linux-toradex.git/arch/s390/kernel/perf_regs.c, branch v6.7

perf/arch: Remove perf_sample_data::regs_user_copy

2020-11-09T17:12:34+00:00

struct perf_sample_data lives on-stack, we should be careful about it's
size. Furthermore, the pt_regs copy in there is only because x86_64 is a
trainwreck, solve it differently.

Reported-by: Thomas Gleixner 
Signed-off-by: Peter Zijlstra (Intel) 
Tested-by: Steven Rostedt 
Link: https://lkml.kernel.org/r/20201030151955.258178461@infradead.org

s390/perf: fix gcc 8 array-bounds warning

2018-07-02T09:24:54+00:00

arch/s390/kernel/perf_regs.c:36:19: warning: array subscript 16 is above
array bounds of 'long unsigned int[16]' [-Warray-bounds]
  return regs->gprs[idx];

gcc tries to be smart here and since there is a condition:
if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
	return regs->gprs[idx];
which covers all possible array subscripts, it gives the warning
for the last function return statement:
	return regs->gprs[idx];
which in presence of that condition does not really make sense and
should be replaced with "return 0;"

Also move WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX) to the end of the
function.

Reviewed-by: Hendrik Brueckner 
Signed-off-by: Vasily Gorbik 
Signed-off-by: Martin Schwidefsky

s390: add a few more SPDX identifiers

2017-12-05T06:51:09+00:00

Add the correct SPDX license to a few more files under arch/s390 and
drivers/s390 which have been missed to far.
The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.

Signed-off-by: Martin Schwidefsky

s390/perf: extend perf_regs support to include floating-point registers

2017-11-16T14:06:14+00:00

Extend the perf register support to also export floating-point register
contents for user space tasks.  Floating-point registers might be used
in leaf functions to contain the return address.  Hence, they are required
for proper DWARF unwinding.

Signed-off-by: Hendrik Brueckner 
Reviewed-and-tested-by: Thomas Richter 
Signed-off-by: Martin Schwidefsky

s390/perf: add perf_regs support and user stack dump

2017-11-16T14:06:11+00:00

Add s390 support to dump user stack to user space for DWARF
stack unwinding.

Signed-off-by: Heiko Carstens 
Reviewed-by: Hendrik Brueckner 
Reviewed-and-tested-by: Thomas Richter 
Signed-off-by: Martin Schwidefsky