diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2022-02-24 22:43:31 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2022-03-10 15:58:17 +0100 |
| commit | 4efd417f298bc23bc8b6ac5db5ff79af5ec92ac5 (patch) | |
| tree | 41b6781eadef63b049d3c16fa5119f665c80f7a0 /arch/s390/kernel/mcount.S | |
| parent | 432b1cc78e985d3c783f1accb2507fbf5a87583d (diff) | |
s390: raise minimum supported machine generation to z10
Machine generations up to z9 (released in May 2006) have been officially
out of service for several years now (z9 end of service - January 31, 2019).
No distributions build kernels supporting those old machine generations
anymore, except Debian, which seems to pick the oldest supported
generation. The team supporting Debian on s390 has been notified about
the change.
Raising minimum supported machine generation to z10 helps to reduce
maintenance cost and effectively remove code, which is not getting
enough testing coverage due to lack of older hardware and distributions
support. Besides that this unblocks some optimization opportunities and
allows to use wider instruction set in asm files for future features
implementation. Due to this change spectre mitigation and usercopy
implementations could be drastically simplified and many newer instructions
could be converted from ".insn" encoding to instruction names.
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/mcount.S')
| -rw-r--r-- | arch/s390/kernel/mcount.S | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/s390/kernel/mcount.S b/arch/s390/kernel/mcount.S index 6ace43d7e8d2..1326927a17b5 100644 --- a/arch/s390/kernel/mcount.S +++ b/arch/s390/kernel/mcount.S @@ -35,14 +35,8 @@ ENDPROC(ftrace_stub) .if \allregs == 1 # save psw mask # don't put any instructions clobbering CC before this point -#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES epsw %r1,%r14 risbg %r14,%r1,0,31,32 -#else - epsw %r14,%r1 - sllg %r14,%r14,32 - lr %r14,%r1 -#endif .endif lgr %r1,%r15 @@ -58,12 +52,7 @@ ENDPROC(ftrace_stub) .if \allregs == 1 stg %r14,(STACK_PTREGS_PSW)(%r15) -#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES mvghi STACK_PTREGS_FLAGS(%r15),_PIF_FTRACE_FULL_REGS -#else - lghi %r14,_PIF_FTRACE_FULL_REGS - stg %r14,STACK_PTREGS_FLAGS(%r15) -#endif .else xc STACK_PTREGS_FLAGS(8,%r15),STACK_PTREGS_FLAGS(%r15) .endif |