The patch titled
Subject: asm-generic/tlb: stub out pmd_free_tlb() if nopmd
has been added to the -mm tree. Its filename is
asm-generic-tlb-stub-out-pmd_free_tlb-if-nopmd.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/asm-generic-tlb-stub-out-pmd_free_tlb-if-nopmd.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/asm-generic-tlb-stub-out-pmd_free_tlb-if-nopmd.patch
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------------------------------------------------------
From: Vineet Gupta <Vineet.Gupta1@xxxxxxxxxxxx>
Subject: asm-generic/tlb: stub out pmd_free_tlb() if nopmd
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-E-elide-p?d_clear_bad vmlinux-F-elide-pmd_free_tlb
| add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-112 (-112)
| function old new delta
| free_pgd_range 422 310 -112
| Total: Before=4137042, After=4136930, chg -1.000000%
Note that pmd folding can be tricky: In 2-level setup (where pmd is
conceptually folded) most pmd routines are valid and refer to upper levels.
In this patch we can, but see next patch for example where we can't
Link: http://lkml.kernel.org/r/20191016162400.14796-5-vgupta@xxxxxxxxxxxx
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@xxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
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/pgtable-nopmd.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/include/asm-generic/pgtable-nopmd.h~asm-generic-tlb-stub-out-pmd_free_tlb-if-nopmd
+++ a/include/asm-generic/pgtable-nopmd.h
@@ -60,7 +60,7 @@ static inline pmd_t * pmd_offset(pud_t *
static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
}
-#define __pmd_free_tlb(tlb, x, a) do { } while (0)
+#define pmd_free_tlb(tlb, x, a) do { } while (0)
#undef pmd_addr_end
#define pmd_addr_end(addr, end) (end)
_
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
