Re: [Crash-utility] Why module's global symbol cannot be displayed in crash? [ARM]
----- Original Message -----
After your fix, the module could show module address now.
However I don't know whether this showing is correct or not...
For while I want to check the module's defined global variant like
below, I just find it is not being mapped yet...
But this variant definition is very straightforward, like:
int cctdev_major = 0;
crash> sym cctdev_major
bf16564d (B) cctdev_major
crash> vtop -k bf16564d
VIRTUAL PHYSICAL
bf16564d (not mapped)
PAGE DIRECTORY: c0004000
PGD: c0006fc4 => 1f3cdc11
PMD: c0006fc4 => 1f3cdc11
PTE: 1f3cd594 => 0
I don't know what is going wrong there, and I am planning to manually
print out symbols' address before trigger the dump, and to see
whether they could be aligned.
Do you have some better idea how to fix it?...
No, not really, I'm not an ARM guy...
But it's possible/probable that the "vtop" translation on kernel module
virtual (vmalloc) addresses may not be working correctly. I also noted
yesterday that "vtop" on user-space virtual addresses fails pretty miserably
most of the time. Both arm_kvtop() and arm_uvtop() both end up calling the
common arm_vtop() function, so I'm guessing that it's the culprit.
Dave