN_PVHVM but it is not declared
as 'static'.
On x86 the situation is hardly better: drivers/xen/events/events_base.c
doesn't include 'xen-ops.h' from arch/x86/xen/, it includes its namesake
from include/xen/ which also results in a 'no previous prototype' warning.
Currently, xen_setup_callback_vector() has two call sites: one in
drivers/xen/events_base.c and another in arch/x86/xen/suspend_hvm.c. The
former is placed under #ifdef CONFIG_X86 and the later is only compiled
in when CONFIG_XEN_PVHVM.
Resolve the issue by moving xen_setup_callback_vector() declaration to
arch neutral 'include/xen/hvm.h' as the implementation lives in arch
neutral drivers/xen/events/events_base.c.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/20200520161600.361895-1-vkuznets@redhat.com
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Simple wrappers around HVM functions */
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#ifndef XEN_HVM_H__
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#define XEN_HVM_H__
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#include <xen/interface/hvm/params.h>
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#include <asm/xen/hypercall.h>
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static const char *param_name(int op)
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{
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#define PARAM(x) [HVM_PARAM_##x] = #x
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static const char *const names[] = {
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PARAM(CALLBACK_IRQ),
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PARAM(STORE_PFN),
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PARAM(STORE_EVTCHN),
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PARAM(PAE_ENABLED),
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PARAM(IOREQ_PFN),
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PARAM(BUFIOREQ_PFN),
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PARAM(TIMER_MODE),
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PARAM(HPET_ENABLED),
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PARAM(IDENT_PT),
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PARAM(DM_DOMAIN),
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PARAM(ACPI_S_STATE),
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PARAM(VM86_TSS),
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PARAM(VPT_ALIGN),
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PARAM(CONSOLE_PFN),
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PARAM(CONSOLE_EVTCHN),
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};
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#undef PARAM
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if (op >= ARRAY_SIZE(names))
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return "unknown";
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if (!names[op])
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return "reserved";
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return names[op];
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}
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static inline int hvm_get_parameter(int idx, uint64_t *value)
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{
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struct xen_hvm_param xhv;
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int r;
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xhv.domid = DOMID_SELF;
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xhv.index = idx;
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r = HYPERVISOR_hvm_op(HVMOP_get_param, &xhv);
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if (r < 0) {
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pr_err("Cannot get hvm parameter %s (%d): %d!\n",
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param_name(idx), idx, r);
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return r;
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}
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*value = xhv.value;
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return r;
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}
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#define HVM_CALLBACK_VIA_TYPE_VECTOR 0x2
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#define HVM_CALLBACK_VIA_TYPE_SHIFT 56
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#define HVM_CALLBACK_VECTOR(x) (((uint64_t)HVM_CALLBACK_VIA_TYPE_VECTOR)<<\
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HVM_CALLBACK_VIA_TYPE_SHIFT | (x))
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void xen_setup_callback_vector(void);
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#endif /* XEN_HVM_H__ */
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