linux-kernel - [PATCH v4 0/8] powerpc/vdso32 enhancement and optimisation

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Date:   Mon,  2 Dec 2019 07:57:26 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        arnd@...db.de
Subject: [PATCH v4 0/8] powerpc/vdso32 enhancement and optimisation

This series:
- adds getcpu() on non SMP ppc32
- adds coarse clocks in clock_gettime
- fixes and adds all clocks in clock_getres
- optimises the retrieval of the datapage address
- optimises the cache functions

v4:
- Rebased on top of ceb307474506 ("Merge tag 'y2038-cleanups-5.5' of git://git.kernel.org:/pub/scm/linux/kernel/git/arnd/playground")
- Fixed build failure with old binutils reported by mpe (patch 4)

v3:
- Dropped the 'fast syscall' hack for getcpu() on SMP.
- Moved get_datapage macro into asm/vdso_datapage.h so that it can be used on PPC64 as well.

v2:
- Used named labels in patch 2
- Added patch from Vincenzo to fix clock_getres() (patch 3)
- Removed unnecessary label in patch 4 as suggested by Segher
- Added patches 5 to 8

Christophe Leroy (8):
  powerpc/32: Add VDSO version of getcpu on non SMP
  powerpc/vdso32: Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE
  powerpc: Fix vDSO clock_getres()
  powerpc/vdso32: inline __get_datapage()
  powerpc/vdso32: Don't read cache line size from the datapage on PPC32.
  powerpc/vdso32: use LOAD_REG_IMMEDIATE()
  powerpc/vdso32: implement clock_getres entirely
  powerpc/vdso32: miscellaneous optimisations

 arch/powerpc/include/asm/vdso_datapage.h  |  16 +++-
 arch/powerpc/kernel/asm-offsets.c         |   7 +-
 arch/powerpc/kernel/time.c                |   1 +
 arch/powerpc/kernel/vdso.c                |   5 --
 arch/powerpc/kernel/vdso32/Makefile       |   4 +-
 arch/powerpc/kernel/vdso32/cacheflush.S   |  32 ++++++--
 arch/powerpc/kernel/vdso32/datapage.S     |  31 +-------
 arch/powerpc/kernel/vdso32/getcpu.S       |  23 +++++-
 arch/powerpc/kernel/vdso32/gettimeofday.S | 124 +++++++++++++++++++++---------
 arch/powerpc/kernel/vdso32/vdso32.lds.S   |   2 +-
 arch/powerpc/kernel/vdso64/gettimeofday.S |   7 +-
 11 files changed, 164 insertions(+), 88 deletions(-)

-- 
2.13.3