On Thu, 18 Oct 2018 10:51:18 +0530 Sai Prakash Ranjan <saiprakash.ranjan@xxxxxxxxxxxxxx> wrote: > > So something else is causing an issue besides just msm_read. > > > > Can you do an objdump -dr of the entire vmlinux binary and gzip it and > > post it somewhere. Not sure if it would be too big to email. You could > > try sending it to me privately. I'd like to see the binary that you are > > using. > > > > I have sent the objdump and dot config to you privately. Thanks. I don't see anything that pops out, but then again, my arm asm foo is very rusty (it has been literally decades since I did any arm asm). I wonder if it could simply be a timing issue? ffff0000086eb538 <msm_read.isra.1>: ffff0000086eb538: a9be7bfd stp x29, x30, [sp,#-32]! ffff0000086eb53c: 910003fd mov x29, sp ffff0000086eb540: a90153f3 stp x19, x20, [sp,#16] ffff0000086eb544: aa0003f4 mov x20, x0 ffff0000086eb548: 2a0103f3 mov w19, w1 ffff0000086eb54c: aa1e03e0 mov x0, x30 ffff0000086eb550: 97e6bae4 bl ffff00000809a0e0 <_mcount> The above is changed to nop on boot, but then to: bl ftrace_caller When ftrace is enabled. ffff0000086eb554: 8b334280 add x0, x20, w19, uxtw ffff0000086eb558: b9400000 ldr w0, [x0] ffff0000086eb55c: a94153f3 ldp x19, x20, [sp,#16] ffff0000086eb560: a8c27bfd ldp x29, x30, [sp],#32 ffff0000086eb564: d65f03c0 ret ffff00000809a0e4 <ftrace_caller>: ffff00000809a0e4: a9bf7bfd stp x29, x30, [sp,#-16]! ffff00000809a0e8: 910003fd mov x29, sp ffff00000809a0ec: d10013c0 sub x0, x30, #0x4 ffff00000809a0f0: f94003a1 ldr x1, [x29] ffff00000809a0f4: f9400421 ldr x1, [x1,#8] ffff00000809a0f8: d1001021 sub x1, x1, #0x4 ffff00000809a0fc <ftrace_call>: ffff00000809a0fc: d503201f nop The above nop gets patched to: bl ftrace_ops_no_ops Which will iterate through all the registered functions. ffff00000809a100 <ftrace_graph_call>: ffff00000809a100: d503201f nop The above only gets set when function graph tracer is enabled, which it is not in this case. ffff00000809a104: a8c17bfd ldp x29, x30, [sp],#16 ffff00000809a108: d65f03c0 ret Anyone see any problems here? -- Steve
