linux-dev/arch/s390/kernel/perf_regs.c, branch linus/master

perf/arch: Remove perf_sample_data::regs_user_copy

2020-11-09T17:12:34Z

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

2018-07-02T09:24:54Z

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

2017-12-05T06:51:09Z

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

2017-11-16T14:06:14Z

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

2017-11-16T14:06:11Z

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