mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-15 15:15:47 +00:00
c7341d6a61
Compiler complains in the following way when x86 32-bit kernel with Xen support is build: CC arch/x86/xen/enlighten.o arch/x86/xen/enlighten.c: In function ‘xen_start_kernel’: arch/x86/xen/enlighten.c:1726:3: warning: right shift count >= width of type [enabled by default] Such line contains following EFI initialization code: boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32); There is no issue if x86 64-bit kernel is build. However, 32-bit case generate warning (even if that code will not be executed because Xen does not work on 32-bit EFI platforms) due to __pa() returning unsigned long type which has 32-bits width. So move whole EFI initialization stuff to separate function and build it conditionally to avoid above mentioned warning on x86 32-bit architecture. Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com> Reviewed-by: Konrad Rzeszutek Wilk <Konrad.wilk@oracle.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2014 Oracle Co., Daniel Kiper
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/efi.h>
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <xen/xen-ops.h>
|
|
|
|
#include <asm/setup.h>
|
|
|
|
void __init xen_efi_init(void)
|
|
{
|
|
efi_system_table_t *efi_systab_xen;
|
|
|
|
efi_systab_xen = xen_efi_probe();
|
|
|
|
if (efi_systab_xen == NULL)
|
|
return;
|
|
|
|
strncpy((char *)&boot_params.efi_info.efi_loader_signature, "Xen",
|
|
sizeof(boot_params.efi_info.efi_loader_signature));
|
|
boot_params.efi_info.efi_systab = (__u32)__pa(efi_systab_xen);
|
|
boot_params.efi_info.efi_systab_hi = (__u32)(__pa(efi_systab_xen) >> 32);
|
|
|
|
set_bit(EFI_BOOT, &efi.flags);
|
|
set_bit(EFI_PARAVIRT, &efi.flags);
|
|
set_bit(EFI_64BIT, &efi.flags);
|
|
}
|