[parisc-linux] a pretty big change

[Paul Bame]

Ulrich,

I apologize for suggesting you consider the
r1 value 0xc0112000 by mistake, I meant the r2 value 0xc004a170.
From the r2 and iaoq values, it looks like create_buffers():

create_buffers+4C:              STW             r0,-116(r30)
                LDI             4096,r4
                SUB             r4,r8,r4
                COMIB,>         0,r4,create_buffers+0x00a0
                LDI             0,r3
                ZDEPI           -1,31,16,r5
                BL              get_unused_buffer_head,r2
                OR              r9,r0,r26
                MOVB,=,N        r28,r26,create_buffers+0x00a8	***** %r2
                STW             r3,20(r26)

Just called get_unused_buffer_head, which died on the indicated line:

get_unused_buffer_head+4C:      ADDIL           L%0x73000,r27
                LDO             -1(r20),r20 	; nr_unused_buffer_heads--
                LDW             232(r1),r3	; r3 = bh
                STW             r20,264(r4)	; nr_unused_buffer_heads--
                OR              r3,r0,r28	; return value = r3
                LDW             28(r3),r19	*** died here
                B               get_unused_buffer_head+0x00e0
                STW             r19,232(r1)

Since %r3 is zero at this moment, we die.  I think we are dying trying
to execute 'unused_list = bh->b_next_free;' in get_unused_buffer_head()
with bh = 0.  No idea why.

	-P