linux/arch
Uros Bizjak 767ec7289e x86/uaccess: Use XORL %0,%0 in __get_user_asm()
XORL %0,%0 is equivalent to XORQ %0,%0 as both will zero the entire
register. Use XORL %0,%0 for all operand sizes to avoid REX prefix byte
when legacy registers are used and to avoid size prefix byte when 16bit
registers are used.

Zeroing the full register is OK in this use case.

As a result, the size of the .fixup section decreases by 20 bytes.

 [ bp: Massage commit message. ]

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Link: https://lkml.kernel.org/r/20200827180904.96399-1-ubizjak@gmail.com
2020-09-03 22:49:03 +02:00
..
alpha treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
arc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
arm A set of fixes for lockdep, tracing and RCU: 2020-08-30 11:43:50 -07:00
arm64 A set of fixes for interrupt chip drivers: 2020-08-30 11:56:54 -07:00
c6x treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
csky treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
h8300 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
hexagon treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
ia64 treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
m68k treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
microblaze treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
mips A set of fixes for lockdep, tracing and RCU: 2020-08-30 11:43:50 -07:00
nds32 A set of fixes for lockdep, tracing and RCU: 2020-08-30 11:43:50 -07:00
nios2 mm/nios2: use general page fault accounting 2020-08-12 10:58:03 -07:00
openrisc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
parisc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
powerpc A set of fixes for lockdep, tracing and RCU: 2020-08-30 11:43:50 -07:00
riscv treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
s390 A set of fixes for lockdep, tracing and RCU: 2020-08-30 11:43:50 -07:00
sh treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
sparc treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
um treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
x86 x86/uaccess: Use XORL %0,%0 in __get_user_asm() 2020-09-03 22:49:03 +02:00
xtensa treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
.gitignore
Kconfig A set oftimekeeping/VDSO updates: 2020-08-14 14:26:08 -07:00