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x86/Hyper-V/hv_apic: Build the Hyper-V APIC conditionally 

The Hyper-V APIC code is built when CONFIG_HYPERV is enabled but the actual
code in that file is guarded with CONFIG_X86_64. There is no point in doing
this. Neither is there a point in having the CONFIG_HYPERV guard in there
because the containing directory is not built when CONFIG_HYPERV=n.

Further for the hv_init_apic() function a stub is provided only for
CONFIG_HYPERV=n, which is pointless as the callsite is not compiled at
all. But for X86_32 the stub is missing and the build fails.

Clean that up:

  - Compile hv_apic.c only when CONFIG_X86_64=y
  - Make the stub for hv_init_apic() available when CONFG_X86_64=n

Fixes: 6b48cb5f83 ("X86/Hyper-V: Enlighten APIC access")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Michael Kelley <mikelley@microsoft.com>
This commit is contained in:
Thomas Gleixner 2018-05-19 21:22:48 +02:00
parent 61eeb1f6d1
commit 2d2ccf2493
3 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/hyperv/Makefile
View File

@ -1 +1,2 @@
obj-y := hv_init.o mmu.o hv_apic.o obj-y := hv_init.o mmu.o
obj-$(CONFIG_X86_64) += hv_apic.o

6
arch/x86/hyperv/hv_apic.c
View File

@ -31,9 +31,6 @@
#include <asm/mshyperv.h> #include <asm/mshyperv.h>
#include <asm/apic.h> #include <asm/apic.h>
#ifdef CONFIG_X86_64
#if IS_ENABLED(CONFIG_HYPERV)
static struct apic orig_apic; static struct apic orig_apic;
static u64 hv_apic_icr_read(void) static u64 hv_apic_icr_read(void)
@ -257,6 +254,3 @@ void __init hv_apic_init(void)
apic->icr_read = hv_apic_icr_read; apic->icr_read = hv_apic_icr_read;
} }
} }
#endif /* CONFIG_HYPERV */
#endif /* CONFIG_X86_64 */

7
arch/x86/include/asm/mshyperv.h
View File

@ -302,7 +302,13 @@ void hyperv_reenlightenment_intr(struct pt_regs *regs);
void set_hv_tscchange_cb(void (*cb)(void)); void set_hv_tscchange_cb(void (*cb)(void));
void clear_hv_tscchange_cb(void); void clear_hv_tscchange_cb(void);
void hyperv_stop_tsc_emulation(void); void hyperv_stop_tsc_emulation(void);
#ifdef CONFIG_X86_64
void hv_apic_init(void); void hv_apic_init(void);
#else
static inline void hv_apic_init(void) {}
#endif
#else /* CONFIG_HYPERV */ #else /* CONFIG_HYPERV */
static inline void hyperv_init(void) {} static inline void hyperv_init(void) {}
static inline bool hv_is_hyperv_initialized(void) { return false; } static inline bool hv_is_hyperv_initialized(void) { return false; }
@ -311,7 +317,6 @@ static inline void hyperv_setup_mmu_ops(void) {}
static inline void set_hv_tscchange_cb(void (*cb)(void)) {} static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
static inline void clear_hv_tscchange_cb(void) {} static inline void clear_hv_tscchange_cb(void) {}
static inline void hyperv_stop_tsc_emulation(void) {}; static inline void hyperv_stop_tsc_emulation(void) {};
static inline void hv_apic_init(void) {}
static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu) static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
{ {
return NULL; return NULL;