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Peter Anvin" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Rutland , "Liang, Kan" , Andrew Morton Subject: [PATCH v8 16/20] x86: mm: Point to struct seq_file from struct pg_state Date: Wed, 3 Apr 2019 15:16:23 +0100 Message-Id: <20190403141627.11664-17-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190403141627.11664-1-steven.price@arm.com> References: <20190403141627.11664-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org mm/dump_pagetables.c passes both struct seq_file and struct pg_state down the chain of walk_*_level() functions to be passed to note_page(). Instead place the struct seq_file in struct pg_state and access it from struct pg_state (which is private to this file) in note_page(). Signed-off-by: Steven Price --- arch/x86/mm/dump_pagetables.c | 69 ++++++++++++++++++----------------- 1 file changed, 35 insertions(+), 34 deletions(-) diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c index e2b53db92c34..3d12ac031144 100644 --- a/arch/x86/mm/dump_pagetables.c +++ b/arch/x86/mm/dump_pagetables.c @@ -40,6 +40,7 @@ struct pg_state { bool to_dmesg; bool check_wx; unsigned long wx_pages; + struct seq_file *seq; }; struct addr_marker { @@ -268,11 +269,12 @@ static void note_wx(struct pg_state *st) * of PTE entries; the next one is different so we need to * print what we collected so far. */ -static void note_page(struct seq_file *m, struct pg_state *st, - pgprot_t new_prot, pgprotval_t new_eff, int level) +static void note_page(struct pg_state *st, pgprot_t new_prot, + pgprotval_t new_eff, int level) { pgprotval_t prot, cur, eff; static const char units[] = "BKMGTPE"; + struct seq_file *m = st->seq; /* * If we have a "break" in the series, we need to flush the state that @@ -358,8 +360,8 @@ static inline pgprotval_t effective_prot(pgprotval_t prot1, pgprotval_t prot2) ((prot1 | prot2) & _PAGE_NX); } -static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr, - pgprotval_t eff_in, unsigned long P) +static void walk_pte_level(struct pg_state *st, pmd_t addr, pgprotval_t eff_in, + unsigned long P) { int i; pte_t *pte; @@ -370,7 +372,7 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr, pte = pte_offset_map(&addr, st->current_address); prot = pte_flags(*pte); eff = effective_prot(eff_in, prot); - note_page(m, st, __pgprot(prot), eff, 5); + note_page(st, __pgprot(prot), eff, 5); pte_unmap(pte); } } @@ -383,22 +385,20 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr, * us dozens of seconds (minutes for 5-level config) while checking for * W+X mapping or reading kernel_page_tables debugfs file. */ -static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st, - void *pt) +static inline bool kasan_page_table(struct pg_state *st, void *pt) { if (__pa(pt) == __pa(kasan_early_shadow_pmd) || (pgtable_l5_enabled() && __pa(pt) == __pa(kasan_early_shadow_p4d)) || __pa(pt) == __pa(kasan_early_shadow_pud)) { pgprotval_t prot = pte_flags(kasan_early_shadow_pte[0]); - note_page(m, st, __pgprot(prot), 0, 5); + note_page(st, __pgprot(prot), 0, 5); return true; } return false; } #else -static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st, - void *pt) +static inline bool kasan_page_table(struct pg_state *st, void *pt) { return false; } @@ -406,7 +406,7 @@ static inline bool kasan_page_table(struct seq_file *m, struct pg_state *st, #if PTRS_PER_PMD > 1 -static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr, +static void walk_pmd_level(struct pg_state *st, pud_t addr, pgprotval_t eff_in, unsigned long P) { int i; @@ -420,19 +420,19 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr, prot = pmd_flags(*start); eff = effective_prot(eff_in, prot); if (pmd_large(*start) || !pmd_present(*start)) { - note_page(m, st, __pgprot(prot), eff, 4); - } else if (!kasan_page_table(m, st, pmd_start)) { - walk_pte_level(m, st, *start, eff, + note_page(st, __pgprot(prot), eff, 4); + } else if (!kasan_page_table(st, pmd_start)) { + walk_pte_level(st, *start, eff, P + i * PMD_LEVEL_MULT); } } else - note_page(m, st, __pgprot(0), 0, 4); + note_page(st, __pgprot(0), 0, 4); start++; } } #else -#define walk_pmd_level(m,s,a,e,p) walk_pte_level(m,s,__pmd(pud_val(a)),e,p) +#define walk_pmd_level(s,a,e,p) walk_pte_level(s,__pmd(pud_val(a)),e,p) #undef pud_large #define pud_large(a) pmd_large(__pmd(pud_val(a))) #define pud_none(a) pmd_none(__pmd(pud_val(a))) @@ -440,8 +440,8 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr, #if PTRS_PER_PUD > 1 -static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr, - pgprotval_t eff_in, unsigned long P) +static void walk_pud_level(struct pg_state *st, p4d_t addr, pgprotval_t eff_in, + unsigned long P) { int i; pud_t *start, *pud_start; @@ -455,34 +455,34 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr, prot = pud_flags(*start); eff = effective_prot(eff_in, prot); if (pud_large(*start) || !pud_present(*start)) { - note_page(m, st, __pgprot(prot), eff, 3); - } else if (!kasan_page_table(m, st, pud_start)) { - walk_pmd_level(m, st, *start, eff, + note_page(st, __pgprot(prot), eff, 3); + } else if (!kasan_page_table(st, pud_start)) { + walk_pmd_level(st, *start, eff, P + i * PUD_LEVEL_MULT); } } else - note_page(m, st, __pgprot(0), 0, 3); + note_page(st, __pgprot(0), 0, 3); start++; } } #else -#define walk_pud_level(m,s,a,e,p) walk_pmd_level(m,s,__pud(p4d_val(a)),e,p) +#define walk_pud_level(s,a,e,p) walk_pmd_level(s,__pud(p4d_val(a)),e,p) #undef p4d_large #define p4d_large(a) pud_large(__pud(p4d_val(a))) #define p4d_none(a) pud_none(__pud(p4d_val(a))) #endif -static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr, - pgprotval_t eff_in, unsigned long P) +static void walk_p4d_level(struct pg_state *st, pgd_t addr, pgprotval_t eff_in, + unsigned long P) { int i; p4d_t *start, *p4d_start; pgprotval_t prot, eff; if (PTRS_PER_P4D == 1) - return walk_pud_level(m, st, __p4d(pgd_val(addr)), eff_in, P); + return walk_pud_level(st, __p4d(pgd_val(addr)), eff_in, P); p4d_start = start = (p4d_t *)pgd_page_vaddr(addr); @@ -492,13 +492,13 @@ static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr, prot = p4d_flags(*start); eff = effective_prot(eff_in, prot); if (p4d_large(*start) || !p4d_present(*start)) { - note_page(m, st, __pgprot(prot), eff, 2); - } else if (!kasan_page_table(m, st, p4d_start)) { - walk_pud_level(m, st, *start, eff, + note_page(st, __pgprot(prot), eff, 2); + } else if (!kasan_page_table(st, p4d_start)) { + walk_pud_level(st, *start, eff, P + i * P4D_LEVEL_MULT); } } else - note_page(m, st, __pgprot(0), 0, 2); + note_page(st, __pgprot(0), 0, 2); start++; } @@ -536,6 +536,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd, } st.check_wx = checkwx; + st.seq = m; if (checkwx) st.wx_pages = 0; @@ -549,13 +550,13 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd, eff = prot; #endif if (pgd_large(*start) || !pgd_present(*start)) { - note_page(m, &st, __pgprot(prot), eff, 1); + note_page(&st, __pgprot(prot), eff, 1); } else { - walk_p4d_level(m, &st, *start, eff, + walk_p4d_level(&st, *start, eff, i * PGD_LEVEL_MULT); } } else - note_page(m, &st, __pgprot(0), 0, 1); + note_page(&st, __pgprot(0), 0, 1); cond_resched(); start++; @@ -563,7 +564,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd, /* Flush out the last page */ st.current_address = normalize_addr(PTRS_PER_PGD*PGD_LEVEL_MULT); - note_page(m, &st, __pgprot(0), 0, 0); + note_page(&st, __pgprot(0), 0, 0); if (!checkwx) return; if (st.wx_pages) -- 2.20.1