[Nouveau] [Bug 71116] [any/all(?) cards below nv50(?)] libdrm built with gcc4.8 causes crashes/lockups during normal operation, and resume from disk/memory

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71116

--- Comment #21 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Compiled code with this patch:

00000000000015b0 <nouveau_pushbuf_reloc>:
    15b0:       55                      push   %rbp
    15b1:       48 8b 6f 30             mov    0x30(%rdi),%rbp
    15b5:       53                      push   %rbx
    15b6:       48 89 fb                mov    %rdi,%rbx
    15b9:       e8 42 ea ff ff          callq  0 <pushbuf_krel>
    15be:       89 45 00                mov    %eax,0x0(%rbp)
    15c1:       48 83 43 30 04          addq   $0x4,0x30(%rbx)
    15c6:       5b                      pop    %rbx
    15c7:       5d                      pop    %rbp
    15c8:       c3                      retq   

Without:
0000000000001650 <nouveau_pushbuf_reloc>:
    1650:       48 89 5c 24 f0          mov    %rbx,-0x10(%rsp)
    1655:       48 89 6c 24 f8          mov    %rbp,-0x8(%rsp)
    165a:       48 83 ec 10             sub    $0x10,%rsp
    165e:       48 8b 6f 30             mov    0x30(%rdi),%rbp
    1662:       48 89 fb                mov    %rdi,%rbx
    1665:       e8 96 e9 ff ff          callq  0 <pushbuf_krel>
    166a:       89 45 00                mov    %eax,0x0(%rbp)
    166d:       48 83 c5 04             add    $0x4,%rbp
    1671:       48 89 6b 30             mov    %rbp,0x30(%rbx)
    1675:       48 8b 1c 24             mov    (%rsp),%rbx
    1679:       48 8b 6c 24 08          mov    0x8(%rsp),%rbp
    167e:       48 83 c4 10             add    $0x10,%rsp
    1682:       c3                      retq   

It seems that the nouveau_pushbuf_reloc difference is harmless. Code is
equivalent, except that without the patch applied it uses another temp variable
causing less optimal code generation.

Remaining candidates: pushbuf_validate, nouveau_pushbuf_data,
nouveau_pushbuf_del.

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