[PATCH 3/8] x86/platform/uv: Add return code to UV BIOS Init function

[Mike Travis]

Add a return code to the UV BIOS init function that indicates the 
successful initialization of the kernel/BIOS callback interface.

Signed-off-by: Mike Travis <mike.tra...@hpe.com>
Reviewed-by: Steve Wahl <steve.w...@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivan...@hpe.com>
To: Thomas Gleixner <t...@linutronix.de>
To: Ingo Molnar <mi...@redhat.com>
To: H. Peter Anvin <h...@zytor.com>
To: Andrew Morton <a...@linux-foundation.org>
To: Borislav Petkov <b...@alien8.de>
To: Christoph Hellwig <h...@infradead.org>
To: Sasha Levin <sas...@kernel.org>
Cc: Dimitri Sivanich <dimitri.sivan...@hpe.com>
Cc: Russ Anderson <russ.ander...@hpe.com>
Cc: Hedi Berriche <hedi.berri...@hpe.com>
Cc: Steve Wahl <steve.w...@hpe.com>
Cc: Justin Ernst <justin.er...@hpe.com>
Cc: x...@kernel.org
Cc: linux-kernel@vger.kernel.org
---
 arch/x86/include/asm/uv/bios.h |    2 +-
 arch/x86/platform/uv/bios_uv.c |    9 +++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

--- linux.orig/arch/x86/include/asm/uv/bios.h
+++ linux/arch/x86/include/asm/uv/bios.h
@@ -138,7 +138,7 @@ extern s64 uv_bios_change_memprotect(u64
 extern s64 uv_bios_reserved_page_pa(u64, u64 *, u64 *, u64 *);
 extern int uv_bios_set_legacy_vga_target(bool decode, int domain, int bus);
 
-extern void uv_bios_init(void);
+extern int uv_bios_init(void);
 
 extern unsigned long sn_rtc_cycles_per_second;
 extern int uv_type;
--- linux.orig/arch/x86/platform/uv/bios_uv.c
+++ linux/arch/x86/platform/uv/bios_uv.c
@@ -184,20 +184,20 @@ int uv_bios_set_legacy_vga_target(bool d
 }
 EXPORT_SYMBOL_GPL(uv_bios_set_legacy_vga_target);
 
-void uv_bios_init(void)
+int uv_bios_init(void)
 {
        uv_systab = NULL;
        if ((uv_systab_phys == EFI_INVALID_TABLE_ADDR) ||
            !uv_systab_phys || efi_runtime_disabled()) {
                pr_crit("UV: UVsystab: missing\n");
-               return;
+               return -EEXIST;
        }
 
        uv_systab = ioremap(uv_systab_phys, sizeof(struct uv_systab));
        if (!uv_systab || strncmp(uv_systab->signature, UV_SYSTAB_SIG, 4)) {
                pr_err("UV: UVsystab: bad signature!\n");
                iounmap(uv_systab);
-               return;
+               return -EINVAL;
        }
 
        /* Starting with UV4 the UV systab size is variable */
@@ -208,8 +208,9 @@ void uv_bios_init(void)
                uv_systab = ioremap(uv_systab_phys, size);
                if (!uv_systab) {
                        pr_err("UV: UVsystab: ioremap(%d) failed!\n", size);
-                       return;
+                       return -EFAULT;
                }
        }
        pr_info("UV: UVsystab: Revision:%x\n", uv_systab->revision);
+       return 0;
 }

--