efi: Get rid of the EFI_SYSTEM_TABLES status bit

The EFI_SYSTEM_TABLES status bit is set by all EFI supporting architectures
upon discovery of the EFI system table, but the bit is never tested in any
code we have in the tree. So remove it.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Luck, Tony <tony.luck@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-2-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/ia64/kernel/efi.c

@@ -531,8 +531,6 @@ efi_init (void)
 	       efi.systab->hdr.revision >> 16,
 	       efi.systab->hdr.revision & 0xffff, vendor);
 
-	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
-
 	palo_phys      = EFI_INVALID_TABLE_ADDR;
 
 	if (efi_config_init(arch_tables) != 0)

arch/x86/platform/efi/efi.c

@@ -352,8 +352,6 @@ static int __init efi_systab_init(void *phys)
 		       efi.systab->hdr.revision >> 16,
 		       efi.systab->hdr.revision & 0xffff);
 
-	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
-
 	return 0;
 }
 

drivers/firmware/efi/arm-runtime.c

@@ -105,7 +105,6 @@ static int __init arm_enable_runtime_services(void)
 		pr_err("Failed to remap EFI System Table\n");
 		return -ENOMEM;
 	}
-	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 
 	if (!efi_virtmap_init()) {
 		pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");

include/linux/efi.h

@@ -1000,7 +1000,6 @@ extern int __init efi_setup_pcdp_console(char *);
  * possible, remove EFI-related code altogether.
  */
 #define EFI_BOOT		0	/* Were we booted from EFI? */
-#define EFI_SYSTEM_TABLES	1	/* Can we use EFI system tables? */
 #define EFI_CONFIG_TABLES	2	/* Can we use EFI config tables? */
 #define EFI_RUNTIME_SERVICES	3	/* Can we use runtime services? */
 #define EFI_MEMMAP		4	/* Can we use EFI memory map? */