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Daniel Borkmann 606c88a86c bpf, x86: detect/optimize loading 0 immediates 
When sometimes structs or variables need to be initialized/'memset' to 0 in
an eBPF C program, the x86 BPF JIT converts this to use immediates. We can
however save a couple of bytes (f.e. even up to 7 bytes on a single emmission
of BPF_LD | BPF_IMM | BPF_DW) in the image by detecting such case and use xor
on the dst register instead.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-12-18 16:04:51 -05:00
..
alpha mm: mlock: add mlock flags to enable VM_LOCKONFAULT usage 2015-11-05 19:34:48 -08:00
arc ARC: dw2 unwind: Remove falllback linear search thru FDE entries 2015-11-23 21:36:49 +05:30
arm Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2015-12-17 11:20:13 -08:00
arm64 bpf: move clearing of A/X into classic to eBPF migration prologue 2015-12-18 16:04:51 -05:00
avr32 dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
blackfin treewide: Remove old email address 2015-11-23 09:44:58 +01:00
c6x irqdomain: Use irq_domain_get_of_node() instead of direct field access 2015-10-13 19:01:23 +02:00
cris cris: Drop reference to get_cmos_time() 2015-11-02 20:03:05 +01:00
frv kmap_atomic_to_page() has no users, remove it 2015-11-09 15:11:24 -08:00
h8300 h8300 update for v4.4 2015-11-12 15:26:39 -08:00
hexagon Linux 4.3-rc4 2015-10-06 17:10:28 +02:00
ia64 [IA64] Enable mlock2 syscall for ia64 2015-12-14 10:30:02 -08:00
m32r Linux 4.3-rc4 2015-10-06 17:10:28 +02:00
m68k m68k: Wire up mlock2 2015-11-22 11:35:26 +01:00
metag Metag architecture changes for v4.4 2015-11-10 16:24:25 -08:00
microblaze Revert "scatterlist: use sg_phys()" 2015-12-15 12:54:06 -08:00
mips MIPS: fix DMA contiguous allocation 2015-12-12 10:15:34 -08:00
mn10300 mn10300: Select CONFIG_HAVE_UID16 to fix build failure 2015-11-30 07:01:40 -08:00
nios2 nios2: fix cache coherency 2015-11-26 22:25:58 +08:00
openrisc dma-mapping: consolidate dma_set_mask 2015-09-10 13:29:01 -07:00
parisc parisc: Disable huge pages on Mako machines 2015-12-12 16:45:23 +01:00
powerpc Revert "powerpc/eeh: Don't unfreeze PHB PE after reset" 2015-12-09 14:05:10 +11:00
s390 bpf: move clearing of A/X into classic to eBPF migration prologue 2015-12-18 16:04:51 -05:00
score Merge branch 'strscpy' of git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile 2015-10-04 16:31:13 +01:00
sh sh64: fix __NR_fgetxattr 2015-12-12 10:15:34 -08:00
sparc treewide: Remove old email address 2015-11-23 09:44:58 +01:00
tile treewide: Remove old email address 2015-11-23 09:44:58 +01:00
um um: fix returns without va_end 2015-12-08 22:26:00 +01:00
unicore32 pwm: Changes for v4.4-rc1 2015-11-11 09:16:10 -08:00
x86 bpf, x86: detect/optimize loading 0 immediates 2015-12-18 16:04:51 -05:00
xtensa Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block 2015-11-10 17:23:49 -08:00
.gitignore
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Kconfig kexec: split kexec_load syscall from kexec core code 2015-09-10 13:29:01 -07:00