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| author | Vasily Gorbik <gor@linux.ibm.com> | 2020-11-12 17:54:47 +0300 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2020-11-20 21:19:11 +0300 |
| commit | c9343637d6b265127dfe37cd7e09eb6feac03032 (patch) | |
| tree | 939af3da833da49e38d422644893064928ea377a /arch/s390/boot | |
| parent | 73045a08cf5549cc7dee14463431fbeb2134dd67 (diff) | |
| download | linux-c9343637d6b265127dfe37cd7e09eb6feac03032.tar.xz | |
s390/ftrace: assume -mhotpatch or -mrecord-mcount always available
Currently the kernel minimal compiler requirement is gcc 4.9 or
clang 10.0.1.
* gcc -mhotpatch option is supported since 4.8.
* A combination of -pg -mrecord-mcount -mnop-mcount -mfentry flags is
supported since gcc 9 and since clang 10.
Drop support for old -pg function prologues. Which leaves binary
compatible -mhotpatch / -mnop-mcount -mfentry prologues in a form:
brcl 0,0
Which are also do not require initial nop optimization / conversion and
presence of _mcount symbol.
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/boot')
0 files changed, 0 insertions, 0 deletions