diff options
| author | Vasily Gorbik <gor@linux.ibm.com> | 2022-02-25 00:43:31 +0300 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2022-03-10 17:58:17 +0300 |
| commit | 4efd417f298bc23bc8b6ac5db5ff79af5ec92ac5 (patch) | |
| tree | 41b6781eadef63b049d3c16fa5119f665c80f7a0 /arch/s390/include/asm/timex.h | |
| parent | 432b1cc78e985d3c783f1accb2507fbf5a87583d (diff) | |
| download | linux-4efd417f298bc23bc8b6ac5db5ff79af5ec92ac5.tar.xz | |
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/include/asm/timex.h')
| -rw-r--r-- | arch/s390/include/asm/timex.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h index 50d9b04ecbd1..ca9a8ab1261a 100644 --- a/arch/s390/include/asm/timex.h +++ b/arch/s390/include/asm/timex.h @@ -187,14 +187,10 @@ static inline unsigned long get_tod_clock(void) static inline unsigned long get_tod_clock_fast(void) { -#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES unsigned long clk; asm volatile("stckf %0" : "=Q" (clk) : : "cc"); return clk; -#else - return get_tod_clock(); -#endif } static inline cycles_t get_cycles(void) |