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| author | Dave Airlie <airlied@redhat.com> | 2019-04-15 15:51:49 +1000 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2019-04-15 15:51:49 +1000 |
| commit | f06ddb53096b4cddad2c530125a78a3c2a1d28a4 (patch) | |
| tree | 36a05922af22272dc82357ce82be21a3a9214bd0 /arch/powerpc/lib/memcmp_64.S | |
| parent | ecc4946f11a07884f230450a6d5a92337bc21375 (diff) | |
| parent | dc4060a5dc2557e6b5aa813bf5b73677299d62d2 (diff) | |
BackMerge v5.1-rc5 into drm-next
Need rc5 for udl fix to add udl cleanups on top.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'arch/powerpc/lib/memcmp_64.S')
| -rw-r--r-- | arch/powerpc/lib/memcmp_64.S | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/arch/powerpc/lib/memcmp_64.S b/arch/powerpc/lib/memcmp_64.S index 844d8e774492..b7f6f6e0b6e8 100644 --- a/arch/powerpc/lib/memcmp_64.S +++ b/arch/powerpc/lib/memcmp_64.S @@ -215,11 +215,20 @@ _GLOBAL_TOC(memcmp) beq .Lzero .Lcmp_rest_lt8bytes: - /* Here we have only less than 8 bytes to compare with. at least s1 - * Address is aligned with 8 bytes. - * The next double words are load and shift right with appropriate - * bits. + /* + * Here we have less than 8 bytes to compare. At least s1 is aligned to + * 8 bytes, but s2 may not be. We must make sure s2 + 7 doesn't cross a + * page boundary, otherwise we might read past the end of the buffer and + * trigger a page fault. We use 4K as the conservative minimum page + * size. If we detect that case we go to the byte-by-byte loop. + * + * Otherwise the next double word is loaded from s1 and s2, and shifted + * right to compare the appropriate bits. */ + clrldi r6,r4,(64-12) // r6 = r4 & 0xfff + cmpdi r6,0xff8 + bgt .Lshort + subfic r6,r5,8 slwi r6,r6,3 LD rA,0,r3 |