Bug 9170 - undefined reference to `cpu_tlb' if used -O0
Summary: undefined reference to `cpu_tlb' if used -O0
Status: REJECTED INVALID
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: ARM (show other bugs)
Hardware: All Linux
: P1 low
Assignee: Russell King
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2007-10-15 23:56 UTC by liuyj
Modified: 2007-10-16 07:56 UTC (History)
0 users

See Also:
Kernel Version: 2.6.22
Subsystem:
Regression: ---
Bisected commit-id:

Attachments
Add an attachment (proposed patch, testcase, etc.)

Description liuyj 2007-10-15 23:56:44 UTC 
Most recent kernel where this bug did not occur:
Distribution:
Hardware Environment:
Software Environment:
Problem Description:

Steps to reproduce:

in "Linux/include/asm-arm/tlbflush.h" line:186 188
the  "cpu_tlb" should in "#ifdef MULTI_TLB  ... #endif"
in this file and those include it, unuse the "cpu_tlb". 
result : if use -O0 will occurs undefined reference to `cpu_tlb' ,
    but use -Os or -O2 will not occurs.
Comment 1 Russell King 2007-10-16 00:25:45 UTC 
The Linux kernel relies upon having an optimising compiler.  -O0 results
in no optimisation.  Always use at least -O1.
Comment 2 Randy Dunlap 2007-10-16 07:56:38 UTC 
In my experience, many problems arise when trying to use -O0.  Closed.
Note You need to log in before you can comment on or make changes to this bug.