linux-kernel - [PATCH 0/3] eldie generated code for folded p4d/pud

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Date:   Wed,  9 Oct 2019 15:26:55 -0700
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     linux-mm@...ck.org
Cc:     linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will@...nel.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nick Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: [PATCH 0/3] eldie generated code for folded p4d/pud

Hi,

This series elides extraneous generate code for folded p4d/pud.
This came up when trying to remove __ARCH_USE_5LEVEL_HACK from ARC port.
The code saving are not a while lot, but still worthwhile IMHO.

bloat-o-meter2 vmlinux-A-baseline vmlinux-E-elide-p?d_clear_bad
add/remove: 0/2 grow/shrink: 0/1 up/down: 0/-146 (-146)
function                                     old     new   delta
p4d_clear_bad                                  2       -      -2
pud_clear_bad                                 20       -     -20
free_pgd_range                               546     422    -124
Total: Before=4137148, After=4137002, chg -1.000000%

Thx,
-Vineet

Vineet Gupta (3):
  asm-generic/tlb: stub out pud_free_tlb() if __PAGETABLE_PUD_FOLDED ...
  asm-generic/tlb: stub out p4d_free_tlb() if __PAGETABLE_P4D_FOLDED ...
  asm-generic/mm: stub out p{4,d}d_clear_bad() if
    __PAGETABLE_P{4,u}D_FOLDED

 include/asm-generic/4level-fixup.h |  2 --
 include/asm-generic/5level-fixup.h |  2 --
 include/asm-generic/pgtable.h      | 11 +++++++++++
 include/asm-generic/tlb.h          |  8 ++++++--
 mm/pgtable-generic.c               |  4 ++++
 5 files changed, 21 insertions(+), 6 deletions(-)

-- 
2.20.1