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V" , Andrew Morton , Nick Piggin , Peter Zijlstra , "Kirill A . Shutemov" , Vineet Gupta Subject: [PATCH 3/3] asm-generic/mm: stub out p{4,d}d_clear_bad() if __PAGETABLE_P{4,u}D_FOLDED Date: Wed, 9 Oct 2019 15:26:58 -0700 Message-Id: <20191009222658.961-4-vgupta@synopsys.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191009222658.961-1-vgupta@synopsys.com> References: <20191009222658.961-1-vgupta@synopsys.com> MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This removes the code for 2 level paging as seen on ARC | bloat-o-meter2 vmlinux-D-elide-p4d_free_tlb vmlinux-E-elide-p?d_clear_bad | add/remove: 0/2 grow/shrink: 0/0 up/down: 0/-22 (-22) | function old new delta | pud_clear_bad 20 - -20 | p4d_clear_bad 20 - -20 | Total: Before=4137104, After=4137082, chg -1.000000% Signed-off-by: Vineet Gupta --- include/asm-generic/pgtable.h | 11 +++++++++++ mm/pgtable-generic.c | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 818691846c90..9cdcbc7c0b7b 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -558,8 +558,19 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) * Do the tests inline, but report and clear the bad entry in mm/memory.c. */ void pgd_clear_bad(pgd_t *); + +#ifndef __PAGETABLE_P4D_FOLDED void p4d_clear_bad(p4d_t *); +#else +#define p4d_clear_bad(p4d) do { } while (0) +#endif + +#ifndef __PAGETABLE_PUD_FOLDED void pud_clear_bad(pud_t *); +#else +#define pud_clear_bad(p4d) do { } while (0) +#endif + void pmd_clear_bad(pmd_t *); static inline int pgd_none_or_clear_bad(pgd_t *pgd) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 532c29276fce..856dc3bb77e6 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -24,17 +24,21 @@ void pgd_clear_bad(pgd_t *pgd) pgd_clear(pgd); } +#ifndef __PAGETABLE_P4D_FOLDED void p4d_clear_bad(p4d_t *p4d) { p4d_ERROR(*p4d); p4d_clear(p4d); } +#endif +#ifndef __PAGETABLE_PUD_FOLDED void pud_clear_bad(pud_t *pud) { pud_ERROR(*pud); pud_clear(pud); } +#endif void pmd_clear_bad(pmd_t *pmd) {