The SGI BIOS adds UVsystab, and only systems running SGI BIOS
(and now HPE Hawks2) will have UVsystab. And UVsystab is detected in
efi_init() which is at very early stage. So introduce a new helper
function is_early_uv_system() for later usage.
Signed-off-by: Baoquan He <b...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: "H. Peter Anvin" <h...@zytor.com>
Cc: x...@kernel.org
Cc: Russ Anderson <r...@hpe.com>
Cc: Dimitri Sivanich <sivan...@hpe.com>
Cc: "tra...@sgi.com" <tra...@sgi.com>
Cc: Mike Travis <mike.tra...@hpe.com>
Cc: Frank Ramsay <frank.ram...@hpe.com>
---
arch/x86/include/asm/uv/uv.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h
index 6686820..159f698 100644
--- a/arch/x86/include/asm/uv/uv.h
+++ b/arch/x86/include/asm/uv/uv.h
@@ -19,6 +19,11 @@ extern const struct cpumask *uv_flush_tlb_others(const
struct cpumask *cpumask,
unsigned long start,
unsigned long end,
unsigned int cpu);
+#include <linux/efi.h>
+static inline int is_early_uv_system(void)
+{
+ return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab);
+}
#else /* X86_UV */
@@ -31,6 +36,7 @@ static inline const struct cpumask *
uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
unsigned long start, unsigned long end, unsigned int cpu)
{ return cpumask; }
+static inline int is_early_uv_system(void) { return 0; }
#endif /* X86_UV */
--
2.5.5
