The patch titled
Subject: asm-generic/tlb: stub out p4d_free_tlb() if nop4d ...
has been added to the -mm tree. Its filename is
asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d.patch
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------------------------------------------------------
From: Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx>
Subject: asm-generic/tlb: stub out p4d_free_tlb() if nop4d ...
... independent of __ARCH_HAS_5LEVEL_HACK
This came up when removing __ARCH_HAS_5LEVEL_HACK for ARC as code bloat.
With this patch we see the following code reduction
| bloat-o-meter2 vmlinux-C-elide-pud_free_tlb vmlinux-D-elide-p4d_free_tlb
| add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-104 (-104)
| function old new delta
| free_pgd_range 552 422 -130
| Total: Before=4137172, After=4137042, chg -1.000000%
Link: http://lkml.kernel.org/r/20191016162400.14796-4-vgupta@xxxxxxxxxxxx
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-generic/5level-fixup.h | 1 -
include/asm-generic/pgtable-nop4d.h | 2 +-
include/asm-generic/tlb.h | 2 --
3 files changed, 1 insertion(+), 4 deletions(-)
--- a/include/asm-generic/5level-fixup.h~asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d
+++ a/include/asm-generic/5level-fixup.h
@@ -51,7 +51,6 @@ static inline int p4d_present(p4d_t p4d)
#undef p4d_free_tlb
#define p4d_free_tlb(tlb, x, addr) do { } while (0)
#define p4d_free(mm, x) do { } while (0)
-#define __p4d_free_tlb(tlb, x, addr) do { } while (0)
#undef p4d_addr_end
#define p4d_addr_end(addr, end) (end)
--- a/include/asm-generic/pgtable-nop4d.h~asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d
+++ a/include/asm-generic/pgtable-nop4d.h
@@ -50,7 +50,7 @@ static inline p4d_t *p4d_offset(pgd_t *p
*/
#define p4d_alloc_one(mm, address) NULL
#define p4d_free(mm, x) do { } while (0)
-#define __p4d_free_tlb(tlb, x, a) do { } while (0)
+#define p4d_free_tlb(tlb, x, a) do { } while (0)
#undef p4d_addr_end
#define p4d_addr_end(addr, end) (end)
--- a/include/asm-generic/tlb.h~asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d
+++ a/include/asm-generic/tlb.h
@@ -594,7 +594,6 @@ static inline void tlb_end_vma(struct mm
} while (0)
#endif
-#ifndef __ARCH_HAS_5LEVEL_HACK
#ifndef p4d_free_tlb
#define p4d_free_tlb(tlb, pudp, address) \
do { \
@@ -603,7 +602,6 @@ static inline void tlb_end_vma(struct mm
__p4d_free_tlb(tlb, pudp, address); \
} while (0)
#endif
-#endif
#endif /* CONFIG_MMU */
_
Patches currently in -mm which might be from Vineet.Gupta1@xxxxxxxxxxxx are
arc-mm-remove-__arch_use_5level_hack.patch
asm-generic-tlb-stub-out-pud_free_tlb-if-nopud.patch
asm-generic-tlb-stub-out-p4d_free_tlb-if-nop4d.patch
asm-generic-tlb-stub-out-pmd_free_tlb-if-nopmd.patch
asm-generic-mm-stub-out-p4ud_clear_bad-if-__pagetable_p4ud_folded.patch
