[ardb:x86-efistub-cleanup 10/12] drivers/firmware/efi/libstub/x86-stub.c:853: Error: incorrect register `%eax' used with `w' suffix

[ardb:x86-efistub-cleanup 10/12] drivers/firmware/efi/libstub/x86-stub.c:853: Error: incorrect register `%eax' used with `w' suffix

[kernel test robot]

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git x86-efistub-cleanup
head:   d19cef90fb0bff9916366748b6bd1ac55247a86b
commit: df8c0dbe82d9b25c99e9dff452f92ed90362f70f [10/12] x86: efistub: Perform 4/5 level paging switch from the stub
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20230504/202305040620.THfjNpr2-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=df8c0dbe82d9b25c99e9dff452f92ed90362f70f
        git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
        git fetch --no-tags ardb x86-efistub-cleanup
        git checkout df8c0dbe82d9b25c99e9dff452f92ed90362f70f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305040620.THfjNpr2-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/firmware/efi/libstub/x86-stub.c: Assembler messages:
>> drivers/firmware/efi/libstub/x86-stub.c:853: Error: incorrect register `%eax' used with `w' suffix
   drivers/firmware/efi/libstub/x86-stub.c:854: Error: incorrect register `%eax' used with `w' suffix


vim +853 drivers/firmware/efi/libstub/x86-stub.c

   811	
   812	static void efi_5level_switch(void)
   813	{
   814	#ifdef CONFIG_X86_64
   815		static const struct desc_struct gdt[] = {
   816			[GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff),
   817			[GDT_ENTRY_KERNEL_CS]   = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff),
   818			[GDT_ENTRY_KERNEL_DS]   = GDT_ENTRY_INIT(0xc093, 0, 0xfffff),
   819		};
   820	
   821		bool want_la57 = IS_ENABLED(CONFIG_X86_5LEVEL) && !efi_no5lvl;
   822		bool have_la57 = native_read_cr4() & X86_CR4_LA57;
   823		bool need_toggle = want_la57 ^ have_la57;
   824		u64 *pgt = (void *)la57_toggle + PAGE_SIZE;
   825		u64 *cr3 = (u64 *)__native_read_cr3();
   826		struct desc_ptr desc;
   827		u64 *new_cr3;
   828	
   829		if (!la57_toggle || !need_toggle)
   830			return;
   831	
   832		if (!have_la57) {
   833			/*
   834			 * We are going to enable 5 level paging, so we need to
   835			 * allocate a root level page from the 32-bit addressable
   836			 * physical region, and plug the existing hierarchy into it.
   837			 */
   838			new_cr3 = memset(pgt, 0, PAGE_SIZE);
   839			new_cr3[0] = (u64)cr3 | _PAGE_TABLE_NOENC;
   840		} else {
   841			// take the new root table pointer from the current entry #0
   842			new_cr3 = (u64 *)(cr3[0] & PAGE_MASK);
   843	
   844			// copy the new root level table if it is not 32-bit addressable
   845			if ((u64)new_cr3 > U32_MAX)
   846				new_cr3 = memcpy(pgt, new_cr3, PAGE_SIZE);
   847		}
   848	
   849		desc.size       = sizeof(gdt) - 1;
   850		desc.address    = (u64)gdt;
   851	
   852		asm("	lgdt	%[gdt]			\n\t"
 > 853		    "	movw	%[ds], %%ds		\n\t"
   854		    "	movw	%[ds], %%ss		\n\t"
   855		    :
   856		    :	[gdt]	"m"(desc),
   857			[ds]	"r"(__KERNEL_DS));
   858	
   859		la57_toggle(new_cr3, want_la57);
   860	#endif
   861	}
   862	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests