Re: [RFC GIT PULL] hw-breakpoints: Rewrite on top of perf counters

Paul Mackerras
2009-09-10T10:10:05Z

Frederic Weisbecker writes:

> This is a rewrite of the hardware breakpoints on top of perf counters.

On powerpc, it doesn't build. I get:

CC kernel/perf_counter.o
kernel/perf_counter.c:31:31: error: asm/hw_breakpoint.h: No such file or directory
kernel/perf_counter.c: In function 'bp_perf_counter_init':
kernel/perf_counter.c:3964: error: implicit declaration of function 'register_perf_hw_breakpoint'
kernel/perf_counter.c:3966: error: implicit declaration of function '__register_perf_hw_breakpoint'
kernel/perf_counter.c:3968: error: 'perf_ops_bp' undeclared (first use in this function)
kernel/perf_counter.c:3968: error: (Each undeclared identifier is reported only once
kernel/perf_counter.c:3968: error: for each function it appears in.)
make[2]: *** [kernel/perf_counter.o] Error 1
make[1]: *** [kernel] Error 2
make: *** [sub-make] Error 2

Seems like every architecture now needs an asm/hw_breakpoint.h. What
is the minimum required in that file? Looks like we would require a
perf_ops_bp, at least.

Could you please either arrange things so that architectures that
don't have hardware breakpoints hooked up to perf_counters don't need
an asm/hw_breakpoint.h, or add minimal versions of that file for every
architecture, so as not to break bisection unnecessarily?

Paul.