[PATCH V2 00/11] Subject: Remove duplicated kmap code

ira.weiny
2020-05-04T01:10:06Z

From: Ira Weiny <ira.weiny@intel.com>

The kmap infrastructure has been copied almost verbatim to every architecture.
This series consolidates obvious duplicated code by defining core functions
which call into the architectures only when needed.

Some of the k[un]map_atomic() implementations have some similarities but the
similarities were not sufficient to warrant further changes.

In addition we remove a duplicate implementation of kmap() in DRM.

Testing was done by 0day to cover all the architectures I can't readily
build/test.

---
Changes from V1:
Fix bisect-ability
Update commit message and fix line lengths
Remove unneded kunmap_atomic_high() declarations
Remove unneded kmap_atomic_high() declarations
collect reviews
rebase to 5.7-rc4

Changes from V0:
Define kmap_flush_tlb() and make kmap() truely arch independent.
Redefine the k[un]map_atomic_* code to call into the architectures for
high mem pages
Ensure all architectures define kmap_prot, use it appropriately, and
define kmap_atomic_prot()
Remove drm implementation of kmap_atomic()

Ira Weiny (11):
arch/kmap: Remove BUG_ON()
arch/xtensa: Move kmap build bug out of the way
arch/kmap: Remove redundant arch specific kmaps
arch/kunmap: Remove duplicate kunmap implementations
{x86,powerpc,microblaze}/kmap: Move preempt disable
arch/kmap_atomic: Consolidate duplicate code
arch/kunmap_atomic: Consolidate duplicate code
arch/kmap: Ensure kmap_prot visibility
arch/kmap: Don't hard code kmap_prot values
arch/kmap: Define kmap_atomic_prot() for all arch's
drm: Remove drm specific kmap_atomic code

arch/arc/include/asm/highmem.h | 15 -------
arch/arc/mm/highmem.c | 28 +++---------
arch/arm/include/asm/highmem.h | 7 ---
arch/arm/mm/highmem.c | 35 +++------------
arch/csky/include/asm/highmem.h | 9 +---
arch/csky/mm/highmem.c | 43 +++++--------------
arch/microblaze/include/asm/highmem.h | 28 +-----------
arch/microblaze/mm/highmem.c | 16 ++-----
arch/microblaze/mm/init.c | 3 --
arch/mips/include/asm/highmem.h | 9 +---
arch/mips/mm/cache.c | 6 +--
arch/mips/mm/highmem.c | 49 ++++-----------------
arch/nds32/include/asm/highmem.h | 7 ---
arch/nds32/mm/highmem.c | 39 +++--------------
arch/parisc/include/asm/cacheflush.h | 4 +-
arch/powerpc/include/asm/highmem.h | 29 +------------
arch/powerpc/mm/highmem.c | 21 ++-------
arch/powerpc/mm/mem.c | 3 --
arch/sparc/include/asm/highmem.h | 22 ----------
arch/sparc/mm/highmem.c | 18 +++-----
arch/x86/include/asm/highmem.h | 9 ----
arch/x86/mm/highmem_32.c | 50 ++-------------------
arch/xtensa/include/asm/highmem.h | 27 ------------
arch/xtensa/mm/highmem.c | 22 ++++------
drivers/gpu/drm/ttm/ttm_bo_util.c | 56 ++----------------------
drivers/gpu/drm/vmwgfx/vmwgfx_blit.c | 16 +++----
include/drm/ttm/ttm_bo_api.h | 4 --
include/linux/highmem.h | 62 +++++++++++++++++++++++++--
28 files changed, 140 insertions(+), 497 deletions(-)

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