Latest working kernel version: 2.6.28.8
Earliest failing kernel version: 2.6.29
Distribution: any
Hardware Environment: any
Software Environment:
Problem Description: enabling TRACE_BRANCH_PROFILING in .config triggers so much sparse warnings that the sparse output becomes unusable.

Steps to reproduce:
* enable CONFIG_TRACE_BRANCH_PROFILING (I enabled this through make allyesconfig)
* run make C=2

Result: a huge number of sparse warnings, e.g.
...
include/linux/cpumask.h:547:2: warning: symbol '______r' shadows an earlier one
include/linux/cpumask.h:547:2: originally declared here
...
/tmp/bva/linux-2.6.29/arch/x86/include/asm/paravirt.h:902:2: warning: symbol '______r' shadows an earlier one
/tmp/bva/linux-2.6.29/arch/x86/include/asm/paravirt.h:902:2: originally declared
here
/tmp/bva/linux-2.6.29/arch/x86/include/asm/paravirt.h:902:2: warning: too many warnings
...

Proposed fix: in include/compiler.h, change

#if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING)

into

#if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING) && ! defined(__CHECKER__)